(n,gamma)法用モリブデン吸着材の99Mo吸着及び99mTc溶離特性; RI製造に関する照射技術(STC No.2-II)に関する共同実験報告書(共同研究)

Japan Materials Testing Reactor (JMTR) of the Japan Atomic Energy Agency (JAEA) has a plan to produce $^{99}$Mo, which is the parent nuclide of radiopharmaceutical $^{\rm 99m}$Tc, by (n,$\gamma$) method. The $^{99}$Mo adsorption and $^{\rm 99m}$Tc elution characteristics of molybdenum adsorbents should be evaluated since the specific activity of $^{99}$Mo obtained by (n,$\gamma$) method is low. Therefore, $^{99}$Mo adsorption and $^{\rm 99m}$Tc elution tests with molybdenum adsorbents for the (n,$\gamma$) method such as poly-zirconium compound (PZC) and molybdate zirconium gel were carried out under cooperation with the Kazakhstan National Nuclear Energy Center (NNC). As a result, the $^{99}$Mo adsorption performance of the adsorbents was the same level as conventional data, whereas the $^{\rm 99m}$Tc elution performance of the adsorbents was lower than conventional data. The $^{99}$Mo adsorption and $^{\rm 99m}$Tc elution performance will be investigated again in future.

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