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Practical Considerations for TLD-400/700-Based Gamma Ray Dosimetry for BNCT Applications in a High Thermal Neutron Fluence

Steven W. Martsolf, Jennifer E. Johnson, Christopher Vostmyer, E. D. Vostmyer, Barry D. Albertson, S.E. Binney

Abstract

Operating experience with thermoluminescent dosimeters used in a boron neutron capture therapy research project is reported. In particular, certain facets of the use of thermoluminescent dosimeters for gamma ray dose measurements in the presence of a high thermal neutron fluence are discussed, including a comparison of TLD-400 and TLD-700 for gamma ray dosimetry, annealing procedures, and the effects of neutrons (56Mn activation) on TLD-400. The TLD-400 were observed to have a thermal neutron sensitivity (due to 56Mn beta decay) of 1.5 x 10(-13) Gy per n cm-2. An algorithm was developed to correct for the 56Mn beta decay thermal neutron-induced effects on TLD-400 by using a two-stage thermoluminescent readout for the thermoluminescent dosimeter chips.

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Key concepts: Thermoluminescent dosimeter, Thermoluminescence, Dosimeter, Thermoluminescent Dosimetry, Neutron, Radiochemistry, Dosimetry, Neutron temperature