The GM-100 series Personal dosimeter can quickly detect hard β, γ and X rays in the environment or products in real time, and quickly find radioactive sources. The alarm threshold and dose mode that can be set by the instrument are more suitable for medical protection, nuclear power plant, X-ray machine, radiation leakage and other radiation protection fields. Personal dosimeter has the characteristics of long service life, stable data and good consistency. It has full functions and can set accumulated dose time, alarm value setting, language switching and other functions.