17 TABLE 3 #1 Radionuclide SOURCES OF FALLOUT RADIATION AT RONGELAP Half- life a/ years Principal radiations#/ A__ b/ - c/ MeV MeV 7c,d/ MeV ICRP-derived limit on dai}y oral intake raction sorbed from gut in adults / pci/d*/ Cesium-137 30 - 0.187 - 66 9860 * 5920 ** Strontium-90 29 - 1.13 - 2470 * 1.0 ° 1480 ** ° 3 Plutonium-239 24,065 5.23 - - 30 ** (60) -001 -240 6,537 5.24 - - 30 ** (60) 001 Americium-241 432 §.57 - - 37 ** (67) 001 a/ ICRP Publication 38. (Radionuclide transformations) b/ Quality factor, 20 c/ Quality factor, 1 d/ X and gamma rays are omitted whose total contribution to dose wogld be less than 10%. Derived from ICRP Publications 30 and 48. The ICRP limit on intake for workers was divided by 30 (*) to bring the annual committed effective dose-equivalient to 170 mrem, or by 50 (**) for 100 mren. The RP linit includes a factor of 2 to prevent any one tissue receiving nora than 50 rem. That factor is unnecessary in the present low-dosage cas The numbers in parentheses give the applicable guide without such correction.* £/ ICRP Publication 30. Supplement to Part 1. (Annals, Vol. 3), Publication 48 for transuranics. d ICRP *John Dunster adds: The intake limits apply to adults. For clildren, the strontium limit should be divided by a factor of about 3, ad those for plutonium and americium by about 2. (National Radiation Pr tection Board G 87, hug 87.)