... SHIELDING), (*NUCLEAR RADIATION, SHIELDING), LINEAR ... HAZARDS, MATERIALS, SAFETY ... NUCLEAR RADIATION SHIELD, PROTECTION & ...

This report discusses the following topics: Composition of Accelerator Radiation Fields; Shielding of Electrons and Photons at Accelerators; Shielding of Hadrons at Accelerators; Low Energy Prompt Radiation Phenomena; Induced Radioactivity at Accelerators...

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

Benchmark problems were prepared for evaluating the calculation codes and the nuclear data for accelerator shielding design by the Accelerator Shielding Working Group of the Research Committee on Reactor Physics in JAERI. Four benchmark problems are trans...

This simulation shows how electric field shielding tubes enable particle accelerators to work. In this interactive game, the user sets the location and size of shielding tubes and achieve the greatest speed of the accelerated particle.

... Keywords: Flash X-ray accelerator; Radiation shielding ... PARTICLE ACCELERATORS, RADIATION, JOBS, SAFETY, SHIELDING, RADIOLOGY. ...

Energy- and angular distributions of neutrons behind concrete side shielding of proton accelerators were calculated. Simple arguments are given to understand the characteristic shape of the neutron spectrum. Calculations were repeated to receive data for simple shielding estimations. The dose equivalent attenuation coefficient of ...

Comparisons are made between electron and proton shielding problems. The health physicist, charged with shielding either type of accelerator, must ask himself, ''Am I faced with a thick or thin shield problem.'' For the electron accelerator, he may be able to ...

The goal of accelerator shielding design is to protect the workers, general public, and the environment against unnecessary prompt radiation from accelerator operations. Additionally, shielding at accelerators may also be used to reduce the unwanted background in experimental detectors, to ...

Optimum shielding of the radiation from particle accelerators requires knowledge of the attenuation characteristics of the shielding material. The most common material for shielding this radiation is concrete, which can be made using various materials of ...

The design, construction, and specifications of prefabricated concrete blocks of various sizes and weights for reactor and accelerator shielding are discussed. Evaluations were made of various types of shielding and satisfactory results are reported. (R.V.J.)

Shielding design calculations for high energy electron accelerators are usually carried out using the point kernel method based on a point source assumption. In order to achieve more realistic and reasonable shielding design of SPring-8, we derive a formu...

... This search queries the DTIC Online Public Web ... MANAGEMENT, SYMPOSIA, EXPERT SYSTEMS, COMPUTERIZED SIMULATION, CORROSION. ...

The experimental basis of shielding design for high-energy accelerators that has been established over the past thirty years is described. Particular emphasis is given to the design of large accelerators constructed underground. The first data obtained fr...

This report discusses the following topics: Composition of Accelerator Radiation Fields; Shielding of Electrons and Photons at Accelerators; Shielding of Hadrons at Accelerators; Low Energy Prompt Radiation Phenomena; Induced Radioactivity at Accelerators; Topics in ...

The FLUKA Monte Carlo program was used to calculate the dose equivalent behind a homogeneous concrete shielding for primary energies between 10 and 800 given.

Various problems for designing the shield of the synchrotron radiation facility are summalized and discussed. The characteristics of the radiation fields and of the administration on radiation protection around the facility are also presented. (author). (...

iSHIELD11 performs a line-source numerical integration of radiation source terms that are defined by the iSHIELD11 computer code[1] . An example is provided to demonstrate how one can use iSHIELD11 to perform a shielding analysis for a 250 GeV electron linear accelerator.

The purpose of this work was to support the design of neutron shields for medium-energy accelerators using neutron transport codes and high-energy cross-section sets. In addition, an estimate was made of the effect of conservatism on facility cost, and thus the incentive to reduce uncertainty associated with the analyses.

Bearing in mind the well-known advantages of precast construction, we have the opportunity of fabricating concrete blocks of various weightvolume ratios for the shielding walls of nuclear reactors and particle accelerators. A mold of the casette type make...

Some results of high-energy neutron spectrum measurements in different radiation fields outside accelerator shielding are presented. The spectra have been unfolded by the statistical regularization method on data of a deviece intended for measurements of ...

The Moyer method is applied to the design of transverse shielding for an electron linear accelerator, assuming uniform beam power loss along the accelerator structure. Parameters for this application are given and sample calculations are shown. For a beam...

In the first chapter, terminology, physical and radiological quantities, and units of measurement used to describe the properties of accelerator radiation fields are reviewed. The general considerations of primary radiation fields pertinent to accelerators are discussed. The primary radiation fields produced by electron beams are described qualitatively ...

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

... in shields. An electron linear accelerator (Linac) was used to produce intense 50-nsec pulses of photoneutrons. These ...

A rough calculation of the expected levels of radiation for the present shielding is made. (auth)

The estimation of radioactivity induced in concrete shielding is important for the decommissioning of accelerator facilities. Concentrations of (3)H and (14)C in the concrete shielding of an electron linear accelerator were measured, and the depth distributions of (3)H and (14)C and gamma-ray emitters were ...

Prevention of electromagnetic interference (EMI), or ``noise pickup,`` is an important design aspect in large detectors in accelerator environments. Shielding effectiveness as a function of shield thickness and conductivity vs the type and frequency of the interference field is described. Noise induced in transmission lines by ground ...

Superconducting dipoles and quadrupoles for existing accelerators have a coil surrounded by an iron shield. The shield limits the fringe field of the magnet while having minimal effect on the field shape and providing a small enhancement of the field strength. Shields using superconducting materials can be thinner ...

After introducing the subject or shielding high energy accelerators, point source, line-of-sight models, and in particular the Moyer Model, are discussed. Their use in the shielding of proton and electron accelerators is demonstrated and their limitations noted, especially in relation to ...

With the advent of a new generation of high-energy and high-intensity proton accelerators such as the one being built at the National Accelerator Laboratory and the one proposed by CERN, the problem of shielding external proton targets, the secondary beams produced from these targets, and even the secondary targets in the experimental ...

With the advent of a new generation of high-energy and high-intensity proton accelerators such as the one being built at the National Accelerator Laboratory and the one proposed by CERN, the problem of shielding external proton targets, the secondary beams produced from these targets, and even the secondary targets in the experimental ...

The Sandia National Laboratories Particle Beam Fusion Accelerator PBFA-II is expected to produce significant amounts of penetrating radiation. The present study considers a postulated operational scenario for the accelerator and determines the amount of s...

The Podcast: Acceleration is a segment of the Force and Motion Short Course. The podcast is 2 minutes 13 seconds in duration. Presented by science experts and NSTA staff, the NSTA Online Short Courses are professional development opportunities de

The Project Office will designate Subject Matter Experts (SMEs) in specific ... SMEs (e.g., radiation design, shielding, instrument accommodation) ...

The experts, nation-wide, had a lot of aging data on nylon chutes but little or none on Dacron. Every one thought we would be OK, but suggested if we had ...

In 1992 AECL Research convened a panel of external hydrogeological experts consisting of P.A. Domenico, G.E. Grisak, and F.W. Schwartz, to review AECL's proposed approach to siting a geological repository in the rocks of the Canadian Shield for the safe d...

ABS>A combination of two accelerators, a cyclotron and a ring-shaped accelerator which has a portion disposed tangentially to the cyclotron, is described. Means are provided to transfer particles from the cyclotron to the ring accelerator including a magnetic deflector within the cyclotron, a magnetic ...

... of the collections listed below at ... System for Federal Government Notice ... ADMINISTRATION, ACCELERATION, LAW ENFORCEMENT, TEACHING ...

The results of investigations of the problems of shielding against radiations from alpha particle, deuteron, and proton accelerators are summarized. Recent calculated and experimental data on shielding against gamma radiation from residual radioactivity are given. (64 references) (auth)

-filled with a dense material (e.g. concrete or steel) � All the way through concrete radiation shielding Contact), a radioactive material management area (RMMA), or part of accelerator shielding (for example, the Accelerator, such as radiological shielding or hazardous material confinement ...

Detailed calculations of the accelerator related background in the CDF forward muon spectrometer have been performed with the MARS13 code and a newly developed C++ code for particle tracking in accelerator lattices. Calculated space distributions of background hits are in a good agreement with data taken in Run I. Several shielding ...

An investigation was performed to examine the neutron dose equivalent in a radiotherapy maze lined with a customised neutron shielding material. The accelerator investigated was a Varian Clinac 2100C/D using 18 MV photons, and the neutron shielding utilised at this centre was Premadex commercially available neutron ...

Descriptions of the target cart and dismantling shield for the 60-in. cyclotron are given. Means were provided for moving the target from the accelerator area to a shielded box where the target assembly was dismantled. The shield permitted each section of the target assembly to be visually inspected, to ...

The Stanford Synchrotron Radiation Laboratory (SSRL) Injector is comprised of a linear accelerator (linac) capable of energies {le} 150 MeV, a 3 GeV booster synchrotron, and a beam line to transport the electrons into the storage ring SPEAR. The injector is shielded so that under normal operating conditions, the annual dose equivalent at the ...

The neutron leakage from medical and industrial electron accelerators has become an important problem and its detection and shielding is being performed in their facilities. This study provides a new simple method of design calculation for neutron shielding of those electron accelerator facilities by dividing into ...

This paper summarizes results of Spallation Neutron Source calculations to estimate radiation hazards and shielding requirements for activated Mercury, target components, target cooling water, and ⁷Be plateout. Dose rates in the accelerator tun...

Until very recently, no experimental information on spectra of high-energy protons generated in the shielding of accelerators has been available in the literature. Such information is necessary not only to establish the degree of radiation risk due to thi...

Results of a brief test series aimed at screening a number of potential bremsstrahlung converter debris shield materials are reported. These tests were run on Sandia National Laboratories' Hydramite II accelerator using a diode configuration which produce...

Extremely simple and universal way was suggested for calculation of the shielding of any configuration (except the traps) over the given losses of accelerated particles in the energy range from 1 up to 2,000 GeV. The way is confortable when operatively so...

Electron beam accelerators are commonly used to create bremsstrahlung x-rays for effects testing. Typically, the incident electron beam strikes a sandwich of three materials: (1) a conversion foil, (2) an electron scavenger, and (3) a debris shield. Sever...

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 - t...

The literature on shielding experiment and calculation of high energy particles above 20 MeV has been surveyed. The survey covers thirteen journals, from 1965 up to 1989. For each paper, applicable information is listed on type and energy of the projectile, the accelerator used, composition and thickness of the target and shielding ...

The authors analyze the sheath helix model of the pulseline accelerator. They find the dispersion relation for a shielded helix with a dielectric material between the shield and the helix and compare it against the results from 3-D electromagnetic simulations. Expressions for the fields near the beam axis are obtained. A scheme to ...

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 modifying effects of ...

Radiation transport occurs through the 18 m long access way adjacent to the Spallation Neutron Source accelerator tunnel and the 2.2 m thick massive shielding door which closes the access way. A variety of typical materials for accelerator shielding, such as concrete and steel, were used for construction of the ...

Differences in synchrotron radiation beamline shielding design between the facilities of 3 GeV class and 8 GeV class are discussed with regard to SLAC SSRL and SPring-8 beamlines. Requirements of beamline shielding as well as the accelerator shielding depend on the stored electron energy, and here some factors in ...

Shield doors for hot cells, gamma irradiation cells, xray machines, and accelerators are selected according to basic features and requirements of the facilities. The choice of door type depends on user plans for cell arrange ment, type of work anticipated, and traffic access as well as door characteristics such as methods of support and motion, ...

For several years, research has been ongoing in the Ohio State University (OSU) Nuclear Engineering Program toward the development of an accelerator-based irradiation facility (ANIF) neutron source for boron neutron capture therapy (BNCT). The ANIF, which is planned to be built in a hospital, has been conceptually designed and analyzed. After Qu, an OSU researcher, determined ...

The plasma may be used in accelerators mass spectrometers, reactors and other electrical devices. A method and apparatus are disclosed for producing a plasma in an evacuated enclosure permeated by a suitable magnetic field wherein the plasma is shielded f...

Sep 18, 2009 ... By leveraging libraries such as the ones we will develop for this project, the user is shielded from the intricacies of GPU programming ...

Potential applications include, but are not limited to, particle accelerators, nuclear reactors, radioactive biological and nuclear waste containment ...

Effectiveness of eye shields in reducing the dose to the eye lens from 6 and 9 MeV electron beams from a linear accelerator has been evaluated. The thickness of the shields made from cerrobend was such that only bremsstrahlung photons were transmitted. A shield with a diameter of 1.3 cm and thickness of 1 cm was ...

Effectiveness of eye shields in reducing the dose to the eye lens from 6 and 9 MeV electron beams from a linear accelerator has been evaluated. The thickness of the shields made from cerrobend was such that only bremsstrahlung photons were transmitted. A shield with a diameter of 1.3 cm and thickness of 1 cm was ...

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...

Particle accelerators have evolved over the last 50 years from simple devices to powerful machines, and will continue to have an important impact on research, technology and lifestyle. Today they cover a wide range of applications, from television and com...

Everyday features of the accelerator environment include long cable runs, high power and low level equipment sharing building space, stray electromagnetic fields and ground voltage differences between the sending and receiving ends of an installation. Thi...

Medium energy nuclear data in the 1--1000 MeV range is necessary to accelerator applications which include spallation neutron sources for radioactive waste treatment and accelerator shielding design, medical applications which include isotopes production ...

An accelerator health physicist can make contributions in many fields of science in addition to the various operational tasks that he is charged with. He can support others in his laboratory by designing shielding for new accelerators and storage rings, b...

Fundamentals of a Monte Carlo program for calculating the radiation exposure due to bremsstrahlung outside of accelerator buildings without having shielding roofs are described. Some of the results obtained are presented for various target materials of el...

Activation of groundwater due to beam loss at the Superconducting Super Collider (SSC) is discussed, with activation criteria and models presented. Estimates are given of maximum beam losses allowed in the various accelerators of the SSC to meet federal drinking water standards, assuming no additional shielding is provided.

The paper describes an approach taken within the EURISOL-DS project (European Isotope Separation Online Radioactive Ion Beam Facility) to a number of safety and radioprotection issues raised by the advent of radioactive ion beam facilities in the cutting edge area of particle accelerators. The ensuing solution emerged from a collaborative effort of the investigating ...

The design of a shield winding to be placed around a superconductive magnet is discussed. By operating the shield and main winding in parallel, it is possible to transfer energy to and from the magnet system without exposing the superconductive coil to a changing field, thereby eliminating ac losses in the superconductor and stabilizer. Such ...