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Title: Evaluation of the Fluence Conversion Factor for 32P in Sulfur

Abstract

When 32S is exposed to neutrons it undergoes a 32S(n,p) 32P reaction with a neutron cross section as shown in Figure 1. This reaction may be used to characterize the neutron fluence for neutrons greater than 3 MeV. The 32P activity is measured and a fluence conversion factor is applied to determine the total neutron fluence above 3 MeV. The fluence conversion factor may be empirically determined by exposing 32S to a characterized neutron flux, or theoretically calculated from the neutron cross section for 32S. For the LLNL Neutron Activation Dosimeters (NADs) the fluence conversion factor was established by Hankins in 1984. This value was based on measurement of exposed sulfur pellets to a series of three different exposures to a known neutron flux using the Health Physics Research Reactor located at Oak Ridge National Laboratory (personal communication with Hankins). It is believed that the 32P in the sulfur pellets were measured using Beckman Widebeta and Sharp Lowbeta gas-flow proportional counters which are no longer available. The fluence conversion factor (CF φ) for the personnel NAD was empirically determined by comparing the known neutron fluence to the decay corrected activity of 32P in a series of sulfur pellets exposed formore » three different fluences.« less

Authors:
 [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1491985
Report Number(s):
LLNL-TR-764957
955005
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
Chemistry - Radiation chemistry, radiochemistry, and nuclear chemistry

Citation Formats

Wong, C. T. Evaluation of the Fluence Conversion Factor for 32P in Sulfur. United States: N. p., 2019. Web. doi:10.2172/1491985.
Wong, C. T. Evaluation of the Fluence Conversion Factor for 32P in Sulfur. United States. doi:10.2172/1491985.
Wong, C. T. Wed . "Evaluation of the Fluence Conversion Factor for 32P in Sulfur". United States. doi:10.2172/1491985. https://www.osti.gov/servlets/purl/1491985.
@article{osti_1491985,
title = {Evaluation of the Fluence Conversion Factor for 32P in Sulfur},
author = {Wong, C. T.},
abstractNote = {When 32S is exposed to neutrons it undergoes a 32S(n,p)32P reaction with a neutron cross section as shown in Figure 1. This reaction may be used to characterize the neutron fluence for neutrons greater than 3 MeV. The 32P activity is measured and a fluence conversion factor is applied to determine the total neutron fluence above 3 MeV. The fluence conversion factor may be empirically determined by exposing 32S to a characterized neutron flux, or theoretically calculated from the neutron cross section for 32S. For the LLNL Neutron Activation Dosimeters (NADs) the fluence conversion factor was established by Hankins in 1984. This value was based on measurement of exposed sulfur pellets to a series of three different exposures to a known neutron flux using the Health Physics Research Reactor located at Oak Ridge National Laboratory (personal communication with Hankins). It is believed that the 32P in the sulfur pellets were measured using Beckman Widebeta and Sharp Lowbeta gas-flow proportional counters which are no longer available. The fluence conversion factor (CFφ) for the personnel NAD was empirically determined by comparing the known neutron fluence to the decay corrected activity of 32P in a series of sulfur pellets exposed for three different fluences.},
doi = {10.2172/1491985},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {1}
}