... rate of relevant national standard. BS9521 X, Y Ray Radiation Dose MeterTechnical Parameters DetectorNaI(Tl)Energy range35keV~3MeVEnergy ... environment protection, injury detecting, metallurgy, oil, chemical industry and radioactive lab, radiation source management, commercial inspection, in-out ... can be used in various bad circumstances and outdoors. Portable Realtime X Ray, Y Ray Radiation Dose Meter