| 摘要 |
PURPOSE:To achieve the calibration for the measurement of radiation at a high efficiency with a fixed accuracy and without increase in the dose of expose to workers by controlling the time of radiation irradiating action with the memory of a time setting data. CONSTITUTION:An ascent start time, irradiation time and the like set for a radiation source 11 of an irradiator 200 through an operation part 121 is stored in a memory circuit 119 and a control signal is applied to a control circuit 139 from the circuit 119 according to an arribal time signal with a timer 133. With the control of a step motor 219 of the irradiator 200 by the circuit 139, the radiation source 11 ascends from a shield section and stopped at the irradiation position through a rotary encoder 223 while an actual irradiation start time is stored into the circuit 119 through the circuit 139. Then, as soon as detection value of dose of an alarm dosimeter 10 reaches a set value of a setting section 21, an alarm signal is generated while the time is stored in the circuit 119. Then, when the set irradiation time is reached, the radiation source 11 is lowered. This automatic operation and memory enables the calibration for the radiation measurement at a high efficiency with a fixed accuracy without increase in the dose of exposure to workers. |
