SLIDE 20
Radioactivity in excreta.
Urine samples for 24-hour elimination were pooled
and collected on the 17th day post detonation from persons evacuated from
Rongelap Island (Co72). The urine was sent to Harris at Los Alamos Scientific
Laboratory and an estimate of thyroid absorbed dose from internal emitters was
reported by Cronkite (Cr56). The 64-person composite urine sample was 75%
adult urine (18 { , >16 years of age), 20% adolescent and child urine (4.84 ,
5-16 years of age) and 4.8% child and infant urine (1.2% , <5 years of age)
(264). Harris indicated a mean activity of 0.48 kBq (1.31 x 10°“Ci) of
I in the Rongelap adult 24-hour urine taken op ghe 17th day post detonation
(Co72). The adult mean peak thyroid content of
I was estimated by Harris
to be 414 kBq (11.2 pCi) based on these urine samples (Ha54). This estimate
was calculated on the assumption that 0.1% of stable iodine burden on the
first day would be eliminated via the urine between the 15th and 17th days
(Co72).
Cronkite (Cr56) reported 895, and 1403, urine activity excretion on day
45 post detonation for.gix adults from Rongelap_ sland.
eghivity excreted for ““§r was 8.9 Bq (2.4 x 10
Ba, 2.2 Bq (6.0 x 10 fet) on day 45.
The mean urine
fet) on day 45 and for
RADIOACTIVITY IN EXCRETA
(RONGELAP)
Nuclide
“ol
one
Ba
Day Post
Detonation
Urine Was Collected
17
Adult Mean
Activity Excreted
In One Day
Bq
480
45
8.9
45
2.2
25