【摘要】 本文从理论上探索了在放射性绝对测量中,降低由衰变常数的不准确性和测量统计性所引入的误差。发现以寿期为中心的前后对称测量法可以达到这样的要求,即使衰变常数的误差达到±10％,由零时和两个寿期时测量的结果,分别计算得出的在零时的放射性原子数的平均值由衰变常数的不准确性引入的误差仍小于0.1％。用^99mTc衰变的实验数据,在测量统计性范围内证实了以上论点。故,用以寿期为中心的前后对称测量法,将测量时间尽量提前,既可减少由衰变常数的不准确性所引入的误差,又可有较好的测量统计性,使绝对测量的结果更准确。更多还原

【Abstract】 The present paper examines theoretically the way of reducing tha errors introducedby the inaccuracy of the decay constant and measuring statistics in the determinationof the number of the radioactive atoms. It was discovered that the "front-back sym-metrical measurements with life-time as center" （FBSLC） may fulfil this reguirement.Even if the error of the decay constant reaches ±10%, the error introdnced by theinaccuracy of decay constant of the number of the radioactive atoms at zero time cal-culated from the radioactivities measured at zero time and two life-times by takingaverage will still be smaller than 0.1%. Experimental data of ^99mTc radioactive decaywithin measuring statistics verified the above theoretical prediction. Therefore, by FBSLC with measuring time as early as possible, it is possible toreduce the errors introduced by inaccuracy of the decay constant and measuring sta-tistics, so that the results of the absolute measurements may be more accurate.更多还原