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1. Introduction
Among the fission products present in high-level radioactive waste (HLW),79Se certainly deserves more attention: this radioelement of long half-life is present in sufficiently large amount in irradiated nuclear fuel to give a significant contribution to the dose rate to man once it escapes from the engineered barrier system. The half-life of 79Se is uncertain but comprised in the range 65000 years to 1.1 MY (Singh, 2002; Jiang et al., 2002).

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    Ôڸ߷ÅÉäÐԺ˷ÏÁÏ(HLW)µÄÁѱä²úÎïÖÐ, 79Seµ±È»¸üÖµµÃ¹Ø×¢: °ëË¥ÆÚ³¤µÄ¸Ã·ÅÉäÐÔÔªËØ×ã¹»´óÁ¿µÄ´æÔÚÓÚ·øÉä¹ýµÄºËȼÁÏÖУ¬Ò»µ©´Ó¹¤³ÌÆÁÕÏÌåϵÖÐÒݳö£¬Ëü¶ÔÈ˵ķÅÉä¼ÁÁ¿ÂʵÄÓ°ÏìÊÇÊ®·ÖÏÔÖø£¨ÖÁ¹ØÖØÒª£©µÄ¡£79SeµÄ°ëË¥ÆÚ»¹²»È·¶¨£¬µ«ÔÚ65000Äêµ½110ÍòÄê(Singh, 2002; JiangµÈ, 2002) ·¶Î§ÄÚ¡£
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