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Radiation Protection Dosimetry Advance Access originally published online on July 25, 2008
Radiation Protection Dosimetry 2008 131(4):487-494; doi:10.1093/rpd/ncn195
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Assessment of radiological significance of naturally occurring radionuclides in soil and rock matrices around Kakrapar environment

A. K. Patra1,*, T. J. Jaison1, A. Baburajan2 and A. G. Hegde3

1 ESL (ESS, Health Physics Division, BARC), Kakrapar Atomic Power Station, P.O. Anumala, Surat District, Gujarat-394651, India
2 ESL (ESS, Health Physics Division, BARC), Tarapur Atomic Power Station, TAPS colony, P.O. TAPP, Thane District, Maharashtra-401504, India
3 Health Physics Division, BARC, Mumbai-400 085, India

* Corresponding author: akpatra{at}npcil.co.in

Received April 1, 2008, amended June 20, 2008, accepted June 30, 2008

The activity and gamma-absorbed dose rate due to the naturally occurring radionuclides in the terrestrial environment such as 238U, 232Th and 40K were determined in soil and rock samples collected around Kakrapar Atomic Power Plant site, using gamma-ray spectrometry. The mean concentration levels measured in Kakrapar soil from naturally occurring radioisotopes such as 238U, 232Th and 40K are lower than the corresponding global average values obtained in worldwide soil. The external hazard index (Hex) and absorbed gamma dose rate in air outdoors is observed to be 0.04–0.18 and 3.1–14.1 nGy h–1, respectively.


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