Individual monitoring for internal contamination with plutonium compounds at JAEA-NCL

This paper provides an outline of an individual monitoring programme for internal contamination with Pu compounds and some of the knowledge obtained from experience of inhalation incidents that occurred over the past few decades at the Japan Atomic Energy Agency, Nuclear Fuel Cycle Engineering Labor...

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Bibliographic Details
Published in:Radiation protection dosimetry 2011-07, Vol.146 (1-3), p.144-147
Main Authors: Kurihara, Osamu, Kanai, Katsuta
Format: Article
Language:English
Subjects:
Contamination
Dose-response effects
Dosimetry
Feces - chemistry
Humans
Inhalation
Laboratories
Lung - drug effects
Nuclear Energy
Nuclear fuels
Occupational exposure
Occupational Exposure - analysis
Physicochemical properties
Plutonium - pharmacokinetics
Plutonium - urine
Plutonium compounds
Radiation Dosage
Radiation Monitoring
Tissue Distribution
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Summary:This paper provides an outline of an individual monitoring programme for internal contamination with Pu compounds and some of the knowledge obtained from experience of inhalation incidents that occurred over the past few decades at the Japan Atomic Energy Agency, Nuclear Fuel Cycle Engineering Laboratories (JAEA-NCL). Most of the incidents resulted in minor exposure doses, being an average of 0.1 mSv at a mixed oxide plant and 1.5 mSv at a reprocessing plant. Only two incidents involving three workers resulted in exposure over the regulatory dose limits of that time. The maximum exposure dose, an effective dose equivalent of 90 mSv, was assessed for a worker involved in the incident that took place at the reprocessing plant in 1993. Only faecal measurements have been used in final dose assessments because alternative monitoring data have rarely been available. Further investigations on the physicochemical properties specific to Pu compounds in workplaces have therefore been needed to improve not only the accuracy of internal dose assessments but also the nasal swab method useful in deciding medical intervention.
ISSN:0144-8420
1742-3406
DOI:10.1093/rpd/ncr139