Strontium-90 Levels in Milk
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Park Chan-Kirl, Yang Kyung-Rin,
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( Park Chan-Kirl )
Atomic Energy Research Institute Health Physics Division
( Yang Kyung-Rin )
Atomic Energy Research Institute Health Physics Division
KMID : 0371819710030010009
Abstract
¹æ»ç¼º ³«Áø¿¡ ÀÇÇÑ ¿ì¸®³ª¶ó ½ÄǰÀÇ ¿À¿°µµ¸¦ ÆÄ¾ÇÇÒ ¸ñÀûÀ¸·Î ¿ì¸®³ª¶óÀÇ ¿ìÀ¯ÁßÀÇ ½ºÆ®·ÐƬ-90ÀÇ ¾çÀ» ÃøÁ¤ÇÏ¿´´Ù.
½ºÆ®·ÐƬÀÇ ºÐ¼®Àº ¹ß¿¬Áú»ê¹ý¿¡ ÀÇÇÏ¿´À¸¸ç, ½ºÆ®·ÐƬ ´ÜÀ§·Î °á°ú¸¦ Á¤¸®Çϱâ À§ÇÏ¿© Ä®½·ÀÇ ÇÔ·®µµ µ¿½Ã¿¡ Á¤·®ÇÏ¿´´Ù.
¹æ»ç´ÉÀÇ ÃøÁ¤Àº ^(90)Sr+^(90)YÀÇ ¹æ»çÆòÇüÀÌ ÀÌ·ç¾îÁø ÈÄ¿¡ ^(90)YÀÇ ¹æ»ç´ÉÀ» ÃøÁ¤ÇÏ¿´´Ù. ¾×ü ¿ìÀ¯ÀÇ ½ºÆ®·ÐƬ-90ÀÇ ÇÔ·®ÀÌ °¡Àå ¸¹¾Ò´ø °ÍÀº 1966³âÀÇ 34.9 pCi^(90)Sr/g¤ýCaÀ̾úÀ¸¸ç, 1966³âÀ» °íºñ·Î ÇöÀúÇÑ °¨¼Ò¸¦ º¸¿©ÁÖ°í ÀÖ´Ù.
ºÐÀ¯ÀÇ ½ºÆ®·ÐƬ-90ÀÇ ÇÔ·®Àº ¾×ü ¿ìÀ¯¿Í °°Àº °ªÀ» º¸¿© ÁÖ°í ÀÖÀ¸¸ç, ¹æ»ç¼± ÀåÇØ¸é¿¡¼ °í·ÁÇÒ¶§ ¾ÈÀüÇÑ ÇÔ·®ÀÓÀ» ¾Ë ¼ö ÀÖ´Ù.
The levels of strontium-90 in milk produced in Korea were determined during the past six years. Milk samples were collected from dairies and market shops in seoul area.
Strontium-90 in milk was separated from calcium using fuming nitric acid and purified radiochemically. After seculear equilibrium was completed, the radioactivity of yttrium-90 was counted in a low background beta counting system. The determination of stable calcium in milk was also made by volu¡©metric method using 0. 1 N potassium permanganate solution.
The highest value of 34. 9 pCi 90Sr/g-Ca was determined in August, 1966 and the lowest value was 7. 5 pCi 90Sr/g-Ca in August, 1967. From the result we can say that levels of strontium-90 are decreasing year after year and are far bellow the maximum permissible level recommended by International Committe on Radiation Protection.
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