s~ i] TABLE an INFORMATION FOR CALCULATING MAXIMUM INTERNAL ANNUAL DOSES a Radionuclide 1 : Tnex Critical Organ 90, b Tex +8 yr (yrs) Bone Whole Body 1.83 VES weeee ee ee ° ee Lung 19.00 - Factor L/K 22 30 23.10 18,22 25. 65 0.0433 30 2keui 0.0474 0.0397 - 22 30 25.17 - 30 28.01 10 , K 30 13 Pu (yrs) - « 137... Dose Period r {yrs} 4.82 Dose Conversion 17, 75 0.0549 0.0390 0.0563 0.0357 “rhe time at which the internal exposure rate becomes maximum for a particular radionuclide and target organ is denoted by Tnax’ and is calculated from the formula T max = fn ()_/_) r m h m =X r ’ . —_ ‘ where yy is the biological decay constant for man, and A, is the radioactive decay constant for the radionuclide. bassumed 8-year maturation periods for pandanus, breadfruit, and coconut seedling trees. “rhe period of time over which the dose rate is integrated is denoted by T. ' | Gan empirical factor used to relate the maximum annual dose to an integrated dose for a longer period is denoted by K. The relation is given by D . T max’ Dr K° " The factor K is determined from equations given in NVO-140, pp, 537-38. + seen