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. 2021 Aug;36(5):1257-1264.
doi: 10.1002/bio.4051. Epub 2021 Apr 21.

Response of TLD-600/TLD-700 and CR-39 to neutrons for medical dosimetry

Nabil El-Faramawy  1 , Vibha Chopra  2 , Shrouk Rawash  1 , Arafa Abd El-Hafez  3 , Sanjay J Dhoble  4
Affiliations

Response of TLD-600/TLD-700 and CR-39 to neutrons for medical dosimetry

Nabil El-Faramawy et al. Luminescence. 2021 Aug.

Abstract

In this study, thermoluminescence detectors (TLD)-600 and TLD-700 were used under different conditions to study neutron dosimetry for its application in medical dosimetry as albedo dosimeters. 6 LiF has a high cross-section for neutrons and is more sensitive to neutrons than to gamma radiation. Conversely, TLD-700 showed a better response to gamma radiation. Therefore, to obtain the response for neutrons, the responses for TLD-600 and TLD-700 were subtracted. A cadmium sheet was used to absorb incident thermal neutrons so that detector measured only backscattered neutrons from the albedo dosimeter. A Perspex sheet was used as a moderator to thermalize the fast neutron source Am-Be used in the experiment. CR-39 was used to detect fast neutrons and act as an albedo dosimeter when covered with a 10 B disc. Both TLD and CR-39 dosimeters were successful in detecting scattered neutrons in radiotherapy rooms.

Keywords: TLD; medical dosimetry; neutron; phosphor; thermoluminescence.

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