| 摘要 |
PROBLEM TO BE SOLVED: To measure positional information and radioactivity accurately by receiving signals from a plurality of distributed radio transmitters every time when a radiation measuring unit movable in a work area performs a measurement thereby obtaining the information of measuring position. SOLUTION: A radiation measuring unit employs a portable dosimeter, e.g. an ionization chamber survey meter or a patrol meter, having a radiation measuring section and a radio receiving section. At least three radio transmitters 7-10 are provided on each operation floor 1 and the radio receiving section receives radio signals 11-14 from the transmitters 7-10 and calculates an angle and a distance thus determining a radioactivity measuring point 6. The survey meter comprises a memory for storing the radiation measurements and the position of the measuring point 6. Since a plurality of transmitters 7-10 are provided, an obstacle existing at an intermediate position can be covered by other signals. According to the arrangement, the measuring point 6 can be determined accurately and automatically.
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