【摘要】 <正> ⁹⁹Tc是目前在核医学上应用最广泛的放射性示踪核素。它发射的140 keVγ射线不但容易准直,而且足够用作人体内深部器官显像。由于它的半衰期比较短（6.02 h）,γ射线能量也较低,所以对病人的剂量比较小。通常,⁹⁹Tc系用生理盐水淋洗⁹⁹Mo-⁹⁹Tc发生器获得,在淋洗下大量^99mTc的同时,一些杂质也不同程度地淋洗下来了。显然,^99mTc淋洗液中的其它放射性杂质应该尽更多还原

【Abstract】 The principal radionuclidic impurities in ^99mTc eluates from fission ⁹⁹Mo-^99m99Tcgenerator made in Radioisotope Department of IAE have been measured by HPGeGamma-spectrometry. The contents of contaminants ¹³¹I, ⁹⁹Mo, ¹⁰³Ru, ¹³², ⁹⁵Zr,and ⁹⁵Nb in ^99mTc eluates were found within the regulations of the ChineseMinistry of Health.更多还原