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×¥š¸É‡nµ¼Š»— °Š Raeq ˜o°Š¤¸‡nµÅ¤nÁ„·œ 370 Bq/kg
œ°„‹µ„œ¸Ê ¥´ ŠÅ—o¤¸„µ¦„ε®œ—‡nµ—´ œ¸ª´—‡ªµ¤Á¸É ¥Š¦´Š¸š¸É ŗo¦´‹µ„£µ¥œ°„¦nµŠ„µ¥ (external hazard
index: Hex) Á¡ºÉ °ÄoĜ„µ¦ž¦³Á¤·œ„µ¦Å—o¦´¦´Š¸°Š‹µ„£µ¥œ°„¦nµŠ„µ¥œ·ªÅ‡¨—r„´¤¤´œ˜¦´Š¸›¦¦¤µ˜· —´ŠÂ—ŠÄœ
¤„µ¦˜n°Åžœ¸Ê (Veiga et al., 2006)
1 İ
4810
C +
259
C +
370
C =
H K Th Ra
ex ………………………….(4)
宦´‡nµ Hex š¸É¤¸‡nµž¨°—£´¥‹³˜o °Š¤¸‡nµÅ¤nÁ„·œ 1
‹³Á®ÈœÅ—oªnµ Á¤ºÉ°š¦µ‡nµ„´¤¤´œ˜£µ¡‹ÎµÁ¡µ³ °Šœ·ªÅ‡¨—r„´¤¤´œ˜¦´Š¸Äœ›¦¦¤µ˜· Ánœ 226Ra 232Th ¨³
40K Ĝ®œnª¥ °Š Bq/kg Ĝ˜´ª°¥nµŠ—·œš¸ÉÁ„ȝ‹µ„ 16 °ÎµÁ£°Äœ‹´ Š®ª´—Š ¨µ ‹³µ¤µ¦™®µ‡Î µœª–®µ‡nµ D, Raeq, Hex
¨³‡nµ annual external effective dose rate °Š¡ºÊœš¸É¦· Áª–—´Š„¨nµªœ´ÊœÇŗo ®¨´ Š‹µ„œ´Êœ„ȚΠµ„µ¦¦ª¦ª¤Â¨³
¦»žŸ¨‹µ„ o°¤¼¨š¸Éŗo ¡¦o°¤š´ÊŠÁž¦¸ ¥Áš¸¥ o°¤¼¨š¸Éŗo ‹µ„„µ¦š—¨°Š„´ o°¤¼¨š¸É¤¸°¥¼n°ŠÎ µœ´„Šµœž¦¤µ–¼Á¡ºÉ°
´œ˜·Â¨³ o°¤¼ ¨š¸É¤¸°¥¼nš´ÉªÃ¨„
Ÿ¨„µ¦ª·‹´¥Â¨³°£·ž¦µ¥Ÿ¨
‹µ„Ÿ¨„µ¦˜¦ª‹ª´—¨³ª· Á‡¦µ³®r‡nµ„´¤¤´œ˜£µ¡‹Î µÁ¡µ³ °Šœ·ªÅ‡¨—r¦´Š¸›¦¦¤µ˜·Á¦·É ¤˜oœ Á¦Á—¸¥¤-226
š°Á¦¸¥¤-232 ¨³ÃžÂ˜ÁŽ¸¥¤-40 Ĝ˜´ª°¥n µŠ—·œ‹Îµœªœ 160 ˜´ª°¥nµŠš¸ÉÁ„ȝ‹µ„š» „˜Îµ¨Äœ 10 °Î µÁ£° °Š‹´Š®ª´—
Š ¨µÅ—o—ŠÅªoĜ˜µ¦µŠš¸É 1
o°¤¼ ¨
(‹Î µœªœ˜´ª°¥nµŠ)
‡nµ¡· ´¥Â¨³‡nµ„´¤¤´œ˜£µ¡‹Î µÁ¡µ³ÁŒ¨¸É¥ (Bq/kg)
K-40 Ra-226 Th-232 Cs-137
1. °ÎµÁ£°Á¤º°Š (17)
965.40 - 17523.33 7.16 – 442.10 14.84 – 119.19 0.00 – 28.84
*7858.53 ± 326.50 124.04 ± 7.38 54.80 ± 5.35 1.70 ± 2.86
2. °ÎµÁ£°®µ—Ä®n (32)
695.88 – 12627.38 36.27 - 997.27 23.52 – 138.56 0.00 – 23.94
3711.53 ± 228.25 120.38 ± 7.00 47.26 ± 5.10 2.46 ± 1.23
3. °ÎµÁ£°¦³Ãœ— (12) 1023.31 – 4557.81 32.36 – 202.21 21.34 – 52.05 0.00 – 0.00
1973.76 ± 180.80 60.84 ± 5.73 35.58 ± 4.46 0.00 ± 0.00
4. °ÎµÁ£°„¦³Â·œ›»r (4)
340.95 – 1739.38 15.83 – 160.31 15.10 – 56.73 0.00 – 3.60
*964.51± 128.76 66.19 ± 5.25 30.52 ± 3.66 0.90 ± 0.78
5. °ÎµÁ£°š·Š¡¦³ (12) 1088.93 – 3739.64 27.79 – 135.31 18.03 – 113.05 0.00 – 7.99
2045.27 ± 180.83 66.90 ± 5.87 50.09 ± 4.76 0.67 ± 0.55
˜µ¦µŠš¸É 1 —Š‡nµ¡· ´¥Â¨³‡n µÁŒ¨¸É¥ °Š‡nµ„´¤¤´œ˜£µ¡‹ÎµÁ¡µ³ °Šœ· ªÅ‡¨—r 40K 226Ra 232 Th ¨³ 137Cs Ĝ
˜´ª°¥nµŠ—·œ 160 ˜´ª°¥n µŠ °Šš»„°ÎµÁ£°Äœ‹´Š®ª´—Š ¨µ