| 摘要 |
PURPOSE: To provide a radiation dosimeter in which a detector is not easily damaged and by which a dose equivalent can be found precisely even for low- energyβ-rays. CONSTITUTION:β-rays which have passed an incident-window protective plate 70a are detected by a detection part 20 not comprising a filter and a detection part 30 comprising a filter 30c. Detection signals of the detection parts 20, 30 are amplified and pulse-height-discriminated so as to be counted respectively by counters 26, 36. An arithmetic circuit 42 receives respective counted values of the counters 26, 36, it finds the ratio of the counted values, and it finds the energy of theβ-rays corresponding to the ratio of the counted values from a sensitivity-ratio table which is stored in a memory 44. In addition, the arithmetic circuit 42 finds the sensitivity of the detection part 20 or 30 corresponding to the energy of theβ-rays found from an energy characteristic table which is stored in the memory 44, it corrects the counted value of the detection part 20 or 30 on the basis of the sensitivity, and it computes a dose equivalent.
|
