Abstract: A radiation detector obtains radiation information by detecting a light pulse occurred in response to a radiation in a scintillation fiber at one end or opposite ends of the scintillation fiber. The scintillation fiber is surrounded by a scattering member which emits an electron by interaction with the radiation.

Abstract: The invention is concerned with a digital ratemeter comprising a count difference circuit for adding input pulse signals and subtracting the frequency of the divider pulse, an integrator for integrating positive or negative count values from the count difference circuit, a feedback unit for receiving an integral count value from the integrator as input, thus generating a divider pulse frequency, and performing exponential transformation of the divider pulse frequency, whereby the integral count value is a count rate output and a fixed measurement accuracy in the overall range is attained.