ºîÀ®¡§ 2000/03/14 ¼¾¾¡¡¹¯¹Ô
¥Ç¡¼¥¿Èֹ桡¡¡¡¡¡§160017
ICP-MS¤Ë¤è¤ë´Ä¶»îÎÁÃæ¤Î U, Th, Pu ¤ÎʬÀÏ
ÌÜŪ¡¡¡¡¡¡¡¡¡¡¡¡¡§´Ä¶Ãæ¤Ë¤ª¤±¤ë U, Th, Pu ¤ÎICP-MS¤òÍѤ¤¤¿Ê¬ÀϤò¹Ô¤¤¡¢Ç»ÅÙ¤ÈÆ°Â֤˴ؤ¹¤ë¥Ç¡¼¥¿¤òÆÀ¡¢¸¶»ÒdzÎÁ¥µ¥¤¥¯¥ë¤Ë·¸¤ï¤ë´Ä¶°ÂÁ´É¾²Á¤Ë»ñ¤¹¤ë¡£
¸¦µæ¼Â»Üµ¡´Ø̾¡¡¡§Êü¼ÍÀþ°å³ØÁí¹ç¸¦µæ½ê¡¡Âè4¸¦µæ¥°¥ë¡¼¥×
±þÍÑʬÌî¡¡¡¡¡¡¡¡¡§´Ä¶²Ê³Ø¡¢Êü¼ÍÀ¸Âֳء¢Ãϵ岽³Ø¡¢Ê¬Àϲ½³Ø¡¢ÊÝ·òʪÍý³Ø
³µÍס¡¡¡¡¡¡¡¡¡¡¡¡§
¡¡U, Th, Pu Åù¥¢¥ë¥Õ¥¡¡¼³Ë¼ï¤ÎʬÀϤˤϽ¾Í襢¥ë¥Õ¥¡¡¼¥¹¥Ú¥¯¥È¥í¥á¥È¥ê¡¼Ë¡¤¬ÍѤ¤¤é¤ì¤Æ¤¤¿¤¬Ê¬ÀÏÁàºî¤È¬Äê¤Ë»þ´Ö¤È¼ê´Ö¤¬¤«¤«¤ë¡£¤½¤³¤Ç¡¢¶áǯµ»½ÑŪ¤ËÂ礤¯¿ÊÊ⤷¤Æ¤¤¿ICP-MS¤òÍѤ¤´Ä¶»îÎÁÃæ¤Ë´Þ¤Þ¤ì¤ë¤³¤ì¤é¤Î³Ë¼ï¤ÎÈùÎÌʬÀÏË¡¤ò¸¡Æ¤¤·¤¿¡£¤½¤Î·ë²Ì¡¢¸¡½Ð´¶ÅÙ¤ËÍ¥¤ì¤¿Ê¬ÀÏË¡¤ò³ÎΩ¤¹¤ë¤³¤È¤¬¤Ç¤¡¢ÅÚ¾í»îÎÁ¤òÃæ¿´¤ËʬÀϥǡ¼¥¿¤òÆÀ¤¿¡£
¡¡
¾ÜºÙÀâÌÀ¡¡¡¡¡¡¡¡¡§
1. ¤Ï¤¸¤á¤Ë
¡¡´Ä¶Ãæ¤Ë¤ª¤±¤ë U, Th, Pu ¤ÎÇ»ÅÙ¤ÈÆ°ÂÖ¤òÄ´¤Ù¤ë¤³¤È¤Ï¸¶»ÒdzÎÁ¥µ¥¤¥¯¥ë¤Ë·¸¤ï¤ë´Ä¶°ÂÁ´É¾²Á¾åÂçÊѽÅÍפȹͤ¨¤é¤ì¤ë¡£½¾Íè¡¢¤³¤ì¤é¥¢¥ë¥Õ¥¡¡¼³Ë¼ï¤ÎʬÀϤˤϼç¤È¤·¤Æ¥¢¥ë¥Õ¥¡¡¼¥¹¥Ú¥¯¥È¥í¥á¥È¥ê¡¼Ë¡¤¬ÍѤ¤¤é¤ì¤Æ¤¤¿¡£¤·¤«¤·¡¢Ê¬ÀÏÁàºî¤È¬Äê¤Ë»þ´Ö¤È¼ê´Ö¤¬¤«¤«¤ë¡£¤Þ¤¿¡¢Pu¤Ë¤Ä¤¤¤Æ¤Ï¡¢¤³¤ÎÊýË¡¤Ç¤Ï239Pu¤È240Pu¤Ï¥¨¥Í¥ë¥®¡¼¤¬¶á¤¤¤¿¤áʬΥ¬Äê¤ÏÆñ¤·¤¤¡£¤½¤³¤Ç¡¢ICP-MS(ͶƳ·ë¹ç¥×¥é¥º¥Þ¼ÁÎÌʬÀÏË¡)¤òÍѤ¤¤¿Ê¬ÀÏË¡¤ò¸¡Æ¤¤·¡¢´Ä¶»îÎÁ¤Ë´Ø¤¹¤ëʬÀϥǡ¼¥¿¤ò½Ð¤·¤¿¡£
¡¡
2. ʬÀÏË¡
¡¡UµÚ¤ÓTh¤Ë¤Ä¤¤¤Æ¤Ï¡¢Ê´ºÕ¤·¤¿»îÎÁ(Ìó100mg)¤ò¥Æ¥Õ¥í¥óÍÆ´ï¤ËÆþ¤ì¡¢¾Ë»À¡¢¤Õ¤Ã²½¿åÁÇ»À¡¢²á±öÁÇ»À¤ò²Ã¤¨¡¢¥Þ¥¤¥¯¥í¥¦¥§¡¼¥Ö¥ª¡¼¥Ö¥ó¤Ç²ÃǮʬ²ò¤·¤¿¡£¤½¤ì¤ò¾øȯ´¥¸Ç¤·¤¿¸å¡¢¾Ë»À¤ËÍϤ«¤·¡¢¤µ¤é¤Ë´õ¼á¤·¤¿¡£Â¬Äê»þ¤Î¥É¥ê¥Õ¥È¤Ê¤É¤òÊäÀµ¤¹¤ë¤¿¤á¤ÎÆâÉôɸ½à¤È¤·¤ÆBi(20ppb) ¤òź²Ã¤·¤¿¡£Â¬Äê¤Ë¤Ï¡¢Yokogawa PMS- 2000¤òÍѤ¤¤¿¡£
¡¡
¡¡Pu¤ÎʬΥ¤Ï°Ê²¼¤ÎÊýË¡¤Ë¤è¤ê¸¡Æ¤¤·¤¿¡£¤Þ¤º¡¢»îÎÁ¤ò500¡î¤Ç²ÃÇ®¤·¡¢Íµ¡Êª¤òʬ²ò¤·¤¿¸å¡¢¾Ë»À¤ÇÃê½Ð¤·¤¿¡£Pu¤Î²½³Ø·Á¤ò4²Á¤Ë¤½¤í¤¨¤¿¸å¡¢»îÎÁÍϱդò¥¤¥ª¥ó¸ò´¹¼ù»é(Dowex 1x8)¡¢¤Þ¤¿¤ÏÃê½Ð¥¯¥í¥Þ¥È¥°¥é¥Õ¥£¡¼(TEVA)¤ËÄ̤·Pu¤ÎʬΥǻ½Ì¤ò»î¤ß¤¿¡£¼ýΨ¥È¥ì¡¼¥µ¡¼¤ª¤è¤Ó¥¹¥¿¥ó¥À¡¼¥É¤È¤·¤Æ242Pu¤òÍѤ¤¤¿¡£»îÎÁ¤«¤é¤ÎPu¤ÎʬΥ¤ËºÝ¤·¤Æ¤Ï¡¢²½³Ø·Á¤ò4²Á¤Ë¤¹¤ëÁàºî¡¢U¤ä¾¤Î¶¦Â¸¸µÁǤνüµî¡¢²½³Ø¼ýΨÅù¤Ë¤Ä¤¤¤Æ¸¡Æ¤¤·¤¿¡£¤Þ¤¿¡¢Dowex(1x8)¤ÈTEVA¤ÎÈæ³Ó¤â¹Ô¤Ã¤¿¡£Â¬Äê¤Ë¤Ï»Í½Å¶Ë·¿ICP-MS(Yokogawa PMS- 2000)¤òÍѤ¤¤¿¡£
¡¡
3.¡¡·ë²Ì
¡¡U, Th ¤Ë¤Ä¤¤¤Æ¤Ï¡¢ÍϱÕÃæ¤ÎÃͤȤ·¤Æ 1 ppt(1 pg/ml)°Ê²¼¤Î¸¡½Ð²¼¸ÂÃͤòÆÀ¡¢¤Þ¤¿¡¢Èæ³Óɸ½àʪ¼Á¤ÎÊݾÚÃͤÈÂçÊÑÎɤ¤°ìÃפò¼¨¤·¤¿¡£ÅÚ¾í¤ÎʬÀϤˤĤ¤¤Æ¤Ï¡¢¸½ºß¤Þ¤Ç¤ËÆüËܳÆÃϤǺμ褷¤¿Ìó100»îÎÁ¤Ë¤Ä¤¤¤ÆʬÀϤ¬½ª¤ï¤Ã¤Æ¤¤¤ë¡£ÅÚ¾í¤Î¼ïÎàÊ̤ËÈæ¤Ù¤ë¤È¡¢Th¤Ï²«¿§ÅÚ¤äÀÖ¿§Åڤ˹⤤·¹¸þ¤¬¤¢¤Ã¤¿¡£²«¿§ÅÚ¤¬¹â¤¤Ãͤò¼¨¤¹¤Î¤Ï¡¢¤½¤ÎÊì´ä¤¬²ÖÖ¾´ä¤Ç¤¢¤ê Th Åù¤ò¿¤¯´Þ¤ó¤Ç¤¤¤ë¤¿¤á¤È¿äÄꤵ¤ì¤ë¡£Æ±¤¸¤¯²ÖÖ¾´äÃæ¤Ë¿¤¯´Þ¤Þ¤ì¤ëU¤Ë¤Ä¤¤¤Æ¤ÏTh¤Û¤ÉÌÀ¤é¤«¤ÊÅÚ¾í¤Î¼ïÎà¤Ë¤è¤ë°ã¤¤¤Ï¸«¤é¤ì¤Ê¤«¤Ã¤¿¡£¤³¤ì¤Ï¡¢ÇÀ¹ÌÃϤËź²Ã¤µ¤ì¤¿¥ê¥ó»ÀÈîÎÁÃæ¤ÎU¤Î±Æ¶Á¤«¤È»×¤ï¤ì¤ë¡£¿¢Êª»îÎÁ¤ä¿å»îÎÁÅù¤Ë¤Ä¤¤¤Æ¤âʬÀϥǡ¼¥¿¤òÆÀ¤¿¡£
ɽ1¡¡²æ¤¬¹ñ¤ÎÅÚ¾íÃæ¤Î¥¦¥é¥ó¤È¥È¥ê¥¦¥à¤ÎÇ»ÅÙ(ÅÚ¾í·²Ê̤˸«¤¿Ê¿¶ÑÃÍ)¡Ê¸¶ÏÀʸ3¤è¤ê°úÍÑ¡Ë
------------------------------------
¥Ê¥ì¥»ú¦¥Û¥·þÐà ¥µüÐ¥Á¥½ô U(ppm) Th(ppm)
------------------------------------
¥±€€¥ï¡¦¥Ã¥Ê¥ì 30 2.02 4.97
¥¦¡¦¥½¥¡¥Èæťޥʥì 12 2.94 8.29
¥¦øÁ¥¡¥½¥±¥Û¥â¥Ê¥ì 8 2.41 7.70
¥¿¥è¥½¥¡¥Ê¥ì 8 2.79 12.4
¥¤¥©¥½¥¡¥Ê¥ì 6 2.50 9.97
¡¦¡¼¡¦ò§¡¢¥Ê¥ì 4 2.91 7.11
¥³¥¹¥ª¥è¥Õ¡¢¥¹¥Þ¥Ê¥ì 4 0.59 2.97
¥Ê¡¦¥¦¡¦¥Ê¥ì 3 1.12 2.56
¥¦¡¦¥½¥¡¥Äìťޥʥì 2 2.31 8.92
------------------------------------
¡¡ËÜʬÀÏË¡¤Ë¤è¤ë239Pu¤Î¸¡½Ð²¼¸ÂÃͤϡ¢»îÎÁÍϱÕÃæ¤ÎÇ»Å٤Ȥ·¤Æ¡¢0.07 mBq/ml(¤Þ¤¿¤Ï0.03 pptÄøÅÙ)¤Ç¤¢¤Ã¤¿¡£¼ÂºÝ¤ÎÅÚ¾í¤Ç¤Ï¡¢»îÎÁ20g¤òÍѤ¤¤¿¾ì¹ç¡¢0.1Bq/kg(´¥Áç)ÄøÅÙ¤ÎÇ»Å٤ޤǬÄê²Äǽ¤Ç¤¢¤Ã¤¿¡£IAEA¤¬ºîÀ®¤·¤¿¼ï¡¹¤ÎÈæ³Óɸ½à»îÎÁ¤òʬÀϤ·¤¿·ë²Ì¡¢¿ä¾©ÃͤȤ·¤Æ¤¢¤²¤é¤ì¤Æ¤¤¤ë239+240Pu¤ÎÃͤÈÎɤ¤°ìÃפò¼¨¤·¤¿¡£Ê¬ÀÏÎã¤ò¤¢¤²¤ë¤È(¥«¥Ã¥³Æâ¤ÏIAEA¤Î¿ä¾©ÃÍ)¡¢ IAEA-Soil-6: 1.0 Bq/kg (1.0 Bq/kg) ; IAEA-135: 211 Bq/kg (213 Bq/kg); IAEA-367: 39.5 Bq/kg (38 Bq/kg); IAEA-368: 29.8 Bq/kg (31 Bq/kg)¤Ç¤¢¤Ã¤¿¡£240Pu¡¿239Pu¸¶»ÒÈæ¤Ï¡¢ IAEA-Soil-6: 0.19; IAEA-135: 0.21; IAEA-367: 0.31; IAEA-368: 0.04¤Ç¤¢¤ê¡¢»îÎÁ¤Î¼ïÎà¤Ë¤è¤êÌÀ¤é¤«¤Ëº¹¤¬¤¢¤Ã¤¿(240Pu¡¿239PuÈæ¤Ë´Ø¤¹¤ëIAEA¤Î¿ä¾©ÃͤϤʤ¤)¡£
¡¡
¡¡²æ¤¬¹ñ¤Î°ìÈ̴Ķ¤ÎÅÚ¾í»îÎÁ¤Ç¤Ï¡¢¤Þ¤ÀʬÀÏ¿ô¤¬¾¯¤Ê¤¤¤¬240Pu¡¿239PuÈæ¤ÏÌó0.17ÄøÅ٤Ǥ¢¤Ã¤¿¡£¡¡º£²ó¤Î¸¦µæ·ë²Ì¤«¤é¡¢´Ä¶Ãæ¤ÎPuÇ»ÅÙµÚ¤ÓƱ°ÌÂÎÈæ¤Î¬Äê¤ËICP-MSË¡¤ÏÂçÊÑ͸ú¤È¹Í¤¨¤é¤ì¡¢º£¸å¡¢´Ä¶°ÂÁ´¸¦µæ¤ä¥â¥Ë¥¿¥ê¥ó¥°¤Ø¤Î±þÍѤâ´üÂԤǤ¤ë¡£
¿Þ1¡¡¥×¥ë¥È¥Ë¥¦¥à¤ÎʬÀÏË¡¤Î³µÍסʸ¶ÏÀʸ1¤è¤ê°úÍÑ¡Ë
¡¡
¥³¥á¥ó¥È¡¡¡¡¡¡¡¡¡§
¡¡ICP-MS¤òÍѤ¤¤ë¤³¤È¤Ë¤è¤ê¡¢¸¡½Ð´¶ÅÙ¤ËÍ¥¤ì¤¿´Ä¶»îÎÁ¤ÎʬÀÏË¡¤ò³ÎΩ¤¹¤ë¤³¤È¤¬¤Ç¤¡¢ÅÚ¾í»îÎÁ¤òÃæ¿´¤ËʬÀϥǡ¼¥¿¤òÆÀ¤¿¡£
¡¡
¸¶ÏÀʸ£± Data source 1¡§
Determination of plutonium concentration and its isotopic ratio in environmental materials by ICP-MS after separation using ion-exchange and extraction chromatography
Y. Muramatsu (1), S. Uchida (1), K. Tagami (1), S. Yoshida (1), and T. Fujikawa (2)
(1) Natinal Institute of Radiological Scieneces (NIRS), (2) Kansai Environmental Engineering Center
J. of Analytical Atomic Spectrometry, 14, 859-865, (1999)
¸¶ÏÀʸ£² Data source 2¡§
Concentrations of lanthanide elements, Th, and U in 77 Japanese surface soils
S. Yoshida, Y. Muramatsu, K. Tagami, and S. Uchida
Natinal Institute of Radiological Scieneces (NIRS)
Environment International, 24, 275-286 (1998)
¸¶ÏÀʸ£³ Data source 3¡§
ICP-MS¤òÍѤ¤¤¿´Ä¶»îÎÁÃæ¤ÎPu, U, Th ¤ÎʬÀÏ
¼¾¾¹¯¹Ô, µÈÅÄ¡¡Áï
Êü¼ÍÀþ°å³ØÁí¹ç¸¦µæ½ê
RADIOISOTOPES, VOL.48, 472-487, (1999)
»²¹Í»ñÎÁ£± Reference 1¡§
¥¡¼¥ï¡¼¥É¡§¥¦¥é¥ó¡¡uranium¡¢¥È¥ê¥¦¥à¡¡thorium¡¢¥×¥ë¥È¥Ë¥¦¥à¡¡plutonium¡¢¹â¼þÇÈͶƳ¥×¥é¥º¥Þ¼ÁÎÌʬÀÏ´ï¡¢ICP-MS¡¢´Ä¶»îÎÁ¡¡environmental materials¡¢ÅÚ¾í¡¡soil¡¢Ê¬ÀÏ¡¡analysis¡¢Ê¬Î¥¡¡separation¡¢Èæ³Óɸ½à»îÎÁ¡¡standard reference material
ʬÎॳ¡¼¥É¡§150101, 150402