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*—Š o°¤¼¨š¸É¤¸‡nµš¸Éœo°¥Â¨³¤µ„š¸É »—Ĝ˜n ¨³‡°¨´¤œr
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š´ÉªÃ¨„ —´ŠÂ—ŠÅªoĜ˜µ¦µŠš¸É 2
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čoo°¤¼¨‡nµ„´¤¤´œ˜£µ¡‹ÎµÁ¡µ³ÁŒ¨¸É¥Äœ®œnª¥ °Š Bq/kg °Šœ·ªÅ‡¨—r 40K 226 Ra ¨³ 232 Th š¸É—ŠÅªoĜ˜µ¦µŠš¸É 1
Ĝ„µ¦‡Î µœª–®µ‡nµ—´œ¸ ‡ªµ¤Á¸É¥ŠšµŠ¦´ Š¸Äœ¡ºÊœš¸É¦· Áª–‹´Š®ª´—Š ¨µ ‹Î µœªœ 4 —´œ¸Å—o„n °´˜¦µž¦·¤µ–¦´ Š¸
„¤¤µ—¼—„¨ºœ (gamma-absorbed dose rate : D) ‡nµ„´¤¤´œ˜£µ¡¦´Š¸ ¤¤¼¨ °ŠÁ¦Á—¸ ¥¤ (radium equivalent activity :
Raeq) ‡nµ—´œ¸ ª´—‡ªµ¤Á¸É¥Š¦´Š¸š¸É ŗo¦´‹µ„£µ¥œ°„¦nµŠ„µ¥ (external hazard index : Hex) ¨³‡n µž¦·¤µ–¦´Š¸¥´ŠŸ¨š¸É
ŗo ¦´‹µ„£µ¥œ°„¦nµŠ„µ¥ž¦³‹Îµže (annual external effective dose rate) ¨³Å—o—ŠŸ¨š¸ÉŗoŪoĜ˜µ¦µŠš¸É 3
™µœš¸É
‡nµ„´¤¤´œ˜£µ¡¦´Š¸ ‹ÎµÁ¡µ³ÁŒ¨¸É¥ °Š
˜´ª°¥nµŠ—· œ
(Bq/kg) D
(nGy/h)
Ra eq
(Bq/kg) Hex
Annual
External
Effective
Dose Rate
(mSv/y) Ra-226 Th-226 K-40
1. °ÎµÁ£°Á¤º°Š (17) 124.04 54.80 7858.53 416.67 807.51 2.18 0.51
2. °ÎµÁ£°®µ—Ä®n (32) 120.38 47.26 3711.53 238.60 473.75 1.28 0.29
¦µ¥„µ¦
‡nµ„´¤¤´ œ˜£µ¡‹ÎµÁ¡µ³ÁŒ¨¸É¥ (Bq/kg)
K – 40 Ra – 226 Th – 232 Cs-137
‡nµÁŒ¨¸É¥š» „°ÎµÁ£°Äœ‹´Š®ª´—Š ¨µ 3149.26 ± 214.09 99.48 ± 6.64 54.19 ± 5.06 1.57 ± 0.83
‡nµÁŒ¨¸É¥ °ŠœŠ. ž. (£µ‡Ä˜o ) 511.04 ± 7.04 171.55 ± 3.13 211.19 ± 1.98 1.13 ± 0.49
‡nµÁŒ¨¸É¥ °ŠœŠ.ž. (ž¦³Áš«Åš¥) 400 48 40 -
‡nµÁŒ¨¸É¥ °Š„µ¦ª·‹´¥š´ÉªÃ¨„ 400 35 30 -
˜µ¦µŠš¸É 2 —Š„µ¦Áž¦¸¥Áš¸ ¥‡nµÁŒ¨¸É ¥ °Š‡nµ„´¤¤´œ˜£µ¡‹ÎµÁ¡µ³Äœ˜´ª°¥nµŠ—·œ °Šš» „°ÎµÁ£°Äœ‹´Š®ª´—Š ¨µ
„´ o°¤¼¨ °ŠÎµœ´ „Šµœž¦¤µ–¼Á¡ºÉ°´œ˜·š¸É¤¸°¥¼nĜž¦³Áš«Åš¥Â¨³ o°¤¼ ¨‹µ„„µ¦ª·‹´¥š´ÉªÃ¨„
˜µ¦µŠš¸É 3 —Š‡nµÁŒ¨¸É¥„´ ¤¤´œ˜£µ¡‹ÎµÁ¡µ³ °Šœ·ªÅ‡¨—r 226 Ra, 232 Th ¨³ 40K Ĝ˜´ ª°¥nµŠ—·œ‹Îµœªœ 160 ˜´ª°¥nµŠ
‹µ„ 16 °Î µÁ£° °Š‹´Š®ª´ —Š ¨µ ‡nµÁŒ¨¸É¥¦ª¤ °Š‡n µ„´¤¤´œ˜£µ¡‹Î µÁ¡µ³š¸Éčo Ĝ„µ¦Áž¦¸¥Áš¸ ¥„´  o°¤¼¨ °Š
UNSCEAR (1988, 1993, 2000) ‡nµž¦·¤µ–¦´ Š¸Â„¤¤µ—¼—„¨ºœ(D) ‡nµ„´¤¤´œ˜£µ¡¦´ Š¸ ¤¤¼¨ °ŠÁ¦Á—¸¥¤ (Raeq ) ‡nµ
—´œ¸ª´—‡ªµ¤Á¸É¥Š¦´Š¸š¸Éŗo ¦´‹µ„£µ¥œ°„¦nµŠ„µ¥ (Hex) ¨³‡nµž¦·¤µ–¦´Š¸¥´ŠŸ¨š¸Éŗo¦´‹µ„£µ¥œ°„¦nµŠ„µ¥ž¦³‹Îµže