Patent ID: 7139354

Claim:
A device for measuring radiation comprising: a radiation detector which generates an analog signal containing pulse components corresponding to a dosage of an inputted radiation; an A/D converter which converts the analog signal into sampled data; a band pass filter which limits the sampled data outputted from the A/D converter within a predetermined frequency band to generate restricted sampled data; an n-th power calculation unit which calculates the n-th power values of the restricted sampled data outputted from the band pass filter, where n is an integer of not less than two; a first smoothing unit which equalizes the n-th power values of the limited sampled data outputted from the n-th power calculation unit within a first time width to generate a first smoothed n-th power value; a data removal equalization unit which evaluates sizes of the first smoothed n-th power values outputted from the first smoothing unit within a second time width, removes a predetermined data removal number of the first smoothed n-th power values based on the evaluation result, and equalizes the first smoothed n-th power values after the removing within the second time width to generate a second smoothed n-th power value; a second smoothing unit which equalizes the equalized n-th power values outputted from the data removal equalization unit to generate a third smoothed n-th power value; and a converter which converts the third smoothed n-th power value outputted from the second smoothing unit into a radiation intensity of the inputted radiation.