in bone - the tone marrow calculated alculat inn the the original original recor rerort (NVO MVO-140). we are following the . of Spiers used b r mo ie In ederti t nz this approach, recommendations of the ICRP (ICRP-11) CEAR (22). ga The following text considers the informaticn availatie for estimeatin the doses to the fetvu “co » the newborn, and children relative to adults, and also the dietary changes which are assumed Tor children. 2. Dose tr Fetus The Sr/Ca ratio in the Sr/C2 placental barrier and are. In fact, the ciserved + ae (roi 7’Sr/- Os) (OR = (iol vars = the Ve] Sr/Ca ratio of the Petus the methers’? milk. There is considerable evidence tc show that the CR milk/diet for . . ae 7 33D human breast milk is in the ranse of 0.1 to C.16.°°? . . The sare chserved 23 exists : nae 4 > ayie diet. 3 ratio for the fetus end: newborn relative to the adult i,¢ This ratio has been observed directly and can also be caiculeted from data whi indicate 1.4 that the averase CR tcoay,/ciet Tor adults is 0.25;7°7 wnen this is combined with a further discriminaticn of approximately a factor of 2 across the vlacental or marrary membrane, the range of values Ve - oe ews of O.1 to O.1o for milk or fetus is obtained. } 99 TS