Patent ID: 7217930
Filing Date: 2007-05-15
Classification: G01T

Abstract:
1. A dose detector comprising: a semiconductor radiation detector for outputting a detection signal including noise according to detected nuclear radiations; a first pulse height discriminator for discriminating a first signal with a voltages greater than a predetermined reference detection wave height voltage from the detection signal outputted from the semiconductor radiation detector to remove the noise contained in the detection signal, said first pulse height discriminator outputting a first pulse signal after the noise is removed; a dose counter for counting the first pulse signal from the first pulse height discriminator to output dose count data; a second pulse height discriminator for discriminating a second signal with a voltage greater than a predetermined reference checking wave height voltage from the detection signal outputted from the semiconductor radiation detector, said second pulse height discriminator outputting a second pulse signal including a part of the noise; a check counter for counting the second pulse signal from the second pulse height discriminator to output check count data; and a data processor for receiving the dose count data from the dose counter and the check count data from the check counter, said data processor including a judging unit for judging that the semiconductor radiation detector is normal when the dose count data is smaller than predetermined dose boundary data and the check count data is larger than predetermined lower limit checking data.