3 Pee Jatted curve in figure | sows that the fit ‘is good for all azes. While this expression y | Lett te nahneam 8 f ¥ &,. xianim FRC Report No. 7 (19) that relates “» 2.@ix 2@ Winole Dody and bone marrow in rads to CODY WHIOHT uitegrem) time. of cesium-137 for individuals, it does grqviae -« close approximation to averages of - atai eren values of cesium-187 retention for »ons Of subjects. qaweson (1) may be combined with the =¢-:ake of cesium-137 to form a generalized expression that includes the age of various — groups within an exposed population: i pokeWwW X0.08 X 1.44 [12.8 (x!+e-%)} D= UI = tp-4—1-— AG 1 PMRSMES Ure MET Me me pre. ue ar dees eet proviae for estimating effective half- 0.55 1, (x!-+e-%) Je te I WwW (2) ers Figure 3. Body weight versus age (average fer male and female) Model application—dose estimates J) = total dose (rads) I, = total intake of '7Cg (microcuries) Weboly weight (kilograms) x=age of exposed group (years) Tn. equation applies where it can be ts:-zmed that body welght, W, does not change a.cnificantly 4aring exposure. if we intake of concern is through the dietary pathway of pasture-cow-milk-man, the total intake of cesium-137 for an acute con- ta inating event can be expressed in terms of th: maximum daily intake. (See “Estimates of the Concentration of Strontium-89, Strontium— - 9, and Cesium-137 in Milk as a Function of Trim”, Report of Special Ad Hoc Committee of Federal Radiation Council, Radiological Health Data, July 1965. Figure 3 gives the average male and femaic body weights in kilograms from birth to 80 years. The average values of body weight for various ages are generally not the same for male and female; however, the differences in weight are not large. For theae body weight. and using the generalized expression for dose, figure 4 presents the total whole body and bon: marrow dose as a function of age for a total intake of 1.0 microcurie of cesium-137. Tn doses in figure 4 would also be obtained using equation (4) and a maximum daily cesium-137 intake in milk of '/s. microcurie or 31 nanocuries from an acute deposition of cesium-187. ane any where: I,,= maximum daily intake of "C, ° For the case of a single acute deposition of . vesium-187 on pasturage, the total dose may be estimated from: . D 17.6 In 7(x!-+e7*) @& For those less than about 10 years of age, most of this dose will have been received within 1 Monee sememrnete eum La eat 1 year. . tht pet ome Figure 4. Total whole body and bone marrow dose from internal cesinm-137 versus age (an assumed total intake of 3 »Ci 327Cs) Radicidgical Health 0