| 摘要 |
PURPOSE:To obtain a radioactive contamination detector capable of shortening measurement time and improving drastically a processing ability. CONSTITUTION:A radioactive detector is provided with a radiation detector 1, a contamination counter means 11 to count the pulse signal output from the radiation detector 1 in a set time, a contamination judgment means 14 which compares the count obtained with the contamination counter means 11 and a contamination regulation level to judge contamination. It also has a background counter means 12 to obtain the background by always counting the signal output from the radiation detector 1 in standby and an optimum count time setting means 13 which takes in the latest background level from the background counter means 12 immediately before the measurement initiation, calculates the shortest count time based on the background level and set the calculated count time in the contamination counter means 11.
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