Êü¼ÍÀþÍøÍѵ»½Ñ¥Ç¡¼¥¿¥Ù¡¼¥¹¤Î¥á¥¤¥ó¥Ú¡¼¥¸¤Ø

ºîÀ®¡§ 1998/02/28 º´Êý¡¡¼þËÉ

¥Ç¡¼¥¿Èֹ桡¡¡¡¡¡§030056
Ì©Éõ¾®Àþ¸»¼£ÎÅÍѳ˼ï¤Î¼ïÎà¤ÈÆÃħ
ÌÜŪ¡¡¡¡¡¡¡¡¡¡¡¡¡§Ì©Éõ¾®Àþ¸»¼£ÎŤËÍѤ¤¤ëÀþ¸»³Ë¼ï¤Î¼ïÎà¤ÈÀ­¼Á¤ÎÀâÌÀ
Êü¼ÍÀþ¤Î¼ïÊÌ¡¡¡¡¡§¥¨¥Ã¥¯¥¹Àþ,¥Ù¡¼¥¿Àþ,¥¬¥ó¥ÞÀþ,ÃæÀ­»Ò
Êü¼ÍÀþ¸»¡¡¡¡¡¡¡¡¡§Êü¼ÍÀ­³Ë¼ï
ÀþÎÌ¡ÊΨ¡Ë¡¡¡¡¡¡¡§0.2Gy/hr¡Á10Gy/min
ÍøÍÑ»ÜÀß̾¡¡¡¡¡¡¡§É±¡Åù¤ÎÊü¼ÍÀþ¼£ÎÅÉôÌç
¾È¼Í¾ò·ï¡¡¡¡¡¡¡¡¡§¿ÍÂÎÁÈ¿¥Æâ¡¢¿ÍÂιÐÆâ¡¢¿ÍÂÎÈéÉæɽÌÌ
±þÍÑʬÌî¡¡¡¡¡¡¡¡¡§°å³Ø, Êü¼ÍÀþ¼£ÎÅ

³µÍס¡¡¡¡¡¡¡¡¡¡¡¡§
¡¡Ì©Éõ¾®Àþ¸»¼£ÎŤËÍѤ¤¤é¤ì¤ë³Ë¼ï¤Ï½¾ÍèRa¤Î¤ß¤Ç¤¢¤Ã¤¿¤¬¡¢Êü¼ÍÀ­Æ±°Ì¸µÁǹ©³Ø¤ÎȯŸ¤Ë¤è¤ê¡¢¸½ºß¤Ç¤Ï¤¤¤¯¤Ä¤«¤è¤ê¼£ÎŤËŬ¤·¤¿³Ë¼ï¤¬³«È¯¤µ¤ì¤Æ¤¤¤ë¡£Ì©Éõ¾®Àþ¸»¤È¤Ï¡¢¾¯Î̤Τ³¤ì¤é³Ë¼ï¤ÎÊü¼ÍÀ­Æ±°Ì¸µÁǤò¾®·¿¤ÎÍÆ´ï(¥«¥×¥»¥ë¤È¤¤¤¦)¤ËÌ©Éõ¤·¤¿¤â¤Î¤Ç¡¢Î×¾²¾å¤ÎÍ×µá¤Ë±þ¤¨¤ë¤¿¤á¡¢¼ï¡¹¤Î·Á¾õ(¿Ë,´É,¥ï¥¤¥ä,¥Ô¥ó,¥·¡¼¥É¤ª¤è¤ÓRALSÍѤʤÉ)¤ä¡¢¥¨¥Í¥ë¥®¡¼¡¢ÀþÎÌΨ¤ª¤è¤ÓȾ¸º´ü¤ò»ý¤ÄÀþ¸»¤¬À½ºî¤µ¤ìÍøÍѤµ¤ì¤Æ¤¤¤ë¡£

¾ÜºÙÀâÌÀ¡¡¡¡¡¡¡¡¡§
¡¡Ì©Éõ¾®Àþ¸»(°Ê²¼, ¾®Àþ¸»¤È¤¹¤ë)¼£ÎŤȤϡ¢Èæ³ÓŪ¾®À£Ë¡¡¦¾¯Î̤ÎÊü¼ÍÀ­³Ë¼ï¤òÂÎÁÈ¿¥Æâ¤ËÁÞÆþ¤·¤¿¤ê¡¢¤¢¤ë¤¤¤Ï¶Ë¶á˵¤ËÇÛÃÖ¤·¤ÆÊü¼ÍÀþ¾È¼Í¤ò¹Ô¤¦¤â¤Î¤Ç¤¢¤ë¡£¤³¤Î¼£ÎŤËÍѤ¤¤é¤ì¤ëÀþ¸»¤Ï¡¢¡Ö°åÎÅË¡»Ü¹Ôµ¬Â§¡×¤Î¿ÇÎÅÍÑÊü¼ÍÀþ´ï¶ñ(RALSÁõÃÖ¤Ç3.7GBq°Ê¾å¤ÎÀþ¸»¤òÁõÈ÷¤¹¤ë¤â¤Î¤Ï¿ÇÎÅÍÑÊü¼ÍÀþ¼£ÎÅÁõÃÖ)¤ËÁêÅö¤¹¤ë¤â¤Î¤Ç¡¢¤½¤Î»ÈÍѤËÅö¤¿¤Ã¤Æ¤Ï¡Ö°åÎÅË¡¡×¡¢¡ÖÊü¼ÍÀ­Æ±°Ì¸µÁǤˤè¤ëÊü¼ÍÀþ¾ã³²¤ÎËɻߤ˴ؤ¹¤ëˡΧ¡×¤ª¤è¤Ó¤½¤Î¾´ØÏ¢¤ÎˡΧ¤Îµ¬À©¤ò¼õ¤±¤ë¡£
¡¡°ìÈÌŪ¤Ë¡¢¾®Àþ¸»¤Ëµá¤á¤é¤ì¤ë¾ò·ï¤È¤·¤Æ¤Ï¡¢­¡²½³ØŪ¤Ë°ÂÄê¤Ç¤¢¤ë¤³¤È¡¢­¢¥³¥¹¥È¤¬Ç¼ÆÀ¤Ç¤­¤ëÈϰϤǤ¢¤ë¤³¤È¡¢­£¦Ã¤ª¤è¤Ó¦ÂÀþ¤Î¥¨¥Í¥ë¥®¡¼¤¬Ä㤤¤¢¤ë¤¤¤Ï¦ÂÀþ¤òÊü½Ð¤·¤Ê¤¤(ÈïÇøËɸî¤Î¤¿¤á¤Î¼×Ê䪤è¤ÓÀþ¸»ÍÆ´ï¤ò´Êñ¤Ë¤Ç¤­¤ë)¤³¤È¡¢­¤ÈæÊü¼Íǽ¤¬¹â¤¯¥µ¥¤¥º¤ª¤è¤Ó·Á¾õÅù¤ÎÀþ¸»À½ºî¾å¤Ç¤Î½ÀÆðÀ­¤¬¹â¤¤¤³¤È¡¢­¥ÇË»»þ¤Î½èÍý¤¬Íưפʤ³¤È¡¢¤Ê¤É¤¬µó¤²¤é¤ì¤ë¡£¸½ºß¡¢¤³¤ì¤é¤Î¾ò·ï¤òËþ¤¿¤¹¤¤¤¯¤Ä¤«¤Î³Ë¼ï¤¬³«È¯¤µ¤ì¼£ÎŤ˶¡¤µ¤ì¤Æ¤¤¤ë¡£É½1¤Ë¼ç¤Ê¾®Àþ¸»Íѳ˼浪¤è¤Ó¤½¤ÎÀ­¼Á¤ò¼¨¤¹¡£

ɽ1¡¡¾®Àþ¸»¼£ÎŤËÍѤ¤¤é¤ì¤ë³Ë¼ï¤È¤½¤ÎÆÃÀ­¡£¡Ê¸¶ÏÀʸ1¤è¤ê°úÍÑ¡Ë
 ----------------------------------------------------------------------------- 
                                                              Ⱦ²ÁÁØ (cm) 
                                 ¾È¼ÍÀþÎÌ   ¦ÃÀþ¤ÎÊ¿¶Ñ¥¨   ------------------ 
  ³Ë¼ï    ²õÊÑ·Á¼°    Ⱦ¸º´ü      ΨÄê¿ô*   ¥Í¥ë¥®¡¼(MeV)    ±ô  ¥³¥ó¥¯¥ê¡¼¥È
 ----------------------------------------------------------------------------- 
   60Co    ¦Â-        5.271ǯ       2.532       1.25         1.3      6.2
  137Cs    ¦Â-        30.17ǯ       0.634       0.662        0.65     5.0
  192Ir    ¦Â-        74.0 Æü       0.908       0.35         0.57     4.1
     Ra  ¥¦¥é¥ó·ÏÎó   1600 ǯ       1.600       0.78         1.7      7.0
 ----------------------------------------------------------------------------- 
  198Au    ¦Â-        2.696Æü       0.462       0.41         0.51     4.1
  125I     EC         60.2Æü        0.281       0.028        0.002    0.3
  103Pd    EC         17.0Æü        0.287       0.021        0.001
  222Rn  ¥¦¥é¥ó·ÏÎó   3.824Æü       1.600       0.78         1.7      7.0
 ----------------------------------------------------------------------------- 
  252Cf    ¦Á         2.64ǯ       ¦Ã:1.14      ¦Ã:0.8           5cm (¿å) 
          Fission                  n:2.13       n:2.348
  90Sr    ¦Â-        28.8ǯ                     ¦Â:2.27
 ----------------------------------------------------------------------------- 
 *ñ°Ì¡§x10-18Ckg-1m2s-1Bq-1. Ra¤Ï 0.5mmPtßɲá¸å¤ÎÃÍ, 222Rn ¤Ï´â¸¦¶¡µëÃÍ¡¢¤½¤Î¾¤Ï̵ßɲá
¡¡¤³¤³¤ÇRa¤ª¤è¤Ó¤½¤Î̼³Ë¼ï¤Ç¤¢¤ë 222Ra¤Î»ÈÍѤϸ½ºßµÞ®¤Ë¸º¾¯¤·¤Ä¤Ä¤¢¤ë¤¬¡¢Â¾¤Î³Ë¼ï¤È¤ÎÈæ³Ó¤Î¤¿¤áɽ£±¤Ë¼¨¤·¤¿¡£¤Ê¤ª¡¢Ra¤Ï¥¦¥é¥ó·ÏÎó¤Ë°¤¹¤ë¼«Á³Êü¼ÍÀ­Æ±°Ì¸µÁǤǤ¢¤ê¡¢º£À¤µª½é¤á¤è¤êŤ¤´Ö¿ÍÎबÍѤ¤¤ë¤³¤È¤Î¤Ç¤­¤ëÍ£°ì¤ÎÊü¼ÍÀþ¼£ÎÅÍѤΦÃÀþ¸»¤Ç¤¢¤Ã¤¿¡£¤·¤«¤·¡¢¤½¤Î²õÊÑÀ¸À®Êª¤¬¥¬¥¹¾õ¤Ç¤¢¤ê¡¢ÍÆ´ï¤ÎÇË»¤Ëȼ¤¦´Ä¶­±øÀ÷¤Î²ÄǽÀ­¤Î¹â¤¤¤³¤È¤¬»ØŦ¤µ¤ì,¹ñºÝÊü¼ÍÀþËɸî°Ñ°÷²ñ(ICRP)¤«¤é»ÈÍѤòÄä»ß¤¹¤ë¤³¤È¤¬´«¹ð¤µ¤ì¤Æ¤¤¤ë¡£¸½ºßRa¤Ï¤½¤Î̼³Ë¼ï¤Î 222Rn¤È¤È¤â¤Ë¡¢¾®Àþ¸»Íѳ˼ï¤È¤·¤Æ¤ÎÎò»ËŪ»ÈÌ¿¤ò½ª¤¨¤è¤¦¤È¤·¤Æ¤¤¤ë¡£¤½¤Î¾¤Î¿·¤·¤¤³Ë¼ï¤Ï, Âè2¼¡ÂçÀï¸å¤Î¸¶»Òϧµ»½Ñ¤ÎȯŸ¤Ë¤è¤êÅо줷¤Æ¤­¤¿¤â¤Î¤Ç¡¢Ra¤ËÈæ¤Ù, ²õÊÑÀ¸À®Êª¤Î¤³¤È°Ê³°¤Ë¤â, ¾®Àþ¸»¼£ÎÅÍѳ˼ï¤È¤·¤Æ¤¤¤¯¤Ä¤«¤ÎÍøÅÀ¤òÍ­¤·¤Æ¤¤¤ë¡£É½1¤Ë¤ª¤¤¤Æ¡¢¼£Îŵ»½Ñ¤è¤ê¸«¤Æ60Co, 137Cs, 192Ir¤Î¤è¤¦¤ËȾ¸º´ü¤ÎŤ¤°ì»þÁõÃå¼£ÎÅÍѤÈ198Au,125I,103Pd¤Î¤è¤¦¤ÊÈæ³ÓŪȾ¸º´ü¤Îû¤¤±Êµ×»ÉÆþÍѤËʬ¤±¤é¤ì¤ë¡£¤Þ¤¿, Àþ¸»Áàºî¤ÎÅÀ¤è¤êʬÎह¤ì¤Ð¡¢°ìÉô¤Þ¤¿¤ÏÁ´Éô¤ÎÁàºî¤ò¼êºî¶È¤Ç¹Ô¤¦ÍѼêŪ¼£ÎŤËÍѤ¤¤ëÄãÀþÎÌΨÀþ¸»¤È¡¢±ó³ÖÁàºî¼°¥¢¥Õ¥¿¥í¡¼¥Ç¥£¥ó¥°Ë¡ (°Ê²¼, RALS-Remotely controlled Afterloading System¤È¤¹¤ë)¤Ç¤Î»ÈÍѤμçή¤Ç¤¢¤ë¹âÀþÎÌΨÀþ¸»¤Î2¼ïÎà¤È¤Ê¤ë¡£
¡¡°ì»þÁõÃå¼£ÎŤǤϡ¢Àþ¸»¤òÁõÃå¸å¡¢Í½Äꤷ¤¿ÀþÎ̤¬´µÉô¤ËÍ¿¤¨¤é¤ì¤¿¤é¤³¤ì¤òÈ´µî¤¹¤ë¡£¤è¤Ã¤Æ¡¢Àþ¸»¤ò·«¤êÊÖ¤·»ÈÍѤ¹¤ë¤³¤È¤¬²Äǽ¤Ç¡¢È¾¸º´ü¤â¤ª¤è¤½1ǯ°Ê¾å¤ÎĹ¼÷Ì¿³Ë¼ï¤¬ÍѤ¤¤é¤ì¤Æ¤¤¤ë(192Ir¤ò½ü¤¯)¡£
¡¡±Êµ×»ÉÆþ¼£ÎŤǤϡ¢ÄãÀþÎÌΨ¤ÎÀþ¸»¤òÂÎÆâ¤Ø±Êµ×¤ËÊüÃÖ¤¹¤ë¡£¤è¤Ã¤Æ¡¢¤½¤Î·Á¾õ¤Ï¾®¤µ¤¤Î³¾õ¤Ç¤¢¤ê¡¢È¾¸º´ü¤â¤ª¤è¤½ 100Æü°Ê²¼¤Èû¤¤¡£²áµîŤ¤´ÖÍ£°ì¤Î±Êµ×»ÉÆþÍÑÀþ¸»¤Ç¤¢¤Ã¤¿ 222Rn¥·¡¼¥É¤Ï´û¤Ë»Ñ¤ò¾Ã¤·¡¢¤³¤ì¤ËÂå¤ï¤ë 198Au¥°¥ì¥¤¥ó¤¬º£Æü¤Ç¤Ï¹­¤¯ÍѤ¤¤é¤ì, ²¤ÊƤǤÏÄ㥨¥Í¥ë¥®¡¼³Ë¼ï¤Ç¤¢¤ë125I¤ª¤è¤Ó 103Pd¥·¡¼¥É¤Ë¤è¤ë¼£ÎŤâ»Ï¤Þ¤Ã¤Æ¤¤¤ë¡£
¡¡ÍѼêŪ¼£ÎŤËÍѤ¤¤é¤ì¤ë¡¢¦ÃÀþ¸»¤È¤·¤Æ¤Ï60Co,137Cs,192Ir¤Ê¤É¤¬¤¢¤ê¡¢¦ÂÀþ¸»¤Ë¤Ï90Sr¤¬¤¢¤ë¡¢¤Þ¤¿ÃæÀ­»ÒÀþ¸»¤Ë¤Ï 252Cf¤Ê¤É¤Î³Ë¼ï¤¬¤¢¤ê¡¢¤¤¤º¤ì¤âÄãÀþÎÌΨ¤ÎÀþ¸»¤È¤·¤ÆÍѤ¤¤é¤ì¤ë¡£¤Þ¤¿¡¢·Á¾õ¤È¤·¤Æ¤Ï¡¢Î×¾²¾å¤ÎÍ×µá¤Ë¹ç¤ï¤»¡¢¿Ë¡¢´É¡¢¥Ô¥ó¡¢¥ï¥¤¥ä¡¢¥·¡¼¥É¤Ê¤É¿ÍͤʷÁ¾õ¤Î¤â¤Î¤Ë²Ã¹©¤µ¤ì¤ë¡£RALS¤ÎÂçÉôʬ¤Ï¹âÀþÎÌΨ¼£ÎŤǡ¢Àþ¸»³Ë¼ï¤È¤·¤Æ60Co¤ª¤è¤Ó 192Ir¤¬ÍѤ¤¤é¤ì¤ë¤¬¡¢°ìÉô 137Cs¤ò»ÈÍѤ·¤¿Ã桦ÄãÀþÎÌΨ¤Î¤â¤Î¤â¤¢¤ë¡£

¥³¥á¥ó¥È¡¡¡¡¡¡¡¡¡§
¡¡½¾Íè, Ì©Éõ¾®Àþ¸»¼£ÎŤËÍѤ¤¤é¤ì¤ë³Ë¼ï¤Ï¡¢Ra¤Î¤ß¤Ç¤¢¤Ã¤¿¤¬Êü¼ÍÀþËɸî¾å¤ÎÍýͳ¤Ë¤è¤ê¤½¤Î»ÈÍѤ¬¶Ø»ß¤µ¤ì¤ë¤è¤¦¤Ë¤Ê¤Ã¤¿¡£
¡¡Ä㥨¥Í¥ë¥®¡¼¤Î°ì»þÁõÃåÀþ¸»¤È¤·¤Æ¡¢241Am(59.5keV,Ⱦ¸º´ü¡§432ǯ)¤ª¤è¤Ó145Sm(38-45keV,Ⱦ¸º´ü¡§340Æü)¤Ê¤É¤¬¾­Íè¤ÎÀþ¸»³Ë¼ï¤Î¸õÊä¤È¤·¤Æµó¤²¤é¤ì¤Æ¤¤¤ë¡£¤¿¤À¡¢¤³¤Î¤è¤¦¤Ê¤½¤ì¤¾¤ì¤ËÆÃÀ­¤Î°Û¤Ê¤Ã¤¿Àþ¸»¤Î»ÈÍѤϡ¢dosimetry ¤ÎÌ̤Ǥä¤äº®Íð¤ò¾·¤¤¤Æ¤¤¤ë¤³¤È¤ÏÈݤá¤Ê¤¤¡£
¡¡60Co±ó³Ö¼£ÎÅÁõÃÖ¤äľÀþ²Ã®´ï¤Ê¤É¤Î¹â¥¨¥Í¥ë¥®¡¼³°Éô¾È¼ÍÁõÃÖ¤ÎÉáµÚ¤Ê¤É¤Ë¤è¤ê¡¢¾®Àþ¸»¼£ÎŤÎÌò³ä¤Ï°ì»þ¸åÂष¤¿¡£¤·¤«¤·¡¢¸½ºß¤Ç¤Ï¡¢¥³¥ó¥Ô¥å¡¼¥¿¤òÍѤ¤¤¿ÀþÎÌ·×»»µ»½Ñ, ¥¢¥Õ¥¿¥í¡¼¥Ç¥£¥ó¥°Ë¡¤Ë¤è¤ëÈïÇø¤ÎÄ㸺²½, ±ó³ÖÁàºî¼°¥¢¥Õ¥¿¥í¡¼¥Ç¥£¥ó¥°Ë¡¤Ë¤è¤ë¼£ÎŤμ«Æ°²½¤È¾È¼Í»þ´Ö¤Îû½Ì¤Ê¤É¤Î¿·µ»½Ñ¤¬³«È¯¤µ¤ì, ¾®Àþ¸»¼£ÎŤÎŬ±þ¤ÏºÆ¤Ó³ÈÂ礷¤Ä¤Ä¤¢¤ë¡£¤µ¤é¤Ë¡¢¿Í¹©Êü¼ÍÀ­³Ë¼ï¤òÍѤ¤¤¿Ä㥨¥Í¥ë¥®¡¼¤«¤Ä¾®·¿¤ÎÀþ¸»¤Î½Ð¸½¤â¾­Íè¤Î¾®Àþ¸»¼£ÎŤÎȯŸ¤ò²Äǽ¤Ë¤·¤Ä¤Ä¤¢¤ë¡£

¸¶ÏÀʸ£± Data source 1¡§
Ì©Éõ¾®Àþ¸»¼£ÎŤÎÀþÎ̬ÄêË¡
º´Êý¡¡¼þËÉ
ÀéÍÕ¸©¤¬¤ó¥»¥ó¥¿¡¼Êü¼ÍÀþ¼£ÎÅÉôʪÍý¼¼
Êü¼ÍÀþ°å³ØʪÍý, Suppl. 50,6-43, 1997

»²¹Í»ñÎÁ£± Reference 1¡§
¼£ÎÅÍÑÌ©Éõ¾®Àþ¸»
º´Êý¡¡¼þËÉ
ÀéÍÕ¸©¤¬¤ó¥»¥ó¥¿¡¼Êü¼ÍÀþ¼£ÎÅÉôʪÍý¼¼
ÀÐÜ縲µÈ¡¢´ÛÌîÇ·ÃË¡¢ÉÙ±ÊÍΡ¢ÃæÂôÀµ¼£¡¢»³¸ýɧǷ¡¡ÊÔ½¸¡¢Êü¼ÍÀþ±þÍѵ»½Ñ¥Ï¥ó¥É¥Ö¥Ã¥¯, pp.461-467, 1990 Ä«ÁÒ½ñŹ

»²¹Í»ñÎÁ£² Reference 2¡§
Ì©Éõ¾®Àþ¸»¼£ÎÅÀßÈ÷µ¡´ï¤È¤½¤Î°ÂÁ´¼è°·¤¤Ë¡
º´Êý¡¡¼þËÉ, ÆâÅÄ¡¡·®
ÀéÍÕ¸©¤¬¤ó¥»¥ó¥¿¡¼Êü¼ÍÀþ¼£ÎÅÉôʪÍý¼¼, ´â¸¦µæ²ñ´â¸¦µæ½êʪÍýÉô
RADIOISOTOPES, Vol.36(3),pp.145-154, 1987

¥­¡¼¥ï¡¼¥É¡§Ì©Éõ¾®Àþ¸»¼£ÎÅ¡¢Brachytherapy, Ì©Éõ¾®Àþ¸»¡¢Sealed source, Êü¼ÍÀ­³Ë¼ï¡¢Radioactive nuclide¡¤ °ì»þÁõÃå¼£ÎÅ¡¢ÍѼêŪ¼£ÎÅ
ʬÎॳ¡¼¥É¡§030402,030203,030702

Êü¼ÍÀþÍøÍѵ»½Ñ¥Ç¡¼¥¿¥Ù¡¼¥¹¤Î¥á¥¤¥ó¥Ú¡¼¥¸¤Ø