| 摘要 |
PURPOSE:To achieve a higher accuracy of calculating dose rate, by combining the correction of an input exponential value produced by adding a constant thereto with the correction by gain and bias of an amplifier within a dose rate meter. CONSTITUTION:An input proportional to the logarithmic value of a dose rate is subjected to two corrections, the one by multiplying the logarithmic value constant times by a gain and a bias of an amplifier within a dose rate meter 7 and the other by adding a constant thereto and additional correction is done for any leaked current attributed to a resistance 3 and a capacitor 2 between a cable A between a radiation detector 1 and a preamplifier 4 and the ground. In other words, the current signal outputted from the detector 1 is amplified with an amplifier 4 and the amplification of the current signal thereof is done with a logarithmic amplifier 5, which outputs a voltage proportional to the logarithmic value of the input signal to be inputted into a dose rate meter 7, which is made up of a CPU, a memory and an input/output section. The output voltage signal of the amplifier 5 is converted into a dose rate by a software. The three resulting correction values are determined by a specified correction factor calculating formula based on the three irradiations at a reference dose rate and then the dose rate is shown on a display 8.
|
