Document Detail


Occupational exposure to natural radiation in zirconium refractory plants in Japan.
MedLine Citation:
PMID:  23274817     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
ABSTRACT: The authors measured the ambient dose rate and activity concentration of natural radionuclides in raw materials, products, and aerosols on worksites, as well as the Rn and Rn concentrations in an unshaped refractory, a shaped refractory, and an electrocast refractory plant processing zirconium ore in Japan. Estimations were made of the effective doses to plant workers. The activity concentration of the U series in raw materials and products in the refractory plants was higher than the critical values (10 Bq g for K and 1 Bq g for all other radionuclides of natural origin) specified in the International Atomic Energy Agency Safety Guide. The ambient dose rate in the raw material warehouse of the electrocast refractory plant was 0.75 μSv h, which was the highest among all the worksites at all the refractory plants studied. The activity concentrations of aerosols in the product-output site of the unshaped refractory plant was 0.0015 Bq m for U and 0.00078 Bq m for Th, which were the highest of all the worksites for all refractory plants. The indoor Rn and Rn concentrations in all worksites of all the refractory plants were almost the same levels as those in everyday indoor places in Japan. The maximum value of the effective dose to workers was 430 μSv y, which was lower than the intervention exemption level (1,000 μSv y) specified in ICRP Publication 82.
Authors:
Kazuki Iwaoka; Hiroyuki Tabe; Toshikazu Suzuki; Hidenori Yonehara
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Health physics     Volume:  104     ISSN:  1538-5159     ISO Abbreviation:  Health Phys     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2012-12-31     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985093R     Medline TA:  Health Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  151-7     Citation Subset:  IM    
Affiliation:
*Research Center for Radiation Protection, National Institute of Radiological Sciences 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan.
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