To determine the amount of the scatter radiation in diagnostic radiology rooms, authors performed the measurement of scatter ray by film badge method in 28 sites in 12 radiology rooms (17 in the room, 11 behind the protective barrier) for 4 weeks, and calculated the amount of expected radiation exposure for one year. All measurements did not exceed the maximal permissible dose (MPD) of the occupational exposure (50 mSv/year) or the definition dose of the radiation area (0.3 mSv/week). As a conclusion, diagnostic radiology room in SNUH can be regarded as a safe area so far as the current standard of the MPD is valid. But, as the effect of the low level radiation is still controversial, the efforts to reduce the amount of the personal exposure using protective device or equipment should be done continuously.