-. OFFICIAL USE ORLY bu: We Number of Age Groux Individuals <5 5 - 16 | - > 16 Urine(ml) Volume 1155 Li . UCRL-12275 % of Total “Volume of 7 \ 42.8 4829, 31 20.1 1603. 75-0 The urine semples are typical of adults and the calculated thyroid burdens are presumably also those of adults. hdd . Associated with this pit are the shorter lived isotopes I 136 rt? and If the fodine entered by way of inhalation, the time of intake was H+6 On the other hand, if water (and food) were the principal source, to H + 18. the time of ingestion would be extended from H + 6 to H + 51. Three items contribute to the differences in dose from the various jodine isotopes. These are! (1) radioactive decay before inhalation or oral ingestion, (2) differences in the fission ylelds of the chains, ‘© and (3) the “average energy deposited in the thyroid per disintegration. presented in Table I for yr and yt, ‘distribution in the cloud was assumed. that, on the average, These factors are In the case of inhalation, uniform For oral ingestion it was assumed: 1/3 of the intake occurred at H + 10 and 2/3 at H + 30. \ Table I Ratio of Doses for the Two Modes of Intake Tnhalation I 1.33 | /131 I 135 Oral Ingestion Z 23 /1DL I 135 /5333 /13). Decay 0.68 0.41 0.487 0.148 Fission yiera’®) 1.38 1.25 1.38 1.2% Energy 2.00 1.50 2.00 1.50 1.85 0.57 Net Factor 9009334 | “OFFICIAL EESE OMEY | 1.35 | 0.27