用液体闪烁计数法测定^(147)Pm

THE DETERMINATION OF ^(147)Pm BY LIQUID-SCINTILLATION COUNTING TECHNIQUE

用液体闪烁计数法测量含α-羟基异丁酸、HNO_3和^(241)Am等杂质的^(147)Pm。研究了闪烁液用量、α-羟基异丁酸和HNO_3存在量对^(147)Pm测量的影响及有^(241)Am存在时的干扰情况;对^(147)Pm的仪器探测效率进行了刻度。在所选定的测量^(147)Pm条件下,被同时记录的^(241)Am不超过^(241)Am总计数的1%。方法还实测了核燃料后处理高放废液中经化学分离后的^(147)Pm的绝对含量,相对标准偏差<1%。

The method of measuring β particle of ^(147)pm directly in the solution which contains α-hydroxy isobutanoic acid (α-HIBA), HNO_3 and ^(241)Am is described in this report. The effect of scintiliquid(PPOPOPOP-naphthalene dioxane) and α-HIBA and HNO_3 on the measurement of ^(147)Pm is studied. The effect of ^(241)Am on the measurement of ^(147)pm is also studied. Relative counting efficiency in the measurement of ^(147)Pm for several measured solution is determined. If the activity of ^(147)Pm and ^(241)Am is about the same in the sample, they can be measured at a threshold of 1.40—5.35 V and 6.00—7.40 V respectively and interference is smaller than 1%. Absolute content of ^(147)Pm in 12 samples of high-level liquid waste was measured by this method. The results are satisfactory. The relative standard deviation of measurement for the same kind of samples is<1%.