The High-Radiation Lives and Risks of Nuclear-Nomad Subcontractors

The IAEA Status Report 2 November 2011 contains a table of worker exposures. In March 2011, 98 workers (out of 3742) received more than 100 mSv. But that was related to the initial disaster. By September 2011, 7 workers received between 20-50 mSv, the other 1039 workers received far less. The average dose to workers in September was only 1.80 mSv (people in Denver get 12 mSv a year).

Even if there are "hidden" unmeasured gypsy workers, their doses could not be highly in excess of permanent salaried workers, unless they go swimming the spent fuel pools. The radiation levels at Fukushima Daiichi is now far lower then it was in March, so it's very hard to accumulate high doses unless you enter the reactor buildings. It's likely those few who enter the reactors are the trained staff conducting surveys and they well monitored.

The Japanese introduced the GD-450 (glass badge) radiation dosimeter about 10 years ago, it's manufactured by Chiyoda Technol Corporation and is used throughout Japan's nuclear industry and hospitals etc. Dosimetry measurements are, from what I read, uploaded to a central computer (FGD-650 reader and server computer system). The badges contain the users ID printed on two stickers, one on the front and another on metal frame hidden inside the badge, presumably to prevent tampering.

They handed out 230,000 glass badges to civilians in Fukushima Provence last September, so clearly the centralised system can handle large numbers. For example, 36,767 glass badges handed out in Fukushima City revealed an average dose of 0.26 mSv over 3 months. I'm pretty sure this survey is run by the Japanese Ministry of Health, it would be easy to share the worker data if it's not already.

Refs:
The Large Scale Personal Monitoring Service Using The Latest Personal Monitor GLASS BADGE Norimichi Juto
IAEA Fukushima Daiichi Status Report 2 November 2011 (see table 3).

Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/O2T2o56r9Jw/the-high-radiation-lives-and-risks-of-nuclear-nomad-subcontractors

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