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Dr, John C. Bugher, W.De, Director’a - oS Wleooi, May 13, 195k os i
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Division of Biology and Kedicine”.
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2 gordon’. Dunning, Health Phigeleist'”
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Oe Biophysics Branch,| Division of Bloloiy
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DADTATION1OSE,70.STHEROID OF NATIVES FROMHORTA.
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ACLASSIFIG,@,0N GANCELLED
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the gut after ingestion of fallout material. ‘The telluriuna, in
turn, might disintegrate inte radioactive iodine while in the city To
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o}. there aro ‘sone “47 radioactive isotopes of telluriun but only” 7 of
“sagas
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these are produced in fission,
Of these, 6 are not of interest. .
3?( have too short a half-life, 1 leads to stable, iodine-127 and i
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S| leads to fodine-129 with a half-life of 2- x 10? years), The
.
2.2.
AE renaining radioisotope i's telluriun-132, with a half-life “of 7 hoirs
leading to Lodine-132 with a half-life of 2.4 hours. (Incidentally
ig3) there is no tellium precursor that is of interestheres)
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he Giithouthaving the original data of LASL I have accepted their.FE
vii
g estimat that there were ingested and/or inhaled the’ products «of: :
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mS 5 x 101 fissions, assuaed they were all ingested, and then‘proceeded -
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fact that telluriun, asa precursor to iodine, may be present in
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This memorandum ds “tn reply ‘to your request foran“estinateof
additional doses to the thyroid of the Rongelap natives due to the
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with subsequent deposition of the fodine in the thyroid.-oe
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COMMISSION
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US DOU, ARCHIVE:
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‘to calculate the dose to the thyroid from (a) i3t (b) each’ short~
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lived iodine isotope of interest and (c), the added dose coming from*-ae
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The calculationsshowthatT132~{132 F421 produce Ee
added dosage of about 26. WRESTDAA mee ce2
as
a oe = toe
The best estirated percentage absorption and depositsonof ‘Lodine istes
yet to be determined, The best estimate I can turn up to date is | tean
still the 20% quoted in HBS Handbook 52, Kowever, I will contime to”
search for additional information,
In the meantine the table below.’
indicates the magnitude of doses to the thyroid if one assuxes 20,
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50, and 100% absorption and deposition. Incidentally, it may be pay
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noted that the calculations below tased on 20% (the,nusber assuned |
‘by LASL) show estirated doses to the thyroid from LI131 and from =~
- shorter lived Lodine isotopes to be in
Bits agreezent withthose -
estirated by LASL, i.e, 50 repsfor 1}
and 80 reps. for short”
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