Absolute measurements of weak neutron fluxes were achieved by activated manganese. A scintillation gamma counter calibrated to 4- pi beta-gamma coincidences was used for measuring the absolute activity of Mn/sup 56/. (R.V.J.)

The theoretical principles of neutron density measurements by the activation method are briefly shown. The experimental method consisting in phosphorus activation followed by absolute measurement of its activity in liquid scintillator is described. Some results of ...

A review of the usefulness and accuracy of methods for absolute measurements of the activity of isotopes is given. The solid angle and BETA -- gamma coincidence methods are described and results compared with the results of measurement of standards from The National Physical Laboratory, England. (auth)

... Valley Caldera, Mono County, California, 1985, USGS Water Resources Investiga ... and A. Ryall, Active tectonic and magmatic processes beneath ...

... clearance by measuring the time interval required for a radio frequency signal ... time required for the test item to become operational after activation. ...

As agent for the Commonwealth Scientific and Industrial Research Organisation, the Australian Atomic Energy Commission is responsible for the maintenance of the Australian standard of activity. The standard comprises activity measurement procedures involv...

... Title : Characteristic Functional of a Probability Measure Absolutely Continuous with Respect to a Gaussian Radon Measure. ...

... Title : Absolute Gravity Measurements with Reversible Pendulums at Potsdam, 1968-1969 (Absolute Schwaremessungen mit Reversionpendein in ...

The necessity of correcting the measurements of the beta activity of dense sources is indicated. The principle of the correction for self-absorption is explained, and a method used to determine the coefficient of correction to apply to make an absolute measure of the activity when ...

The ARC Digital Raster Imagery (ADRI) evaluation process was an evaluation of the absolute horizontal and vertical accuracy of the ADRI product. Both absolute and relative horizontal evaluation activities employed the same statistical measures for the ana...

The MSTAR sensor (Modulation Sideband Technology for Absolute Ranging) is a new system for measuring

... Accession Number : AD0616613. Title : AN ABSOLUTE MEASUREMENT OF THERMAL NEUTRON ALBEDO FOR SEVERAL MATERIALS. ...

... CURRENT UNDERSTANDING OF THE ABSOLUTE MEASUREMENTS OF THE AMOUNT, FREQUENCY SPECTRA, AND WAVE FORMS OF THE ...

... for Absolute Measurements at the ... of a Lyman-alpha photometer on ... MAGNETOSPHERE, ULTRAVIOLET RADIATION), SCIENTIFIC SATELLITES ...

The Environmental Science Division at Lawrence Livermore Laboratory has in use a system of absolute Instrumental Neutron Activation Analysis (INAA). Basically, absolute INAA is dependent upon the absolute measurement of the disintegration rates of the nuclides produced by neutron capture. From ...

An absolute measurement of exp 238 U capture rate was made on FCA Assembly V-2, a physics mock-up of JOYO. The method is that exp 239 Np activities were counted with a Ge(Li) detector which had been absolutely calibrated by using exp 238 U foils irradiate...

A method previously developed by Zumwalt for the determination in an absolute form of the decay rate of beta emitting nuclides is presented from the viewpoint of measurement conditions. A study was made of all the factors which arise in the measurement of the absolute activity using a ...

The utilization of the probe activation method for neutron flux measurements is described. The physical basis and the practical methods for the absolute measurements of thermal, resonance, and fast fluxes are explained and illustrated. The performance of such measurements on the Munich ...

The thermal neutron fluence rate is determined by the gold activation method. The absolute activity of the irradiated gold foil is measured by a 4??-? coincidence counter. Using this method, corrections for the detection of conversion electrons and gamma rays by a 4?? counter are very important to obtain accurate ...

A method is proposed to determine the absolute activities of thick $sup 60$Co, $sup 46$Sc, $sup 24$Na, and $sup 58$Co probes which are often used as activation detectors for neutron flux, fluency and spectrum measurements. In this method, activity can be measured by ...

Research investigations on an attempt to measure the absolute magnitude of activity coefficients of individual ionic species have been continued. In support of this objective, experimental measurements were made of the non-isothermal temperature coefficie...

... Title : EXTENSION OF ABSOLUTE FREQUENCY MEASUREMENTS TO 148 THZ: FREQUENCIES OF THE 20- AND 35- MICRONS XE LASER, IN ...

... Accession Number : AD0178854. Title : ABSOLUTE CAPACITANCE MICROCREEP AND DIMENSIONAL STABILITY MEASURING SYSTEM. ...

Topics covered include: Multi-Segment Radius Measurement Using an Absolute Distance Meter Through a Null Assembly; Fiber-Optic Magnetic-Field-Strength Measurement System for Lightning Detection; Photocatalytic Active Radiation Measurements and Use; Comput...

... Absolute Measurement of Sound Pressure in Liquids. ... of Plane, Finite Amplitude Waves in a ... Optical Method for Ultrasonic Velocity Measurements at ...

The recently completed OMEGA 64 upgrade at the Lab for Laser Energetics (LLE) at the University of Rochester required a recalibration of the DD neutron absolute yield detector. Measurement of DD neutron absolute yield is crucial to determining fuel densities. The method used to measure absolute ...

The Phase 1 project focused on the development of a multiwave interferometer to measure absolute distance. Its applications are in gauging and for measuring absolute position of machine tools, and coordinate measuring machines. This interferometer overcom...

Activation methods for determining the neutron spectral and spatial distributions in swimming-pool research reactors are outlined, The activation cross sections for several nuclides are tabulated in order to compare their usefulness in the flux activation methods. (T.F.H.)

In supplying radioisotopes produced in Japan Atomic Energy Research Institute, it is necessary to measure the specific activity (mC/mg), concentration (mC/ml), and total activity of each product. These are obtained from absolute values of radioactivity. Two methods of ...

A method for measurement of the absolute activity of beta sources is proposed that has high accuracy and takes into absorption of the soft component of the spectrum in the backing, which allows backings of various thicknesses (down to a half-absorption layer) to be used.

An international intercomparison of absolute activity measurements of a solution of Se-75, organized by the Bureau International des Poids et Mesures, France, in 1992, has been carried out. The methodology and results are presented. Source preparation, ex...

The authors measure the absolute wavefront of Beamlet output pulses and actively correct for slowly varying aberrations present when the power amplifiers are not fired. Provision is also made for active precompensation of pump-induced amplifier aberration...

The authors measure the absolute wavefront of Beamlet output pulses and actively correct for slowly varying aberrations present when the power amplifiers are not fired. Provision is also made for active precompensation of pump-induced amplifier aberrations.

We investigated the possibility of absolute source activity measurements by a single gamma spectrometer. The measurements were performed for three (point, cylinder and Marinelly shaped) calibrated 152Eu sources. Making use of data on peak, sum-peak and total spectrum area in the single spectrum, we developed the ...

A review is made of the various experimental methods used to determine the physics of natural uranium graphite, lattices. Integral lattice experiments reviewed include absolute and differential effective cross section measurements by activation methods and analysis of irradiated fuels and fine structure ...

The aim of the research program was to check the biokinetic data by direct, absolute quantification in man. For this purpose appropriate methods of measurement were developed. Liver and spleen activities were directly measured using a double energy window...

The sum-peak method is used at ENEA (Italian Agency for New Technologies, Energy and Environment) for the standardization of several radionuclides. The experimental apparatus, based on a Nal(TI) well type detector, is described and the measurement procedu...

Single or double ion chamber technique measures absolute radiation intensities in the extreme vacuum

Absolute frequency measurement and spectroscopy of gas laser transitions in far IR, analyzing Zeeman

... ABSOLUTE POSITION MEASUREMENT FOR AUTOMATED GUIDED VEHICLES USING THE GREEDY DEBRUIJN SEQUENCE by John E. Ortiz ...

... Title : Absolute Concentration Measurements of Free Radicals in Flames by Absorption Spectroscopy. Descriptive Note : Final rept. ...

... Title : Absolute Absorption Cross Section Measurements of Ozone and the Temperature Dependence at Four Reference Wavelengths Leading to ...

... Accession Number : AD0625664. Title : ABSOLUTE SPECTRAL DISTRIBUTION MEASUREMENTS OF XENON HIGH-PRESSURE DISCHARGES. ...

... Accession Number : AD0190479. Title : ABSOLUTE LENGTH MEASUREMENT AT HIGH PRESSURE. Corporate Author : ...

... AD0822914. Title : ABSOLUTE DOSE MEASUREMENTS ON A MEGACURIE CO-60 SOURCE BY MEANS OF CALORIMETRY. ...

... Accession Number : AD0771216. Title : A Simple Method for Measuring Absolute Diffuse Reflectance with a Laboratory Spectrophotometer. ...

An activation technique using coincidences between characteristic X-rays and ?-rays to obtain absolute cross-sections is described. This method is particularly useful in the case of nuclei that decay by electron capture. In addition to the reduction of possible contamination, an improved detection sensitivity is achieved as compared to inclusive ...

In this paper we present a prototype of a new class of detectors, metallic magnetic calorimeters operating at cryogenic temperatures, which we are developing for absolute activity measurement of low-energy-emitting radionuclides. We explain the detection principle and give a detailed description of the realisation of the prototype, ...

A method is described for determining the amount of mercury (II) in radioactively labelled chlormerodrin and mercuric chloride. By measuring the absolute activity in an ionization chamber, the specific activity is therefore immediately obtained. The deter...

Counting efficiencies of a (gamma)-ray spectroscopy system are necessary for foil activation measurement of absolute (sup 235)U fission rate, absolute (sup 238)U capture rate and ratio of these reactions in JAERI fast critical assembly (FCA). Comparison o...

The absolute activity of U-235 contained in a UO/sub 2/ sample, using a sum-coincidence circuit which selected only the alpha particles which were simultaneous with the well known 184 Kev gamma radiation from Th-231. The alpha particles were detected by Z...

The density of neutrons in a standard pile was determined between the zero-energy and the cut-off energy of 1 mm thick cadmium unit using a gold detector. Its absolute activity was measured using a 4 pi beta counter calibrated for 4 pi beta, gamma coincid...

Results of two studies, one based on daily measurements over a period of approximately 5.5 weeks and the other measurements over a period of 62 days led to the conclusion that the ground-level atmospheric alpha activity was subject to variations of at least an order of magnitude. Possibly significant correlations were found between ...

... Title : Absolute, Extreme Ultraviolet Solar Spectral Irradiance Monitor (AESSIM). ... film filters to make absolute measurements of EUV radiation over a ...

This test operations procedure (TOP) delineates general test and specific subtest procedure required to determine the technical performance of absolute altimeters. Absolute altimeters which are used to measure vertical separation between the aircraft and ...

from the measurement and an absolute measurement of the test surface can be obtained. This paper is not exactly an absolute measurement, but as long as the test surface has even symmetry, the test can of spherical surfaces as described by Jensen2 requires three separate ...

This report presents the results of a measurement of the half-life of tritium by absolute counting. The method consisted in the mass-spectrometric analysis of a hydrogen-tritium mixture enriched in tritium, the dilution of some of this material with hydrogen in a known way to a countable level of activity, and the counting of a portion ...

AESSIM, the Absolute, Extreme-Ultraviolet, Solar Spectral Irradiance Monitor, is designed to measure

Absolute Flux Density Calibrations: Receiver Saturation Effects ... positive or negative measurement errors, with polarity depending upon operating ...

... Title : ABSOLUTE CALIBRATION OF AURORAL PHOTOMETERS AND GROUND-BASED MEASUREMENTS IN THE 3200-7500-ANGSTROMS ...

... Accession Number : AD0481363. Title : ABSOLUTE AND RELATIVE SPECTRAL LINE INTENSITY MEASUREMENTS IN A PLASMA SHOCK TUBE. ...

The absolute rate constants for the cycloaddition reactions of three arylhalocarbenes to two alkenes have been measured as a function of pressure in the range 0.1 to 203 MPz. In all cases the observed rate constants were found to increase with increasing ...

>The EMIA-1 pulse ionization chamber is designed for the absolute measurement of the alpha activity of sources, where the intensity is of the order of several tenths of a microcurie. The apparatus is easy to operate and gives reproducible results. The characteristics of the EMIA-1 are reported, and a schematic is given. ...

Efforts were concentrated on the spectral resolution of the Airborne Oceanographic Lidar (AOL). This year's work was targeted towards the analysis of calibration techniques to enable the AOL to measure absolute radiances of both passive and active modes o...

ABS>A method developed for recording the isotopes undergoing K-capture effects and an improved electromagnetic analyzer used in the absolute count of K capture events are described. The simplicity of the installation and accurate identification of radiation are the best features of the apparatus. (R.V.J.)

Approximately 1,000 stack and occupation air samples from plutonium and uranium facilities at LASL are analyzed daily. The concentrations of radio-nuclides in air are determined by measuring absolute alpha activities of particulates collected on air sampl...

A high-temperature gel permeation chromatograph has been acquired for the measurement of absolute molecular weight distribution to support a MURI program on Tunable Optical Polymer Systems. Conjugated polymers have been actively pursued over the past two ...

This paper describes some techniques used in the design of high resolution gridded ionisation chambers for measurements of absolute activity of radionuclides. Details of the geometry of the system and its electrodes are presented; their shape and the spac...

The data collected for the worldwide, double-round-robin determination of the conversion coefficient used to calculate the interstitial oxygen content of silicon from infrared absorption measurements is presented. Detailed statistical of the data is also presented. The approach taken to determine the conversion coefficient was to conduct inter-laboratory round robins for both ...

A detailed description of the design, theory, calibration, and operation of a calorimetric device developed and intended for measuring the absolute activity of alpha preparations (particularly Ra preparations) is given. The device can also be used as a BETA calorimeter, in which case the alpha glass envelopes are suitably ...

... Plasmodium falciparum: Role of Absolute Stereochemistry in the Antimalarial Activity of Synthetic Amino Alcohol Antimalarial Agents ...

... Title : Plasmodium Falciparum: Role of Absolute Stereochemistry in the Antimalarial Activity of Synthetic Amino Alcohol Antimalarial Agents. ...

Accuracy of 10% is demanded to the absolute fusion measurement on ITER. To achieve this accuracy, a functional combination of several types of neutron measurement subsystem, cross calibration among them, and in situ calibration are needed. Neutron transport calculation shows the suitable calibration source is a DT/DD neutron generator ...

Accuracy of 10% is demanded to the absolute fusion measurement on ITER. To achieve this accuracy, a functional combination of several types of neutron measurement subsystem, cross calibration among them, and in situ calibration are needed. Neutron transport calculation shows the suitable calibration source is a DT/DD neutron generator ...

For the absolute measurement of the thermal neutron flux inside a nuclear reactor, a test specimen, e.g., a gold foil, is fluxed within a cartridge. The cartridge is movable inside a tube under the influence of pneumatic pressure, so that the cartridge is brought into position inside the reactor and held in this position by pressure against a stop ...

Center, we have measured the absolute refractive index of five specimens ... temperature-dependent Sellmeier fits of measured refractive index are also ...

For the absolute estimation of the resonance neutron flux by the activation of resonance probes, it is necessary to know the neutron self- screening in the probe in thick probes and in beta counting to know the magnitude of the beta self-absorption. For the determination of these magnitudes a function is calculated which gives the resonance ...

... A discussion is given of the theory of measuring the temperature of plasmas in combustion chambers and MHD ducts by recording the absolute ...

The paper describes the development of an absolute calibration standard for irradiance measurements.