The MR-50/EXP series of WanyI technology radiation detector is small in size, light in weight, easy to carry, and can maintain the real-time maximum value, and can be charged online. It is a multifunctional radiation safety monitoring instrument for the staff engaged in contact with isotopes or radiation devices, production and processing materials, import and export products safety radiation, electronic equipment, personal dose monitoring, etc. The instrument at the same time for α, β, γ and X-ray measurement, display unit µSv/h, mR/h, cps, cpm, Total, users can according to the use of the need, set their own dose equivalent rate alarm threshold.