为了对核能设施运行时放出的γ射线进行连续监测,在这些设施周围都设有固定的监测装置,以便在发生核事故时提供出异常剂量率随时间变化等有用资料,但是由于测定地点受到限制,所能测量和评价的剂量率仅局限于某一范围(约1000米)。要想在事故时对较宽范围的剂量率进行快速测最和评价,有效方法是,把探测器装在监测车顶上或由车身引出的支架上,在行驶中进行测量。下称“行驶监测”。 In order to continuously monitor the γ-rays emitted during the operation of nuclear power facilities, fixed monitoring devices are provided around these facilities to provide useful information such as the change of the abnormal dose rate over time in the event of a nuclear accident, but due to the limited location of the measurement site , The dose rate that can be measured and evaluated is limited to a certain range (about 1000 meters). In order to quickly measure and evaluate a wide range of dose rates in the event of an accident, it is effective to mount the detector on a monitor roof or on a stand that is drawn from the body and measure while on the move. Hereinafter referred to “driving monitoring ”.