Zobrazeno 1 - 10
of 137
pro vyhledávání: '"R.J. Gehrke"'
Autor:
R.J. Gehrke, John K. Hartwell
Publikováno v:
Applied Radiation and Isotopes. 63:223-228
Our laboratory has purchased four LaCl3(Ce) scintillation crystals over the course of the last year for evaluation as part of an environmental management research and development project. In addition to the expected content of naturally radioactive 1
Autor:
R.J. Gehrke, J.R. Davidson
Publikováno v:
Applied Radiation and Isotopes. 62:479-499
We propose practices to optimize the quality of acquired γ -ray spectra at a radioanalytical laboratory and to assist in the identification of extraneous spectral peaks including those from limitations in the physical setup, electronics, and countin
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 511:444-456
We report on the measurement of neutron-to-γ-ray production ratios from (α,n) reactions for three matrices CaF2, Al2O3, and MgO using α-emitting 244Cm deposited in the respective matrix. These ratios allow the determination of neutron emission rat
Publikováno v:
Waste Management. 20:555-559
The Ge γ-ray spectra of 241 Am were studied using sources of 241 Am that had not been purified from their daughter activities for many years. In spite of the fact that the first member of the 241 Am decay chain, 237 Np, has a half-life of 2.14×10 6
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 422:826-831
The authors have been involved in the calibration and use of three types of γ- and X-ray detectors for in situ measurements of soil contamination. These three detectors are an N-type, thin-window Ge semiconductor detector (5.0 cm diam.× 2.0 cm deep
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 353:109-113
PASS (Photon Analysis Spectrometer System) is a pulser-equipped, extended range, thin-window, Ge detector spectrometer that is capable of automatically measuring radionuclide activity concentrations in up to 100 samples per day at remediation sites.
Autor:
R.J. Gehrke
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 299:302-307
A major revision of the American National Standards Institute (ANSI) Standard N42.14, “Calibration and Use of Germanium Detectors for the Measurement of Gamma-Ray Emission Rates of Radionuclides”, is in process. The revised standard is more detai
Publikováno v:
Physical Review C. 41:2878-2882
The half-life of {sup 176}Lu was deduced using Ge {gamma}-ray spectrometry from the mass and activity of a lutetium oxide sample enriched in {sup 176}Lu. The half-life was found to be 4.05{plus minus}0.09{times}10{sup 10} y. The relative intensities
Autor:
K. Debertin, Bert M. Coursey, J.M.R. Hutchinson, R.J. Gehrke, D. Smith, L.D. Koeppen, R. Vaninbroukx, P.A. Mullen, D. Reher, J.W. Rogers
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 290:537-550
A solution of 93mNb in 1M HF + 1M HNO3 was dispensed into teflon containers and distributed to several laboratories to allow a definitive measurement of the emission probability for the 17 keV K X-rays. The material was characterized for stability, a
Publikováno v:
IEEE Symposium Conference Record Nuclear Science 2004..
The performance characteristics of four compact, room-temperature detectors - two scintillators and two semiconductor detectors - were studied. All are commercially-available detectors. The two scintillators were a O13 mm /spl times/ 13 mm lanthanum