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Radiation Protection Dosimetry Advance Access originally published online on October 6, 2005
Radiation Protection Dosimetry 2006 118(3):233-237; doi:10.1093/rpd/nci353
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Dose build up correction for radiation monitors in high-energy bremsstrahlung photon radiation fields

Haridas G. Nair1,*, M. K. Nayak1, Vipin Dev1, K. K. Thakkar1, P. K. Sarkar2 and D. N. Sharma2

1 Health Physics Unit, Centre for Advanced Technology, Indore 452013, India
2 Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai 400085, India

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

Received June 22, 2005, amended August 28, 2005, accepted September 6, 2005

Conventional radiation monitors have been found to underestimate the personal dose equivalent in the high-energy bremsstrahlung photon radiation fields encountered near electron storage rings. Depth-dose measurements in a water phantom were carried out with a radiation survey meter in the bremsstrahlung photon radiation fields from a 450 MeV electron storage ring to find out the magnitude of the underestimation. Dose equivalent indicated by the survey meter was found to build up with increase in thickness of water placed in front of the meter up to certain depth and then reduce with further increase in thickness. A dose equivalent build up factor was estimated from the measurements. An absorbed dose build up factor in a water phantom was also estimated from calculations performed using the Monte Carlo codes, EGS-4 and EGSnrc. The calculations are found to be in very good agreement with the measurements. The studies indicate inadequacy of commercially available radiation monitors for radiation monitoring within shielded enclosures and in streaming high-energy photon radiation fields from electron storage rings, and the need for proper correction for use in such radiation fields.


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