... Accession Number : AD0196177. Title : PARTICLE ACCELERATORS AS NEUTRON SOURCES FOR NEUTRON RADIOGRAPHS. ...

Table sugar samples were irradiated with accelerated carbon ions and fast neutrons. Electron paramagnetic resonance (EPR) analysis performed after the irradiation revealed a complex spectrum similar to that observed after gamma-ray irradiations. The total concentration of the paramagnetic centers induced by ...

The Radiological Research Accelerator Facility (RARAF) is based on a 4-MV Van de Graaff accelerator, which is used to generate a variety of well-characterized radiation beams for research in radiobiology and radiological physics. The experiments run at RARAF are described, and center on neutron dosimetry, mutagenesis, and ...

PhoNeS (Photo Neutron Source) is an INFN project devoted to the optimization of the neutron production and moderation in radiotherapy linear accelerators. LinAcs producing high energy (15 25 MeV) photon beams are becoming widespread. At this energy neutron photo-production is unavoidable and the ...

Cosmic rauon induced neutrons are a major source of background for low count rate experiments like neutrino oscillation or dark matter searches. Especially at shallow sites these neutrons are the limiting factor for the ultimate sensitivity of the measurement. Measurements of the neutron rate and counter measures ...

Prompt-fission-neutron multiplicities were measured at a ``white'' neutron source for the fission of 238U and 235U up to 200 MeV. The data are of great importance in the connection of accelerator-coupled nuclear-reactor systems incinerating actinides, with uranium considered as a prototype actinide. We report that the fission ...

The differential dieaway time technique developed by Los Alamos National Laboratory (LANL) is a very useful development for active interrogation nondestructive assay. Prompt neutrons from accelerator-neutron-induced fission provide the fissile assay respo...

... ACCELERATORS, NEUTRON FLUX), NEUTRON ... REACTIONS, REACTOR CORES, ELECTRON ... ELECTRON IRRADIATION, MEASUREMENT. ...

The production of photoneutrons by electron accelerators is an unavoidable process at operating energies above about 10 MeV. These photoneutrons create problems in shielding, personnel protection, and induced radioactivity. This paper attempts to describe...

Simultaneous photon and neutron interrogation from electron linear accelerator pulses is used as the basis for a unique assay technique for transuranics. Both prompt and delayed neutrons from the induced fissions are counted on a single detection system, and the contributions from each interrogating flux are ...

... warfare, joint planning, national and international ... tube ion accelerator as neutron ... TUBES, ION ACCELERATORS, MAINTENANCE EQUIPMENT ...

Differential cross sections for the neutron-induced gamma-ray production from natural vanadium have been measured for incident neutron energies between 0.2 and 20.0 MeV. The Oak Ridge Linear Accelerator (ORELA) was used to provide the neutrons and a NaI s...

Differential cross sections for the neutron-induced gamma-ray production from sodium were measured for incident neutron energies between 0.2 and 20.0 MeV. The Oak Ridge Electron Linear Accelerator (ORELA) was used to provide the neutrons and a NaI spectro...

Accelerator-based neutron sources are an attractive alternative to nuclear reactors for providing epithermal neutron beams for Boron Neutron Capture Therapy. Based on clinical requirements and neutronics modeling the use of proton and deuteron induced reactions in {sup 7}Li ...

At the Oak Ridge Electron Linear Accelerator (OREEA) used as a pulse neutron source with a nominal resolution of 0.10 ns/m, a time-of-flight technique was set up to undertake a high resolution measurement of the neutron induced fission cross section of ex...

Prompt-fission-neutron multiplicities were measured at a 'white' neutron source for the fission of {sup 238}U and {sup 235}U up to 200 MeV. The data are of great importance in the connection of accelerator-coupled nuclear reactor systems incinerating actinides, with uranium considered as a prototype actinide. We ...

The production of photoneutrons by electron accelerators is an unavoidable process at operating energies above about 10 MeV. These photoneutrons create problems in shielding, personnel protection, and induced radioactivity. This paper attempts to describe the neutron field spectral and intensity distributions. The initial spectrum and ...

A procedure for the determination of neutron-induced photon production cross sections is described, including corrections for the neutron-induced photon background and the unfolding of the gamma-ray spectra. As an example, data have been obtained for tantalum and beryllium with five bismuth germanate detectors and the high-energy white ...

Recent interest in the production of epithermal neutrons for use in boron neutron capture therapy (BNCT) has prompted an investigation into the feasibility of generating such neutrons with a tandem cascade accelerator. Accelerator-produced neutrons in the...

Fission neutron spectra from neutron induced fission in 235U and 239Pu for energies below that of the neutron inducing fission have been measured. The spectra were obtained for 1.5 MeV and 2.5 MeV incident neutrons. Previous accelerator-based fission ...

An important international effort is devoted to find a suitable solution to incinerate radioactive nuclear waste issued from conventional power plants and from nuclear disarmament. Practically all innovative projects consist of a sub critical system driven by an external neutron source obtained by spallation induced by a high intensity proton ...

A study of the properties of the neutron production target for the China accelerator-driven system induced from 150-MeV incident proton energy and a 3-mA beam current is performed. The selection of the material and geometry design for the target; the physics properties of the target involved in this work including the ...

A wide programme on neutron-induced data for various applications is running at the 20-180 MeV neutron beam facility at the The Svedberg Laboratory, Uppsala. The main research areas are nuclear data for accelerator-driven transmutation of nuclear waste, single-event effects, and dose effects in fast-neutron cancer ...

A wide programme on neutron-induced data for various applications is running at the 20-180 MeV neutron beam facility at the The Svedberg Laboratory, Uppsala. The main research areas are nuclear data for accelerator-driven transmutation of nuclear waste, single-event effects, and dose effects in fast-neutron cancer ...

An original experiment was performed to measure the angular correlation of fission neutrons from thermal -neutron-induced fission of ('235)U, with respect to the light fission fragment direction, as a function of fragment mass division and neutron energy. A Monte Carlo model, with a realistic description of the fission fragment de ...

Laser plasma acceleration of ions is a rapidly evolving field, mainly due to the potential applications in oncology by proton therapy, astrophysics and neutron production for radiography. Here we present the details of an experimental investigation of ion acceleration from the rear of a metal foil in which both the ...

Delayed-neutron (DN) energy spectra following thermal neutron induced fission of /sup 239/Pu as a function of time after fission have been measured, using the beta-neutron time-of-flight (TOF) spectrometer at the University of Lowell. Thermal/epithermal neutrons were produced on the 5.5-MV Van ...

Fission neutron spectra from neutron induced fission in 235U and 239Pu for energies below that of the neutron inducing fission have been measured. The spectra were obtained for 1.5 MeV and 2.5 MeV incident neutrons. Previous accelerator-based fission ...

We have used the Oak Ridge Electron Linear Accelerator (ORELA) to measure neutron total and the fission cross sections of ²³³U in the energy range from 0.36 eV to ~700 keV. We report average fission and total cross sections. Also, we measured the neutron total cross sections of ²⁷Al and ...

The ratio of the exp 241 Pu to exp 235 U neutron-induced fission cross sections was measured with fission ionization chambers at the LLL 100-MeV electron linear accelerator. The time-of-flight technique was used to measure the cross section ratio as a fun...

The ratio of the neutron-induced fission cross sections of exp 241 Pu relative to that of exp 235 U was measured with fission ionization chambers at the LLL 100-MeV electron linear accelerator. The time-of-flight technique was used to measure the cross-se...

This paper brings into focus the instrumentation needs of future demonstration-scale coal conversion and combustion plants which may be met with new instrumentation based on neutron-induced gamma techniques. Progress in automated multielement analysis of ...

Mutagenesis by densely ionizing radiation represents a significant long-term hazard to the individual. Few data are available to describe the dose-response aspect of mutation induction by either accelerated charged particles or fission spectrum neutrons i...

This contribution investigates the formation of radioactive elements which may be produced by the interaction of high-energy particles, thermal neutrons and gamma particles on the one hand, and the components of air within the tunnel of the 300 GeV proton...

Soft error rate (SER) testing of devices have been performed using the neutron beam at the Radiation Science and Engineering Center at Penn State University. The soft error susceptibility for different memory chips working at different technology nodes and operating voltages is determined. The effect of 10B on SER as an in situ excess charge source is observed. The effect of ...

We have developed a thermal-neutron coded-aperture imager that reveals the locations of hydrogenous materials from which thermal neutrons are being emitted. This imaging detector can be combined with an accelerator to form an active interrogation system in which fast neutrons are produced in a heavy metal target by ...

... FAST NEUTRONS, RADIATION HAZARDS, RADIATION MONITORS, PARTICLE ACCELERATORS, NEUTRON FLUX, NEUTRON COUNTERS. ...

This paper reviews existing models for radiation-induced segregation to microstructural interfaces and surfaces. It indicates how the models have been successfully used in the past in neutron irradiation situations and how they may be modified to account for accelerator-driven RIS. The predictions of the models suggest that any ...

This work demonstrates the use of pyroelectric crystals to induce nuclear reactions. A system based on a pair of pyroelectric crystals is used to ionize gas and accelerate the ions to energies of up to 200 keV. The system operates above room temperature by simply heating or cooling the pyroelectric crystals. A D-D fusion reaction was achieved with this ...

In the field of accelerator development, medium-energy reaction cross-section data for structural materials of accelerator and shielding components are required, especially for radiation protection purposes. For a d + Li stripping reaction neutron source used in materials research, neutron reaction cross sections ...

A description is given of a lead slowing-down spectrometer (LSDS) installed at the 800-MeV proton accelerator of the Los Alamos Neutron Science Center (LANSCE). The LSDS is designed to study neutron-induced fission on actinides that can only be obtained or used in small quantities. The characteristics of this LSDS (energy time ...

GEANIE is a multi-detector, high-resolution gamma-ray spectrometer that is operated as a collaborative effort between Lawrence Livermore National Laboratory and Los Alamos National Laboratory. The WNR high-energy spallation neutron source at the Los Alamos Neutron Science Center (LANSCE) provides GEANIE's beam. GEANIE enables new measurements of ...

Tritium contamination reduction in small ion accelerators for neutron production, discussing pumping

Simultaneous photon and neutron interrogation of samples for the quantitative determination of total fissile nuclide and total fertile nuclide material present is made possible by the use of an electron accelerator. Prompt and delayed neutrons produced from resulting induced fissions are counted using a single ...

The use of threshold detector foils to measure the external neutron spectrum of the Livermore Pool Type Reactor and the KEWB Reactor is described. The foils employed are Pu/sup 239/ to measure the total fast flux, U/sup 238/for the region above l.5 Mev, S/sup 32/ above 2.5 Mev, and Au/sup 197/ for thermal neutrons. Scintillation counters are used ...

The scattering of thermal neutrons from isomeric nuclei may include events in which the outgoing neutrons have increased kinetic energy. This process has been called inelastic neutron acceleration, or INNA, and occurs when the final nucleus, after emission of the neutron, is left in a state ...

We have developed a thermal-neutron coded-aperture imager that reveals the locations of hydrogenous materials from which thermal neutrons are being emitted. This imaging detector can be combined with an accelerator to form an active interrogation system in which fast neutrons are produced in a heavy metal target by ...

Strong fields of bremsstrahlung photons and photoneutrons are produced during the operation of high-energy electron linacs. Therefore, a mixed gamma and neutron radiation field dominates the accelerators environment. The gamma radiation induced Total Ionizing Dose (TID) effect manifests the long-term deterioration of the electronic ...

Oak Ridge National Laboratory Physics Division The Oak Ridge Electron Linear Accelerator Pulsed Neutron Source The ORELA is a powerful electron accelerator-based neutron source...

... BY NEUTRON CAPTURE IN TANTALUM DEVICES HAS BEEN ... RESULTING FROM NEUTRON CAPTURE IN ... AND INCIDENT NEUTRONS IN THE ...

The impact of a laser-accelerated micron-size projectile on a dense plasma target is studied using two-dimensional particle-in-cell simulations. The projectile is first accelerated by an ultraintense laser. It then impinges on the dense plasma target and merges with the latter. Part of the kinetic energy of the laser-accelerated ions ...

Los Alamos National Laboratory (LANL) is home to the Los Alamos Neutron Science Center (LANSCE). LANSCE is a unique facility because its neutron spectrum closely mimics the neutron spectrum at terrestrial and aircraft altitudes, but is many times more intense. Thus, LANSCE provides an ideal setting for accelerated ...

Several of the neutron scattering instruments at the Intense Pulsed Neutron Source (IPNS) at Argonne use neutron choppers for monochromatization of the neutron beam. Since the neutron burst is produced by a proton beam extracted from the Rapid Cycling Syn...

We are developing a new active interrogation system based on a kinematically focused low energy neutron beam. The key idea is that one of the defining characteristics of SNM (Special Nuclear Materials) is the ability for low energy or thermal neutrons to induce fission. Thus by using low energy neutrons for the ...

. Scott. The design and testing high power lithium target for accelerator-based boron neutron capture therapy. Research and Development in Neutron Capture Therapy, Eds.: W. Sauerwein, R. Moss, and A. Wittig . - , , . , . [1] B. Bayanov, et al. Accelerator based neutron source for the ...

Soft errors have become a serious problem in very large scale integrated circuit (VLSI) circuits. Although the accurate estimations of neutron- and ?-induced soft error rates (SERs) are essential, the magnitude relationship between neutron- and ?-induced SERs has long been unclear. Recently, a sensitive dosimetry ...

The gamma field accompanying neutrons may, in certain circumstances, play an important role in the analysis of neutron dosimetry and even in the interpretation of radiation induced steel embrittlement. At the High Flux Isotope Reactor pressure vessel the gamma induced reactions dominate the responses of {sup 237}Np ...

As a result of stripping of deuterons accelerated in the JINR proton synchrotron a beam of neutrons was formed with regulated momentum and stabilized intensity. The neutron port was formed in such a manner as to use the stripping neutrons emitted at the a...

Additional evaluation of deuteron induced activation of gold and aluminum was done to provide dose estimates. An evaluation was made of the neutron environment at large angles to the 35 MeV deuteron beam in the FMIT test cell for comparison with positions at small angles to a 20 MeV beam. Predictions of the neutron source ...

High-energy therapeutic beams used in the radiotherapy induce photonuclear and electronuclear reactions which are accompanied by generation of undesirable radioisotopes and neutrons inside the treatment room. These neutrons at thermal and resonance energies induce nuclear reactions through the whole ...

The results of exp 14 C induced transfer reactions performed with the Orsay MP Tandem accelerator on neutron rich targets nuclei exp 64 Ni, exp 70 Zn and exp 76 Ge are given. Two proton pick-up were measured ( exp 14 C, exp 16 O) as well as the next trans...

This paper presents a new technique for the measurement of fissile and fertile nuclear materials in spent fuel and plutonium laden materials such as mixed oxide (MOX) fuel. The technique, called differential die-away self-interrogation, is similar to traditional differential die-away analysis, but it does not require a pulsed neutron generator or pulsed beam ...

This paper presents a new technique for the measurement of fissile and fertile nuclear materials in spent fuel and plutonium-laden materials such as mixed oxide (MOX) fuel. The technique, called differential die-away self-interrogation, is similar to traditional differential die-away analysis, but it does not require a pulsed neutron generator or pulsed beam ...

The high sensitivity of the accelerator mass spectrometry (AMS) method has been utilized to measure the extremely low yields for super asymmetric neutron-induced fission of uranium. From a high level radioactive waste concentrate (HAWC) of the reprocessing plant WAK in Karlsruhe, Germany, iron has been chemically extracted and investigated by means of AMS ...

Dose measurements and radiation transport calculations were investigated for the interactions within the human brain of fast neutrons, slow neutrons, thermal neutrons, and photons associated with accelerator-based boron neutron capture therapy (ABNCT). To estimate the overall dose to the human ...

During the period August 1, 1991 to July 31, 1994 the authors report progress on the following: (a) prompt fission neutron energy spectra for {sup 235}U and {sup 239}Pu; (b) two-parameter measurement of nuclear lifetimes; (c) `black` neutron detector; (d) data reduction techniques for neutron scattering experiments; (e) elastic and ...

In order to anticipate problems from the radioactivation of neutral beam sources as a result of testing, a code has been developed which calculates both the radioactivities produced and the dose rates resulting therefrom. The code ACDOS2 requires neutron source strength and spectral distribution as input, or alternately, the source strength can be calculated internally from an ...

The CaWO4 detectors of CRESST are able to distinguish electron recoils as induced by ionizing radiation from nuclear recoils as expected from heavy dark matter particles (WIMPs) thanks to the coincident measurement of the phonon and scintillation light signals produced in an event. For a detailed understanding of the detector response to nuclear recoils, especially the light ...

Measurements were made of the cross section for /sup 242/Am/sup m/ fission induced by neutrons in the energy range 0.04< or =E/sub n/< or =4.52 MeV as well as by neutrons with E/sub n/roughly-equal14.8 MeV. An electrostatic generator and a low-voltage accelerating tube were used to generate the ...

A series of experiments has been performed to measure prompt neutron angular and energy distributions from thermal neutron-induced fission of 235,233U in correlation with the fission fragments. These distributions have been analyzed with the assumption of neutron isotropic emission from accelerated fission ...

Delayed neutrons (DN) play an important role in nuclear reactor physics. Innovative critical reactor studies bring to light the need of new DN yields data. For the Th fuel cycle, according to the OECD recommendation, DN of the 232Th is needed with an accuracy of 5%. In the literature, significant discrepancies were observed for energies below 4 MeV and data are dispersed ...

An Accelerator-based Neutron Generator is described that consists of a 30-MeV deuteron linear accelerator using a flowing liquid lithium target. With a continuous deuteron current of 100 milliamperes, a source intensity of more than 10 exp 16 neutrons per...

Using the method of albedo dosimetry, the neutron and photon dose and the mean (effective) neutron energy has been determined in the radiation fields of four different electron accelerators (two linear accelerators, two betatrons). Thermoluminescence-dose...

Glioblastoma multiforme and metastatic melanoma are frequent brain tumors in adults and presently still incurable diseases. Boron Neutron Capture Therapy (BNCT) is a promising alternative for this kind of pathologies. Accelerators have been proposed for BNCT as a way to circumvent the problem of siting reactors in hospitals and for their relative ...

Glioblastoma multiforme and metastatic melanoma are frequent brain tumors in adults and presently still incurable diseases. Boron Neutron Capture Therapy (BNCT) is a promising alternative for this kind of pathologies. Accelerators have been proposed for BNCT as a way to circumvent the problem of siting reactors in hospitals and for their relative ...

A program is underway at Los Alamos National Laboratory to develop nuclear data libraries for incident neutrons and protons to 150 MeV for accelerator-driven applications. These libraries will be used initially for design of an accelerator-based facility to produce tritium, including analysis of system performance, ...

Emissions of protons and alpha-particles from neutron and alpha-induced reactions have been estimated using two nuclear reaction model codes ALICE91 and PRECO-2000. Calculated results have been compared with available energy differential and double differential emission cross sections from experimental measurements. Analysis of the data based on different ...

A modeling investigation was performed to choose moderator material and size for creating optimal epithermal neutron beams for BNCT based on a proton accelerator and the 7Li(p,n)7Be reaction as a neutrons source. An optimal configuration is suggested for ...

Neutron fields in occupationally accessible areas around nuclear reactors, radioisotope sources and medical and high energy accelerators have been characterized using currently available information. Neutron, rem meters, such as the Leake detector, are th...

l963. The Wisconsin tandem accelerator is used part of the time for experiments in neutron physics. In these experiments the properties of neutrons from charged-particle reactions as well as the interaction of neutrons with nuclei are studied. Some of the techniques used and some of the results obtained ...

In this work we present an optimized neutron beam shaping assembly for epithermal Accelerator-Based Boron Neutron Capture Therapy (AB-BNCT) and discuss the simulations leading to its design.

In this work we present an optimized neutron beam shaping assembly for epithermal Accelerator-Based Boron Neutron Capture Therapy (AB-BNCT) and discuss the simulations leading to its design.

The Idaho National Engineering Laboratory (INEL) is developing a novel photoneutron-based nondestructive evaluation technique which uses a pulsed, high-energy (up to 8-MeV) electron accelerator and gamma-ray spectrometry. Highly penetrating pulses of bremsstrahlung photons are produced by each pulse of electrons. Interrogating neutrons are generated by the ...

The Idaho National Engineering Laboratory (INEL) is developing a novel photoneutron-based nondestructive evaluation technique which uses a pulsed, high-energy electron accelerator and gamma-ray spectrometry. Highly penetrating pulses of bremsstrahlung photons are produced by each pulse of electrons. Interrogating neutrons are generated by the ...

One of the more actual and promising fields of applied neutron physics is the investigation of the malfunctions induced by high-energy neutrons naturally present in the atmosphere in electronic devices, called single event effects (SEE). These studies are of primary importance for the design of devices that have to fulfill high ...

A field trip has been completed in which the neutron fluxes generated in several electron linear accelerators of different energies and beam intensities have been measured. Irradiations of canned homogenized chicken were made at these facilities and examined for short-lived and long-lived induced radioactivity. Preliminary ...

The Bevatron accelerated protons up to 6.2 GeV and heavy ions up to 2.1 GeV/amu. It operated from 1954 to 1993. Radioactivity was induced in some concrete radiation shielding blocks by prompt radiation. Prompt radiation is primarily neutrons and protons t...

The data on neutron spectra and intensity behind shielding are important for radiation safety design of high-energy accelerators since neutrons are capable of penetrating thick shielding and activating materials. Corresponding particle transport codes--that involve physics models of neutron and other particle ...

Radiological protection began with particle accelerators. Many of the concerns in the health physics profession today were discovered at accelerator laboratories. Since the mid-1940s, our understanding has progressed through seven stages: observation of high radiation levels; shielding; development of dosimetric techniques; studies of ...

Discussions on considerations and design of shielding for spallation neutron sources at accelerator facilities are summarized. (WHK)

... Descriptors : *TRITIUM, *PARTICLE ACCELERATOR TARGETS, *NEUTRON FLUX, SOURCES, DEUTERON REACTIONS, TRITON BEAMS, ION ...

... Title : DETAIL VISIBILITY ON NEUTRON RADIOGRAPHS PRODUCED WITH A 35 MEV ELECTRON LINEAR ACCELERATOR. Corporate Author : ...

The LASL ion linear accelerator program PIGMI and the application of the technology developed in this program to neutron therapy equipment is described.

A nationwide survey was conducted on electron accelerators for radiation therapy in Japan for obtaining fundamental data on the actual operational situation of these accelerators. The research subjects were all medical institutions equipped with electron accelerators for radiation therapy (874 accelerators) in ...

The goals of this study were (1) to verify calibration factors determined by previous experiment for relating counts from activated gold foils to neutron fluences, and (2) to use the method to determine neutron fluences under various operating conditions of the Varian Clinac 1800 (18-MeV) electron accelerator at the WPAFB Medical ...

The collapse of a massive star�s core, followed by a neutrino-driven, asymmetric supernova explosion, can naturally lead to pulsar recoils and neutron star kicks. Here, we present a two-dimensional, radiation-hydrodynamic simulation in which core collapse leads to significant acceleration of a fully formed, nascent neutron star via ...

It has been shown that the clinical quality of the neutron beam available for boron neutron capture therapy (BNCT) depends strongly on the design of the beam shaping assembly (BSA). The same study showed that a neutron source based on the {sup 7}Li(p,n) reaction, which is induced by protons ...

The Detector for Advanced Neutron Capture Experiments (DANCE) is a 4? BaF2 array consisting of 160 active detector elements. The primary purpose of the array is to perform neutron capture cross section measurements on small (>~100 ?g) and/or radioactive (<~100 mCi) species. The measurements made possible with this array will be useful in answering ...

Data from the survivors of the atomic bombs serve as the major basis for risk calculations of radiation-induced cancer in humans. A controversy has existed for almost two decades, however, concerning the possibility that neutron doses in Hiroshima may have been much larger than estimated. This controversy was based on measurements of radioisotopes ...

Drill-hole logging methods that utilize radioactivity are classified and examined. The methods studied are based on: detection of natural radioactivity (gamma logging); scattering of the GAMMA rays from a radioactive source (gammagamma logging); thermalization of neutrons from a fastneutron source (neutron logging); detection of capture gamma ...

In support of the Advanced Fuel Cycle Initiative, cross sections for hydrogen and helium production by neutrons are being investigated on structural materials from threshold to 100 MeV with the continuous-in-energy spallation neutron source at the Los Alamos Neutron Science Center (LANSCE). The present measurements are for elemental ...

The Detector for Advanced Neutron Capture Experiments (DANCE) is a 4{pi} BaF{sub 2} array consisting of 160 active detector elements. The primary purpose of the array is to perform neutron capture cross section measurements on small (> or approx.100 {mu}g) and/or radioactive (< or approx. 100 mCi) species. The measurements made possible with ...

Several positive-ion accelerators that are used as neutron sources for activation analysis are described. These accelerators produce neutrons from (p,n) or (d,n) reactions. The Van de Graaff accelerator and two portable neutron generators are illustrated. A mobile ...

... Accession Number : AD0193695. Title : PORTABLE ACCELERATING TUBE WITH ION SOURCE FOR NEUTRON GENERATOR. Corporate Author : ...

We show that, in the presence of radiation field, relativistic bulk flows can very quikly accelerate protons and electrons up to the energies limited either by Hillas criterion or by synchrotron losses. Unlike the traditional approach, we take advantage of continuous photon-induced conversion of charged particle species to neutral ones, and vice versa ...

An accelerator-based, active, pulsed, interrogation system capable of non-destructive, elemental analysis from secondary gamma-ray emissions is being developed for various inspection applications. The system consists of a very narrow pulsed, electron accelerator (> 8 MeV) for photoneutron production and a multiple channel, gamma-ray detection system ...

... fast neutron fluence of 1.8 x 1019 neutrons in ... and provide a significant pulsed neutron simulation ... caused breakdowns in the accelerator bank feed ...

... which accelerate the electrons and deuterons to produce x-rays and neutrons. ... A viable model for neutron and x-ray production in the pinch ...

The methology of radio biological experiments using radioactive isotopes as neutron sources is discussed as are accelerators and reactors. The physical mechanisms of neutron interaction with biological objects, methods of measuring and calculating the abs...

Radioactive nuclides are produced at high-energy electron accelerators by different kinds of particle interactions with accelerator components and shielding structures. Radioactivity can also be induced in air, cooling fluids, soil and groundwater. The physical reactions involved include spallations due to the hadronic component of ...

An ideal neutron beam for BNCT is a beam of epithermal neutrons, forward directed, and free of gamma rays and thermal and fast neutrons. Three neutron beams were evaluated, and compared: (1) the operating Brookhaven Medical Research Reactor (BMRR) epither...