Limitations of the paired LiF TLD-600, 700 technique for the estimation of gamma ray dose in mixed n-γ radiation fields: The effect of thermal neutrons

Y. S. Horowitz; S. Freeman; A. Dubi

doi:10.1016/0029-554X(79)90609-8

Limitations of the paired LiF TLD-600, 700 technique for the estimation of gamma ray dose in mixed n-γ radiation fields: The effect of thermal neutrons

Y. S. Horowitz, S. Freeman, A. Dubi

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Abstract

Two significant limitations of the paired LiF thermoluminescent (TL) technique for the determination of γ dose in mixed n-γ radiation fields are discussed. These are; (i) the likelihood of large variations in the behaviour of the TL sensitivity as a function of neutron energy from dosimeter batch to dosimeter batch due to minute variations in the dosimeter preparation and (2) the likelihood of large absorbed dose in TLD-600 due to thermal neutrons (compared to the fast neutron or γ dose) resulting in the necessity of a third independent experimental dose or fluence measurement of the thermal neutrons. It is estimated that for radiation fields where φ_th φ_f > 0.05, even the angular distribution of the thermal neutrons at the point of interest must be determined to enable adequately accurate calculation of the thermal neutron selfshielding factor in TLD-600.

Original language	English
Pages (from-to)	317-320
Number of pages	4
Journal	Nuclear Instruments and Methods
Volume	160
Issue number	2
DOIs	https://doi.org/10.1016/0029-554X(79)90609-8
State	Published - 15 Mar 1979

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title = "Limitations of the paired LiF TLD-600, 700 technique for the estimation of gamma ray dose in mixed n-γ radiation fields: The effect of thermal neutrons",

abstract = "Two significant limitations of the paired LiF thermoluminescent (TL) technique for the determination of γ dose in mixed n-γ radiation fields are discussed. These are; (i) the likelihood of large variations in the behaviour of the TL sensitivity as a function of neutron energy from dosimeter batch to dosimeter batch due to minute variations in the dosimeter preparation and (2) the likelihood of large absorbed dose in TLD-600 due to thermal neutrons (compared to the fast neutron or γ dose) resulting in the necessity of a third independent experimental dose or fluence measurement of the thermal neutrons. It is estimated that for radiation fields where φth φf > 0.05, even the angular distribution of the thermal neutrons at the point of interest must be determined to enable adequately accurate calculation of the thermal neutron selfshielding factor in TLD-600.",

author = "Horowitz, {Y. S.} and S. Freeman and A. Dubi",

note = "Funding Information: '* Partially supported by International Atomic Energy Agency Research Contract 1614/RB. t In partial fulfillment for the requirements of the M.Sc. De-gree in Physics. * Present address, Los Alamos Scientific Laboratories, Group T-I, Los Alamos, New Mexico, U.S.A.",

year = "1979",

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doi = "10.1016/0029-554X(79)90609-8",

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T1 - Limitations of the paired LiF TLD-600, 700 technique for the estimation of gamma ray dose in mixed n-γ radiation fields

T2 - The effect of thermal neutrons

AU - Horowitz, Y. S.

AU - Freeman, S.

AU - Dubi, A.

N1 - Funding Information: '* Partially supported by International Atomic Energy Agency Research Contract 1614/RB. t In partial fulfillment for the requirements of the M.Sc. De-gree in Physics. * Present address, Los Alamos Scientific Laboratories, Group T-I, Los Alamos, New Mexico, U.S.A.

PY - 1979/3/15

Y1 - 1979/3/15

N2 - Two significant limitations of the paired LiF thermoluminescent (TL) technique for the determination of γ dose in mixed n-γ radiation fields are discussed. These are; (i) the likelihood of large variations in the behaviour of the TL sensitivity as a function of neutron energy from dosimeter batch to dosimeter batch due to minute variations in the dosimeter preparation and (2) the likelihood of large absorbed dose in TLD-600 due to thermal neutrons (compared to the fast neutron or γ dose) resulting in the necessity of a third independent experimental dose or fluence measurement of the thermal neutrons. It is estimated that for radiation fields where φth φf > 0.05, even the angular distribution of the thermal neutrons at the point of interest must be determined to enable adequately accurate calculation of the thermal neutron selfshielding factor in TLD-600.

AB - Two significant limitations of the paired LiF thermoluminescent (TL) technique for the determination of γ dose in mixed n-γ radiation fields are discussed. These are; (i) the likelihood of large variations in the behaviour of the TL sensitivity as a function of neutron energy from dosimeter batch to dosimeter batch due to minute variations in the dosimeter preparation and (2) the likelihood of large absorbed dose in TLD-600 due to thermal neutrons (compared to the fast neutron or γ dose) resulting in the necessity of a third independent experimental dose or fluence measurement of the thermal neutrons. It is estimated that for radiation fields where φth φf > 0.05, even the angular distribution of the thermal neutrons at the point of interest must be determined to enable adequately accurate calculation of the thermal neutron selfshielding factor in TLD-600.

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DO - 10.1016/0029-554X(79)90609-8

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SN - 0029-554X

VL - 160

SP - 317

EP - 320

JO - Nuclear Instruments and Methods

JF - Nuclear Instruments and Methods

IS - 2

ER -

Limitations of the paired LiF TLD-600, 700 technique for the estimation of gamma ray dose in mixed n-γ radiation fields: The effect of thermal neutrons

Abstract

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