A multichannel dosimeter with high precision P-Si semiconductor detectors is introduced. The meter has been applied in the field of radiation for on-line or real-time examination. Besides

in nuclear medicine it can be also used to monitor and measure the dose when patients are under the radiation therapy. The instrument is primarily operated

and some of its characteristic are as follows:the sensitive energy range for X-ray is between 0.1 and 15 MeV

the detection sensitivity is 0.05 Gy/min

the input bias current is about 50×10-15 A

and its linearity is ideal. Moreover

the printer and LCD are attached to the meter to increase its intelligence.