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Title: Absolute instrumental neutron activation analysis at Lawrence Livermore Laboratory

Abstract

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 such disintegration rate data, the amount of the target element present in the irradiated sample is calculated by dividing the observed disintegration rate for each nuclide by the expected value for the disintegration rate per microgram of the target element that produced the nuclide. In absolute INAA, the expected value for disintegration rate per microgram is calculated from nuclear parameters and from measured values of both thermal and epithermal neutron fluxes which were present during irradiation. Absolute INAA does not depend on the concurrent irradiation of elemental standards but does depend on the values for thermal and epithermal neutron capture cross-sections for the target nuclides. A description of the analytical method is presented.

Authors:
Publication Date:
Research Org.:
California Univ., Livermore (USA). Lawrence Livermore Lab.
OSTI Identifier:
5229790
Report Number(s):
UCRL-80476; CONF-771072-4
TRN: 78-006079
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 3. international conference on nuclear methods in environmental and energy research, Columbia, MO, USA, 10 Oct 1977
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ACTIVATION ANALYSIS; CALCULATION METHODS; DESIGN; GAMMA SPECTROMETERS; IRRADIATION; LAWRENCE LIVERMORE LABORATORY; NEUTRON ACTIVATION ANALYZERS; CHEMICAL ANALYSIS; MEASURING INSTRUMENTS; NATIONAL ORGANIZATIONS; SPECTROMETERS; US AEC; US ERDA; US ORGANIZATIONS; 400101* - Activation, Nuclear Reaction, Radiometric & Radiochemical Procedures

Citation Formats

Heft, R E. Absolute instrumental neutron activation analysis at Lawrence Livermore Laboratory. United States: N. p., 1977. Web.
Heft, R E. Absolute instrumental neutron activation analysis at Lawrence Livermore Laboratory. United States.
Heft, R E. 1977. "Absolute instrumental neutron activation analysis at Lawrence Livermore Laboratory". United States. https://www.osti.gov/servlets/purl/5229790.
@article{osti_5229790,
title = {Absolute instrumental neutron activation analysis at Lawrence Livermore Laboratory},
author = {Heft, R E},
abstractNote = {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 such disintegration rate data, the amount of the target element present in the irradiated sample is calculated by dividing the observed disintegration rate for each nuclide by the expected value for the disintegration rate per microgram of the target element that produced the nuclide. In absolute INAA, the expected value for disintegration rate per microgram is calculated from nuclear parameters and from measured values of both thermal and epithermal neutron fluxes which were present during irradiation. Absolute INAA does not depend on the concurrent irradiation of elemental standards but does depend on the values for thermal and epithermal neutron capture cross-sections for the target nuclides. A description of the analytical method is presented.},
doi = {},
url = {https://www.osti.gov/biblio/5229790}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Dec 21 00:00:00 EST 1977},
month = {Wed Dec 21 00:00:00 EST 1977}
}

Conference:
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