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Title

OCCUPATIONAL RADIATION EXPOSURE DUE TO NORM IN A RARE-EARTH COMPOUNDS PRODUCTION FACILITY.

Authors

Haridasan, P. P.; Piillai, P. M. B.; Tripathi, R. M.; Puranik, V. D.

Abstract

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 tlioron 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.

Subjects

INDIA; FACILITIES; RADIATION exposure; RARE earth oxides; THORIUM; RADIOACTIVE substances

Publication

Radiation Protection Dosimetry, 2008, Vol 131, Issue 2, p217

ISSN

0144-8420

Publication type

Academic Journal

DOI

10.1093/rpd/ncn170

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