... mainly used for personal dose X, γ-ray and hard to monitor β-ray radiation protection for nuclear power plants, ... , the instrument is simple, easy to use 2. cumulative dose and dose rate measurements show 3 ... 15. measuring time: measuring time automatically selected based on ray intensity, faster response 16. alarm threshold: 0.5,1 ... .0,2.5,10,30,50,100,500 μSv / ...