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A simple method of generating physical random digits is described. In this method, an electronic decade counter is incremented by the clock pulses. As the overflow is ignored, the counter keeps counting from 0 to 9. Whenever a micro-computer is interrupted by a rare random signal caused by a radiant ray detection, a digit in the counter is latched and loaded in the memory. These digits are used as the random numbers of one figure or several figures. This method is the most simple one of the traditional methods. A mathematical estimation for the occurrence probabilities of each digit suggests that the maximum deviation from the equiprobabilities 1/10, is less than (6×10^<-9>).
