83 N-10 Studies on intake by inhalation concentrated on Island (Shinn et al 1980). In plutonium-239,-240 at Bikini it was assumed that a person would be calculating the results, exposed to maximum dust conditions for 5 hours per day throughout life (tilling fields), an unrealistic assumption bound to give very high exposures (tilling deposits 1.5 x 10-s picocuries per hour in the lungs). To obtain (1982b) that the the was practically the the inhalation-dose transuranic specific Island. of Bikini Island Rongelap dose, distribution it was of particle assumed sizes et al by Robison and of radionuclides Therefore, same on Bikini and Rongelap Islands. as the on Rongelap would be to that on Bikini activity of Rongelap soil (O-5 cm) was to that Specific activity top 5 cm of soil in 1978 in Inhalation 30-year dose to bone marrow c/ rem pCi/g Bikini a/ plutonium-239,-240 americium-241 Rongelap b/ plutonium-239, americium-241 a/ b/ c1 -240 11 8.7 .033 .035 3.2 1.0 .010 .005 Robison et al (1982a, pp. 8, 12, 44, 56). Robison et al (1982b, pp. 12, 14, 47, B1O, B13). The dose throughout the bone would be about 4 times The a factor period to be dose is greater for a growing child. of 2.8 to convert the adult inhalation rem). 0-30 years (.042 The dose to the about 2.5 tines that to the marrow. as great. Robison et al dose to that adult lung is (1982a) used for the age considered Dr. Robison (personal communication, 1988) has reviewed these dose ICRP factors. estimates according to the more recent lie has reduced dust consumption by a factor of 3.5, which would reduce the dose proportionally. This is still a liberal allowance for every day of life to death, but in any case a much more reasotile one. The net from birth result is a reduction in dose for plutonium by a factor of about 3, and for americium by a factor of 4.