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The gamma component of air radiation dose rates is a function of the amountand spread of radioactive nuclides in the environment. These radionuclides canbe natural or anthropogenic in origin. The field of view describes the area ofradionuclides on, or below, the ground that is responsible for determining theair dose rate, and hence correspondingly the external radiation exposure. Thiswork describes Monte Carlo radiation transport calculations for the field ofview under a variety of situations. Presented first are results for natural 40Kand thorium and uranium series radionuclides distributed homogeneously withinthe ground. Results are then described for atmospheric radioactive caesiumfallout, such as from the Fukushima Daiichi Nuclear Power Plant accident.Various stages of fallout evolution are considered through the depthdistribution of 134Cs and 137Cs in soil. The fields of view for the naturalradionuclides and radiocaesium are different. This can affect the responses ofradiation monitors to these nuclides if the detector is partially shielded fromthe ground within its field of view. The field of view also sets the maximumreduction in air dose rates that can be achieved through local decontaminationor remediation measures. This maximum efficiency can be determined quickly fromthe data presented here for the air dose rate versus the spatial extent ofradioactive source on the ground.

Fields of View for Environmental Radioactivity