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Title: Method for correcting for isotope burn-in effects in fission neutron dosimeters

Abstract

A method is described for correcting for effect of isotope burn-in in fission neutron dosimeters. Two quantities are measured in order to quantify the "burn-in" contribution, namely P.sub.Z',A', the amount of (Z', A') isotope that is burned-in, and F.sub.Z', A', the fissions per unit volume produced in the (Z', A') isotope. To measure P.sub.Z', A', two solid state track recorder fission deposits are prepared from the very same material that comprises the fission neutron dosimeter, and the mass and mass density are measured. One of these deposits is exposed along with the fission neutron dosimeter, whereas the second deposit is subsequently used for observation of background. P.sub.Z', A' is then determined by conducting a second irradiation, wherein both the irradiated and unirradiated fission deposits are used in solid state track recorder dosimeters for observation of the absolute number of fissions per unit volume. The difference between the latter determines P.sub.Z', A' since the thermal neutron cross section is known. F.sub.Z', A' is obtained by using a fission neutron dosimeter for this specific isotope, which is exposed along with the original threshold fission neutron dosimeter to experience the same neutron flux-time history at the same location. In order to determine themore » fissions per unit volume produced in the isotope (Z', A') as it ingrows during the irradiation, B.sub.Z', A', from these observations, the neutron field must generally be either time independent or a separable function of time t and neutron energy E.« less

Inventors:
 [1];  [1]
  1. (Richland, WA)
Issue Date:
Research Org.:
WESTINGHOUSE HANFORD CO
OSTI Identifier:
866591
Patent Number(s):
4744939
Assignee:
United States of America as represented by United States (Washington, DC) OSTI
DOE Contract Number:  
AC06-76FF02170
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; correcting; isotope; burn-in; effects; fission; neutron; dosimeters; described; effect; quantities; measured; quantify; contribution; namely; z; amount; burned-in; fissions; unit; volume; produced; measure; solid; track; recorder; deposits; prepared; material; comprises; dosimeter; mass; density; exposed; deposit; subsequently; observation; background; determined; conducting; irradiation; irradiated; unirradiated; absolute; difference; latter; determines; thermal; section; obtained; specific; original; threshold; experience; flux-time; history; location; determine; ingrows; observations; field; time; independent; separable; function; energy; specific isotope; neutron energy; track recorder; thermal neutron; neutron flux; fission neutron; unit volume; neutron dosimeter; isotope burn-in; neutron dosimeters; mass density; /376/250/

Citation Formats

Gold, Raymond, and McElroy, William N. Method for correcting for isotope burn-in effects in fission neutron dosimeters. United States: N. p., 1988. Web.
Gold, Raymond, & McElroy, William N. Method for correcting for isotope burn-in effects in fission neutron dosimeters. United States.
Gold, Raymond, and McElroy, William N. Fri . "Method for correcting for isotope burn-in effects in fission neutron dosimeters". United States. https://www.osti.gov/servlets/purl/866591.
@article{osti_866591,
title = {Method for correcting for isotope burn-in effects in fission neutron dosimeters},
author = {Gold, Raymond and McElroy, William N.},
abstractNote = {A method is described for correcting for effect of isotope burn-in in fission neutron dosimeters. Two quantities are measured in order to quantify the "burn-in" contribution, namely P.sub.Z',A', the amount of (Z', A') isotope that is burned-in, and F.sub.Z', A', the fissions per unit volume produced in the (Z', A') isotope. To measure P.sub.Z', A', two solid state track recorder fission deposits are prepared from the very same material that comprises the fission neutron dosimeter, and the mass and mass density are measured. One of these deposits is exposed along with the fission neutron dosimeter, whereas the second deposit is subsequently used for observation of background. P.sub.Z', A' is then determined by conducting a second irradiation, wherein both the irradiated and unirradiated fission deposits are used in solid state track recorder dosimeters for observation of the absolute number of fissions per unit volume. The difference between the latter determines P.sub.Z', A' since the thermal neutron cross section is known. F.sub.Z', A' is obtained by using a fission neutron dosimeter for this specific isotope, which is exposed along with the original threshold fission neutron dosimeter to experience the same neutron flux-time history at the same location. In order to determine the fissions per unit volume produced in the isotope (Z', A') as it ingrows during the irradiation, B.sub.Z', A', from these observations, the neutron field must generally be either time independent or a separable function of time t and neutron energy E.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

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