韓國에너지硏究所 同位元素室에서 製造하여 使用者에게 供給하는 Molybdenum의 放射性同位元素인 99M0에 대하여 放出하는 감마 放射線을 檢出하고 그 에너지를 測定하여 崩壞形態를 調査하였다. 實驗은 美國 Tracor Northern 社製 model NO. TN-1750, 1024 Multichannel γ-Ray Spectrometer System을 利用하여 標準 γ放射能 試料 22Na의 γ-ray spectrum을 測定하여 에너지 511keV와 1275keV에 해당하는 photopeak의 channel number 140 및 314를 택하여 tow point method로 channel number대 energy의 補正式을 作成하고 이것에 의거하여 同一한 條件으로 測定한 實驗試料 99Mo의 γ-ray spectrum을 얻어 放出하는 γ線의 에너지를 구하였다. 이것을 標準値와 比較檢討한 結果 그 誤差가 2keV以下로 대단히 적은 優秀한 製品임이 確認되었다.

In this study, the decay form of 99Mo which is supplied by Korea Advanced Energy Research Institude (KAERI) had been investigated from the analysis of γ-ray energy spectrum radiating from the radioactive element 99Mo. The γ-ray energy spectrum was obtained using NaI (T1) scintillation detector and multichannel pulse height analyzer. The calibration curve and formula for γ-ray energy versus channel number were made from the two photopeaks of standard radioactive source 22Na, 140 and 314 channel corresponding to the γ-ray energy of 511 keV and 1275 keV, respectively. The γ-ray energies from 99Mo were detected at the same condition with the standard source, and compared with standard energies of 99Mo Experimental results show that the γ-ray energies from the sample are in good agreement with the values of standard source within energy error of 2 keV, which means that the 99Mo supplied by the KAERI can be used as a standard radioactive source.