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Radiation Protection Dosimetry Advance Access originally published online on January 25, 2006
Radiation Protection Dosimetry 2006 121(2):92-98; doi:10.1093/rpd/nck003
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Determination of dose-build-up thickness for absorbed dose measurement in high energy electron-photon radiation at electron storage rings

Haridas G. Nair*, Vipin Dev1, M. K. Nayak1, K. K. Thakkar1, P. K. Sarkar2 and D. N. Sharma2

1 Health Physics Unit, Centre for Advanced Technology, Indore 452 013, India
2 Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai 400 085, India

* Corresponding author: haridas{at}cat.ernet.in

Received October 7, 2005, amended December 9, 2005, accepted December 20, 2005


  Abstract

Radiation field during accidental electron beam loss near electron storage rings comprises of high-energy electrons and bremsstrahlung photons. Due to high-energy nature of the radiation, the absorbed dose is expected to build up with depth of the body of an exposed worker and hence absorbed dose measurements in 30 cm water/tissue equivalent phantom is essential. Carrying out the measurements with in such phantoms is not practically feasible for routine applications and hence the use of an equivalent solid material around the dosemeters would be convenient. Monte Carlo calculations have been carried out in order to determine the dose-build-up thickness required in copper and lead, corresponding to the maximum absorbed within 30 cm depth of water in such radiation fields. Equivalent build-up thickness calculated for a case was verified by measurement using an ion chamber detector. The results are found to be in agreement within ±20%.


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