834
HAWLEY AND MARKEE
7000
PC/G
y=3léx-316
°
0
0
2
o
|
4
l
6
8
10
|
12
|
14
|
16
SCINTILLATOR READINGS, NET MR/ HR, 107°
l
18
20
Fig. 11—Portable-scintillator readings vs. grass activity levels
Human-thyroid-uptake Data
In the first test one cow was selected to furnish milk for humanvolunteer consumption. The data from the counting of the human thyroid
after ingestion of the milk showed the uptake fraction to be 0.19. In the
second test inhalation-thyroid-dose measurements were made on three
people who were on the test grid during the time of cloud passage. The
infinity thyroid-dose measurements were 14, 7, and 6mrads, averaging
9 mrads. Based on the thyroid uptake factor of 0.19 observed in the
first test, the dose to be expected from ingestion of 1 liter of milk per
day from the second test is roughly a factor of 100 greater than the
inhalation dose.
FUTURE RELEASES
Later in 1964 a release over dead dry grass is planned. In the
Spring of 1965, a release is plannedin which the behavior of radioiodine
under inversion conditions will be investigated. During the summer of
1965, at least two more releases will be made involving different
chemical forms of radioiodine.