Number of pulses per unit of time which occur in a radiation detectorDevice or material in which radiation initiates processes su... for other causes than the radiationEnergy dispersion through matter or space. In atomic physics... to be measured. The zero effect essentially consists of cosmic radiationRadiation originating directly or indirectly from extraterre... and the radiationEnergy dispersion through matter or space. In atomic physics... of natural radionuclides on earth.