33 These Indoors the by about gravel al, estimated external rate is 50% in the that is gamma-ray reduced by about 50%. vicinity of immediate spread around dose them rates are Likewise, houses maximal the owing (Shingleton et al, external dosage ones. rate to is the 1987 reduced coral and Robison et 1982b). Other come from In annual cosmic contributions radiation summary, the to (.028 rem) contribution which and medical of fallout in 1978 to are p@ included exposure. the total external . radiation year would .590 dose uncorrected Rongelap for decrease it rem allowing Environmental reduce at this decay estimate the Island shielding by 25% or for within more. The spontaneous such still as decay, leaching ●ore, but of was or 30-year but approximately around rem per which dose would be shielding. radionuclides was not buildings, whole-body not .028 allowed from for. the soil would