Se ea 32 4.4 Infant Dosage The following factors should be taken into account. The infant during the first six months may absorb from the gut a much great fraction of radionuclide than the adult. The residence time of radionuclide in the body may be shorter than in the adult. For residence times, the amount retained is diluted by growth. eats less than the adult. Jonger The @nfant In the case of cesium-137, which is completely absorbed from the gut in both infant and adult and whose residence time is short, the difference between adult and infant dose factors will be small. [For plutonium-239, whose absorption by the infant is much greater and whose residence time is long, an appreciable difference can occur. Hofever, because the transuranic contribution to the adult dose is so smajl, even if it be increased very appreciably in the infant, it will not necessarily be quantitatively important. Balancing these variables against one another leads to the following committed dose factors (rem per picocurie daily intake) for wholb-body exposure: Radionuclide Factor at specified age (rem/pCi/day) O-1yr Cesiun-137 Strontium-90 Transuranics 5 yr 10 yr 0-10 ye