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.
Continue reading at Dosimeter of Fukushima citizen counts 40% lower than actual, Maker admits