包括读取X射线和/或伽马射线照射，以及在30千电子伏至3兆电子伏的部分或全部范围内工作等仪器。调整、密封、清洁、机械强度、性能、标记和证书的要求。交叉引用:BS 3664取代BS 3385:1961。

Covers such instruments as reading exposure to X- and/or gamma-radiation and working in part or whole of the range from 30 keV to 3 MeV. Requirements for adjustment, sealing, cleaning, mechanical strength, performance, marking and certificate.Cross References:BS 3664Replaces BS 3385:1961.