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Radiological implications of NORM in the production of rare-earth compounds

  • J. Barescut, P. P. Haridasan (a1), P. M.B. Pillai (a1), R. M. Tripathi (a1) and V. D. Puranik (a1)...

Abstract

The composite rare earth chloride produced from monazite contain low levels of natural radionuclides and is being used as the input material for the production of individual rare earth compounds which have wide applications. Gross alpha, beta and 228Ra activity concentrations in composite rare earth chloride and individual rare earth compounds such as oxides of Ce, Nd, Pr, Sm, Gd etc are presented. The significant radionuclide of environmental concern is identified as 228Ra and the activity level varied between 0.1 and 7.8 Bq.g-1 in different compounds. Sporadic 228Ra levels up to 16 Bq.g-1 was observed in Lanthanum oxide. The external gamma exposure rates and airborne activity due to thorium and thoron progeny in the process locations are studied. The activity levels in liquid effluent and potential exposure scenarios are indicated.

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[1] Pillai, P.M.B., Naturally occurring radioactive materials (NORM) in the extraction and processing of rare earths. Proc. of Internat. Symp. On Norm, Sevilla, Spain, March 19-22, (2007). IAEA TECDOC.
[2] Lauria, D.C., Elanine.R.R.Rochedo., The legacy of monazite processing in Brazil, Radiat. Prot. Dosimetry, (2005) doi.10.1093/rpd/nci303.
[3] Haridasan, P.P., Studies on occupational inhalation exposures due to Thorium and its progeny in monazite mineral industry. Ph. D.Thesis, University of Mumbai (2002).
[4] International Atomic Energy Agency, Basic Safety Standards. Safety Series No.115 (Vienna: IAEA,1996).
[5] Bhat, I.S., A.G. Hegde, M.A.R. Iyengar, N.N. Dey., Analytical Procedure Manual. BARC/1992/HPD/002.(1992).
[6] International Atomic Energy Agency, Safety Report No.49. Assessing the need for radiation protection measures in work involving minerals and raw materials Vienna, IAEA(2006).

Radiological implications of NORM in the production of rare-earth compounds

  • J. Barescut, P. P. Haridasan (a1), P. M.B. Pillai (a1), R. M. Tripathi (a1) and V. D. Puranik (a1)...

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