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Title: METHOD OF CALCULATING EFFECTIVE CUTOFF ENERGIES FOR FILTERS USED WITH "1/v" DETECTORS

Abstract

A study was undertaken to construct computer programs to be used for the calculation of effective cutoff energies for filters which are employed with 1/v detectors. Two IBM-704 programs,"GQF-3" and "GQF-2," were prepared for this purpose. The first program is for isotropic flux while the latter is for beam flux. Both the filter and detector foils are assumed to be thin and flat, thereby neglecting edge effects. The absorption rate in the detector foil in "GQF-3" was integrated over energy, thickness of detector foil, and angle of neutron incidence. In "CQF-2," the neutrons are restricted to a beam flux, therefore eliminating the integration over angle. The spectrum which is used in these calculations is assumed to consist of a Maxwellian plus a 1/E flux which goes to zero (sharply) at 5 times the Maxwellian characteristic energy E/sub m/. The integrations were performed by Gaussian Quadratures, and a fairly extensive list of Gaussian factors is included. (auth)

Authors:
;
Publication Date:
Research Org.:
Knolls Atomic Power Lab., Schenectady, N.Y.
OSTI Identifier:
4159451
Report Number(s):
KAPL-M-GDH-3
NSA Number:
NSA-14-017975
DOE Contract Number:  
W-31-109-ENG-52
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-60
Country of Publication:
United States
Language:
English
Subject:
ENGINEERING AND EQUIPMENT; ABSORPTION; ANGULAR DISTRIBUTION; BEAMS; BOLTZMANN STATISTICS; COMPUTERS; CONFIGURATION; DIFFERENTIAL EQUATIONS; EFFICIENCY; ENERGY; FILTERS; FOILS; GAUSS QUADRATURES; IBM 704; NEUTRON BEAMS; NEUTRON FLUX; PROGRAMMING; RADIATION DETECTORS; SPECTRA; THICKNESS

Citation Formats

Hickman, G D, and Leng, W B. METHOD OF CALCULATING EFFECTIVE CUTOFF ENERGIES FOR FILTERS USED WITH "1/v" DETECTORS. United States: N. p., 1960. Web.
Hickman, G D, & Leng, W B. METHOD OF CALCULATING EFFECTIVE CUTOFF ENERGIES FOR FILTERS USED WITH "1/v" DETECTORS. United States.
Hickman, G D, and Leng, W B. 1960. "METHOD OF CALCULATING EFFECTIVE CUTOFF ENERGIES FOR FILTERS USED WITH "1/v" DETECTORS". United States.
@article{osti_4159451,
title = {METHOD OF CALCULATING EFFECTIVE CUTOFF ENERGIES FOR FILTERS USED WITH "1/v" DETECTORS},
author = {Hickman, G D and Leng, W B},
abstractNote = {A study was undertaken to construct computer programs to be used for the calculation of effective cutoff energies for filters which are employed with 1/v detectors. Two IBM-704 programs,"GQF-3" and "GQF-2," were prepared for this purpose. The first program is for isotropic flux while the latter is for beam flux. Both the filter and detector foils are assumed to be thin and flat, thereby neglecting edge effects. The absorption rate in the detector foil in "GQF-3" was integrated over energy, thickness of detector foil, and angle of neutron incidence. In "CQF-2," the neutrons are restricted to a beam flux, therefore eliminating the integration over angle. The spectrum which is used in these calculations is assumed to consist of a Maxwellian plus a 1/E flux which goes to zero (sharply) at 5 times the Maxwellian characteristic energy E/sub m/. The integrations were performed by Gaussian Quadratures, and a fairly extensive list of Gaussian factors is included. (auth)},
doi = {},
url = {https://www.osti.gov/biblio/4159451}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 10 00:00:00 EDT 1960},
month = {Tue May 10 00:00:00 EDT 1960}
}

Technical Report:
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