Dosimeter of Fukushima citizen counts 40% lower than actual, Maker admits

On 1/28/2015, “CHIYODA TECHNOL CORPORATION [URL]” announced on their website that their dosimeter shows cumulative exposure dose lower than actual air dose rate by 30 〜 40%.

Fukushima citizens are given the dosimeter of this company, which is the largest “glass badge” maker. The citizens wear these dosimeter to measure the individual cumulative radiation dose in a certain period.

Having a company executive apologize it in the city council of Da-te city in mid January, they officially announced this fact on their website.

The dosimeter counts γ ray only when it comes to the front of the badge. In the circumstance where γ ray comes in all the direction, it shows only 60 〜 70% of the actual radiation dose.

The maker states it is not unrealistic because most of the highly radiosensitive organs are in the front of human body.

http://www.c-technol.co.jp/archives/1038

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Source: Fukushima