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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 13, Number 2
JKCSEZ 13(2)
April 20, 1969 

Fallout Radioactivity in Korean Foodstutts (Part 4) Stronitium-90 in Liquid Whole Milk Produced in Korea

한국식품 중의 방사능 함량 (제4보) 한국 우유의 스트론튬-90 함량
Kyung Rin Yang

The concentration of Strontium-90 in liquid whole milk produced in Korea were measured during past four years. The samples of milk were purchased from dairies in Seoul. Strontium-90 was analysed radiochemically and the amount of stable calcium was also determined. Radioactivity of Yttrium-90 was counted in low background beta counter which has the background of 1.38 cpm. The concentrations of Strontium-90 in the milk are 25.1 PCi 90Sr/g.Ca in 1965, 26.8 PCi 90Sr/g. Ca in 1966, 13.7 PCi 90Sr/g.Ca in 1967 and 18.2 PCi 90Sr/g.Ca in 1968 in annual average. The concentrations of Strontium-90 in the milk of 1967 and of 1968 were decreased approximately compared with the values of 60% 1965 and 1966. From the results we can see that Strontium-90 concentrations in the milk vary roughly proportionally with the specific activity of fallout. Considering on the safety problems, the Strontium-90 levels in the milk produced in Korea were far below the maximum permissible level recommended by ICRP.
181 - 186
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