Their beta ray counter indicated levels above the evacuation benchmark of 5 millisieverts per hour, but the workers did not evacuate and continued repairs.
Beta rays can not easily penetrate the skin and the legal limit of exposure in case of emergency is 1,000 millisieverts per hour.
The 4 workers’ level of exposure is believed to have been 9.5 millisieverts at maximum, which poses no immediate health risks.
The plant’s operator, Tokyo Electric Power Company, is looking into why the workers failed to leave despite hearing an alarm.
It has also begun checking 17 other people who were working nearby for exposure to beta rays.
Late last month, 2 Tokyo Electric workers were exposed to high levels of beta rays. Another 2 workers were contaminated when they were accidentally sprayed with radioactive wastewater.
- Mainichi: Fukushima nuke plant workers blasted with beta radiation (enenews.com)
- Fukushima Updated: 3 Fukushima nuke plant workers blasted with beta radiation (enformable.com)
- Japan:Plant workers fail to evacuate despite exposure (laaska.wordpress.com)
- TEPCO has not set worker exposure limits for beta radiation almost 6 months after Fukushima Disaster (enformable.com)
- Fukushima disaster: Workers reveal they were in the dark about meltdown and radiation exposure limits (enformable.com)
- TEPCO Blames Fukushima nuke plant workers irradiated on job (enformable.com)
- Enformable September 2nd 2011 (news.lucaswhitefieldhixson.com)
- Shocking Reports As Covert Trip to Fukushima Nuclear Power Plant Reveals New Security Problems (enformable.com)
- Over 101,000 Fukushima residents unable to return to homes anytime soon – Some locations estimated over 500 mSv per year (enformable.com)
- Japanese Government ‘Missteps’ Allowed Citizens To Be Exposed to Radiation on “Worst Possible Day” (enformable.com)