-7agencies, but thus far I have discovered only two references (6,8) giving
some of these results.
Further data are needed - especially for the ydars
1951, 1952, 1953 and 1955.
To allow for different times of arrival, I have adjusted air concen-
trations to a common reference time of 1 day after detonation assuming a
(time) 71+ variation in activity.
Unfortunately, reference (6) does not
give the time from burst to assay for the Easy (7 May 52) and Fox (25 May
52) shots.
Results are listed in Table 2.
Times of explosion and kiloton
yields are from The Effects of Nuclear Weapons 1962 ©) ,
In some cases a number of air samples were taken serially during a 24
hour period.
In such instances each adjusted air concentration was multi-
plied by the fraction of a day it was sampled.
Then these results were
added to obtain the weighted average concentration for the entire 24 hour
period.
If one assumes a proportionality between beta activity in the air and
pst reaching man through the food chain it is possible to crudely estimate
thyroid exposures for those years for which air data are available.
Results
are shown in Table 3.
Table 3
YEAR
OF
TESTS
1951
1952
1953*
1955
1957
1958
1962
*St. George
THYROID DOSE ESTIMATES FROM AIR BETA CONCENTRATIONS
SUM OF 24 HR. PEAK
ESTIMATED AV.
ADJ. AIR CONC.
INFANT THYROID
(pe/m)
DOSE
(RAD
?
?
21,000**
5.9
?
?
?
?
30,450
8.6
4,872
1.4
3,522
1.0%%%
240,000
68
**Time after burst, not given ©) | has been assumed by me (perhaps incorrectly) to be l day.
***Calculated from measured I 131
in milk.