full2010.pdf - page 1475

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Natural Radioactivity Assessment in Nakhon Si Thammarat Province
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Thumwadee Thongna1 Supphawut Benjakul2 and Prasong Kessaratikoon 3*
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(40K 226Ra ¨³ 232 Th) ¨³š¸É¤œ» ¬¥r ¦oµŠ ¹Êœ (137Cs) Ĝ˜´ª°¥n µŠ—·œ‹Îµœªœ 180 ˜´ª°¥n µŠš¸ÉÁ„ȝ‹µ„¦·Áª– 23 °Î µÁ£°
°Š‹´Š®ª´ —œ‡¦«¦¸›¦¦¤¦µ ž¦³Áš«Åš¥ ץčo®´ ªª´—¦´Š¸ÂÁ‹°¦r ¤µÁœ¸¥¤¦· » š›·Í¨³¦³„µ¦ª·Á‡¦µ³®r
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¤®µª·š¥µ¨´¥š´ „¬·– čoÁª¨µÄœ„µ¦˜¦ª‹ª´ —˜´ª°¥nµŠ¨³ 10,800 ª·œµš¸ Ÿ¨„µ¦ª·‹´¥ ¡ªnµ ‡nµ„´¤¤´œ˜£µ¡¦´Š¸‹Î µÁ¡µ³
°Š 40K 226Ra 232Th ¨³ 137 Cs Ĝ˜´ª°¥n µŠ—·œ ¤¸‡nµ¡· ´¥°¥¼nĜn ªŠ 409.40 - 12600.42 Bq/kg 宦´  40 K 10.07 -
364.43 Bq/kg 宦´  226Ra 10.65 - 267.93 Bq/kg 宦´ 232Th ¨³ 0.00 - 7.30 Bq/kg 宦´ 137 Cs ¨³¤¸
‡nµÁŒ¨¸É¥Áž}œ 4313.18 ± 148.16 Bq/kg 108.55 ± 31.19 Bq/kg 73.95 ± 4.15 Bq/kg ¨³ 0.38 ± 0.20 Bq/kg ˜µ¤¨Îµ—´
œ°„‹µ„œ¸Ê¥´ŠÅ—ošÎ µ„µ¦‡Îµœª–‡n µž¦·¤µ–¦´ Š¸ —¼—„¨ºœÄœ°µ„µ« (D) Î µ®¦´£µ¥œ°„°µ‡µ¦o µœÁ¦º°œ ‡n µ
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›¦¦¤µ˜· (40K 226Ra ¨³ 232Th) š¸É˜¦ª‹ª´—Å—oĜ¦·Áª–‹´Š®ª´—œ‡¦«¦¸›¦¦¤¦µ ¡ªnµž¦·¤µ–¦´Š¸—¼—„¨ºœÄœ°µ„µ«
¤¸‡nµÁŒ¨¸É ¥ 277.09 nGy/h Ž¹ÉŠÁž}œ‡n µš¸É¤µ„„ªn µ‡nµÁŒ¨¸É¥ž¦· ¤µ–¦´Š¸—¼—„¨ºœÄœ°µ„µ« °Šž¦³Áš«Åš¥ (>77 nGy/h)
nªœ‡nµ„´¤¤´œ˜£µ¡¦´Š¸ ¤¤¼¨Á¦Á—¸¥¤š¸É‡Îµœª–Å—o¤¸‡nµÁŒ¨¸É¥Áž}œ 552.88 Bq/kg Ž¹ÉŠ¤¸ ‡nµš¸É ¼Š„ªnµÁ„–”r¤µ˜¦“µœ‡ªµ¤
ž¨°—£´ ¥š¸É„ε®œ—Ūo (>370 Bq/kg) nªœ‡nµ—´œ¸ª´—‡ªµ¤Á¸É¥Š¦´ Š¸š¸Éŗo¦´‹µ„£µ¥œ°„¦nµŠ„µ¥ ¡ªnµ¤¸‡nµÁŒ¨¸É ¥
Ášnµ„´ 1.49 Ž¹ÉŠ¤¸‡nµ¼Š„ªnµÁ„–”rž¨°—£´¥ (>1) Ánœ„´œ ¨³‡nµž¦·¤µ–¦´Š¸¥´ŠŸ¨š¸Éŗo ¦´‹µ„£µ¥œ°„¦nµŠ„µ¥ž¦³‹Îµže
¡ªnµ¤¸‡nµÁŒ¨¸É¥Ášn µ„´ 0.34 mSv/y Ž¹ÉŠ¤¸‡nµœo°¥„ªnµ‡nµÁŒ¨¸É¥ °Š UNSCEAR (< 0.48 mSv/y)
‡ÎµÎµ‡´: „´¤¤´œ˜£µ¡‹ÎµÁ¡µ³ ®´ ªª´—¦´ Š¸ÂÁ‹°¦r¤µÁœ¸¥¤¦· »š›·Í ¦³„µ¦ª·Á‡¦µ³®rÂ„¤¤µÁž„ئÁ¤˜¦¸
‡nµž¦·¤µ–¦´Š¸—¼—„¨ºœÄœ°µ„µ« ‡nµ„´¤¤´œ˜£µ¡¦´Š¸ ¤¤¼¨Á¦Á—¸¥¤ ‡nµ—´œ¸ª´—‡ªµ¤Á¸É¥Š¦´Š¸š¸Éŗo¦´‹µ„
£µ¥œ°„¦nµŠ„µ¥ ‡nµž¦·¤µ–¦´Š¸¥´ŠŸ¨š¸Éŗo¦´‹µ„£µ¥œ°„¦nµŠ„µ¥ž¦³‹Îµže
1 œ· ·˜ž¦·µÃš ®¨´„¼˜¦ ªš.¤.(¢d ·„r) µ µª·µ¢d ·„r ‡–³ª·š¥µ«µ˜¦r ¤®µª· š¥µ¨´¥š´„¬·– Š ¨µ 90000
Master’s Degree Student, Department of Physics, Faculty of Science, Thaksin University, Songkhla, 90000, Thailand.
2 Ÿ¼onª¥ª·‹´¥ µ µª· µ¢d ·„r ‡–³ª·š¥µ«µ˜¦r ¤®µª·š¥µ¨´¥š´„¬·– Š ¨µ 90000
3 °µ‹µ¦¥rž¦³‹Îµ µ µª·µ¢d ·„r ‡–³ª·š¥µ«µ˜¦r ¤®µª· š¥µ¨´¥š´„¬·– Š ¨µ 90000
Corresponding author : Ú¦«´¡šr : 081-5423598 E-mail:prasong@tsu.ac.th