... device is mainly used for personal dose X, γ-ray and hard to monitor β-ray radiation protection for nuclear power plants, accelerators, ... and cumulative dose. It uses the power of new chip technology, the detector is compensated by the GM counter, the instrument ... ≤ ± 10% 15. measuring time: measuring time automatically selected based on ray intensity, faster response 16. alarm threshold: 0.5,1.0 ...