Table 6.

Standards for dose and concentration limits for medical radioisotope rooms

Rooms	Medical Care Act
Rooms	Medical radioisotope rooms
	Storage facilities
	Disposal facilities
	Radiotherapy rooms
Dose and concentration limits in controlled areas	・Effective dose of external radiation: 1.3 mSv per 3 months ・Concentration of radioisotope (RI) in the air: The average concentration in 3 months is 1/10 of the concentration limit of the RI in the air ・Surface density of substances contaminated by RI: 1/10 of the surface density limit (alpha ray-emitting RI: 0.4 Bq/cm2, non-alpha ray-emitting RI: 4 Bq/cm2)
Dose and concentration limits in regular thoroughfares in RI facilities	・Effective dose outside the wall: 1 mSv per week ・RI concentration in air: the average weekly concentration is the RI concentration limit in air ・Surface density of substances contaminated by RI: Area density limit (alpha ray-emitting RI: 4 Bq/cm2, non-alpha ray-emitting RI: 40 Bq/cm2)
Dose standards at the boundaries of hospitals (including residential areas inside the hospital)	Effective dose: 250 μSv per 3 months
Exposure dose of in-patients	Effective dose should not exceed 1.3 mSv per 3 months