Ordinance on Prevention of Ionizing Radiation Hazards
Ministry of Labour Ordinance No. 41 of September 30, 1972
Latest Amendments:
Ministry of Health, Labour and Welfare Ordinance No. 172 of July 16, 2001
In Japanese
Attached Table (Refer to Articles 3, 28, 29, 30, 31, 32, 33, 39, 41 and 44)
Limits on Surface Contamination
Classification |
Restriction (Bq/cm2) |
Radioisotopes emitting alpha-rays |
4 |
Radioisotopes not emitting alpha-rays |
40 |
Remarks: Unit of restriction Bq/cm2: Becquerels per square centimeter
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