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Radiation Protection Dosimetry Advance Access originally published online on June 10, 2008
Radiation Protection Dosimetry 2008 131(2):217-221; doi:10.1093/rpd/ncn170
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Occupational radiation exposure due to norm in a rare-earth compounds production facility

P. P. Haridasan*, P. M. B. Pillai, R. M. Tripathi and V. D. Puranik

Environmental Assessment Division, Bhabha Atomic Research Centre, Health Physics Unit, Indian Rare Earths Limited, Udyogamandal, Alwaye 683501, Kerala, India

* Corresponding author: haripadmam{at}gmail.com, haridas67{at}rediffmail.com

Received March 8, 2008, amended April 26, 2008, accepted April 30, 2008

In India, rare-earth compounds are produced from the beach sand mineral monazite. Caustic digestion of the mineral followed by selective acid extraction is the method used to separate composite rare-earth fraction. The composite rare-earth chloride contains low levels of natural radionuclides and is the starting material for individual rare-earth compounds which have wide applications. Activity concentrations in composite rare-earth compounds such as chlorides, fluorides, carbonates and oxides of Ce, Nd, Pr, Sm, Gd, etc. are presented in this paper. The external gamma exposure rates and airborne activity due to thorium and thoron progeny in the occupational environment are studied. The activity levels in liquid effluent are presented. The potential individual occupational dose is estimated to be 1.9 mSv per annum.


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