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

Research output: Contribution to journalArticlepeer-review

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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 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.

Original languageEnglish
Pages (from-to)317-320
Number of pages4
JournalNuclear Instruments and Methods
Volume160
Issue number2
DOIs
StatePublished - 15 Mar 1979

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