- 19 -
.
ne
ratatacas
for that region are sbout 30 me/mi®. (we have no data from the great
lend mass encompassed by the USSR and Satellite States and Comseunist
Cains).
Another method of sampling referred to earlier is by collestion in
stainless steel pots.
These sauples give good estinates of the present
inerenenha being added.
Finally, there is the gummed papar network
whieh though inherently less reliable, wae started in 1951 and has given
ua data for catimating both oumulative 82-90 deposition and gamma does
exposures.
These,
NS
Food sampling activities have concentrated on milk from the
Chicago and Rew York wilk shed areas as well as smepling of other food
stuffs beth here and abroad with special reference to foods which son-
stitute principle sources of caleius in the diete of various peoples.
Peak Sr-90 content of milk in these two regions has risen each year
vith @ peak far Perry, New York milk af 5.6 uye Sr-90/ga Ga in Novenber,
1956. Mere recent AEC Health and Safety Laboratory,data for Perry, New
York dried milk in tems of yye Sx-90/ga Ca follow:
December 1956 - 3.16
April 1957
« 3,12
Jamary 1957
May 1957
- 3.91
February 1957 - 1.02
June 1957)
- 59
Mareh 1957
July 1957
= he 7h
~ 3.83
- 3,00
August 1957 ~ l.25
The highest values recorded in the United States have been from Handan,
North Dakota, where in 1956 the average of the monthly samples was about
10 yue Sr-90/gm Ca with a high value in May of that year of 17. “More recent HAS). data for Nandan powdered milk follow:
THAhe