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Radiation Protection Dosimetry 2004 110(1-4):613-617; doi:10.1093/rpd/nch162
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Radiation Protection Dosimetry Vol. 110 Nos. 1-4 © Oxford University Press 2004; all rights reserved

Thermoluminescence dosimetry in mixed neutron/gamma radiation beam

M. Yudelev1,*, S. Hunter2 and J. B. Farr3

1 Karmanos Cancer Institute and Wayne State University, 3990 John R. Street, Detroit, MI 48201, USA
2 St. Joseph Mercy Hospital, Ann Arbor, MI, USA
3 Midwest Proton Radiotherapy Institute, Indiana University Cyclotron Facility, Bloomington, IN 47401, USA

* Corresponding author: myudelev{at}dmc.org

Miniature CaF2:Tm (TLD-300) were adopted for dosimetry in a mixed neutron/gamma beam produced by the Detroit superconducting cyclotron. A method utilizing the linear relationship between the ratios of the areas under the low and high temperature peaks of the glow curve and the ratios of gamma dose to total dose (D{gamma}/DT) in d(48.5)+Be fast-neutron beam was applied for both the gamma component and the total dose measurements. The detectors were grouped based on their response to uniform 60Co dose. Within each group the ratio of the peak areas of the glow curve demonstrated uniformity and stability better than 1.5% (one standard deviation). The parameters of the linear regression between the fractional gamma component in the neutron beam and the ratio of peak areas were derived from measurements at locations with predetermined D{gamma}/DT. The method was applied to measure the transmission through the existing multi-rod and newly designed multi-leaf collimators.


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