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Gordon M, Dunning, secaikBeicist2! reSERBORoo.
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This memorandun is “in reply 55 your eee foran estimate of.
additional doses to the thyroid of the Fongelap natives due to the
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fact that tellurium, as‘a precursor to lodine, may be present in _*
the gut after ingestion of fallout material. The telluriua, in
er
turn, might disintegrate into radioactive iodine while in the gut, *
pwith subsequent. ae of the iodine in the thyroid.-= Bel Coe
x 6 TT
,
.
Ae Seu. There: are ‘some Wn radioactive ‘isotopes of telluriun but only. 7 of _
ae Ast “| these are produced in fission. Of these, 6 are not of interest...
ota,
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wees there is no tellium precursor that is of interest heres)
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a “i; S withouthaving the original data of LASE I have accepted their:weit ig ge
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estimate that there were ingested and/or inhaled the products of ers
=
5 x i108 fissions, assumed they were all ingestedi and thenproceeded:
. he33
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to calculate the dose to the thyroid from (a) 1131
(b) each short-
— . lived jogine isotope of interest and (c), the added dose coming from*.=
~, .., ,TH32_7132, ‘the calculations showthat T132.r132 will produce an}: pleco
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. The ‘best estirated percentage absorption and depositonof ‘todine 1a2:
yet to be determined, The best estirate I can turn upto cate is ee
-
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still the 20% quoted in NBS Handbook 52, However, I will contimeto™<
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° search for additional information, In the meantine the table below.SF
indicates the magnitude of doses to the thyroid if one assumes 20, **2 20°" ~
50, and 100% absorption and deposition. Incidentally, it may be |=es *,
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shorter lived iodine isotopes to be in
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noted that the calculations below tased on 20% (the nusber assumed _|-_. <.-
‘by LASL) show estinated doses to the thyroid fron i131
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00 ye renaining radioisotope is telluriun-132, with a half-life‘of 77 hots
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3 } leading to itodine-132 with a half-life of 2.) hours. Coeones eh
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59(have tooshort a half-life,:1 leads to stable iodine-127 and Vv
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