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Radiation Protection Dosimetry Advance Access originally published online on August 6, 2007
Radiation Protection Dosimetry 2008 128(3):266-273; doi:10.1093/rpd/ncm385
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Studies on the response of the TLD badge for high-energy photons

Munish Kumar1,*, R. K. Kher1, G. Sahni2 and Kanta Chhokra2

1 Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai 400 085, India
2 Radiological Safety Division, Atomic Energy Regulatory Board, Mumbai 400 094, India

* Corresponding author: munish_pms{at}rediffmail.com

Received December 19, 2006, amended June 25, 2007, accepted June 26, 2007

Absorbed tissue dose measurements are carried out for high-energy photon beams using CaSO4:Dy thermo-luminescence dosemeter (TLD) badge and the results are also verified using ionisation chamber used in radiation therapy. The photon beams generated using linear accelerator at 6 and 18 MV photon beam energies have been used and the absorbed doses are measured at the surface as well as at various depths. It has been found that the depth at which maximum dose is delivered increases with the increase in photon energy and the depth of maximum absorbed dose in tissue occurs beyond 10 mm. It has also been found that the evaluation of the absorbed dose (or Hp(10) as well) using thermoluminescence readout of disc D1 clearly shows that the current TLD badge provides a reasonable estimate of the effective dose for photon fields from 6 to 18 MV linacs for anterior–posterior incidence. The paper also provides information regarding the misinterpretation of radiation pattern in multi-element/filter TLD badge.


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