MEASUREMENTS OF NUMBER OF RADIOACTIVE ATOMS AND HALF-LIFE(Ⅲ)

FENG XI-ZHANG; ZHAO ZHEN-LAN; GUO YING-HUAN; LO SHI-HUA; XU YUAN-BIAO; YANG RUI-YING; HUANG ZHONG-XIANG; JIANG YONG

Chinese Physics C> 1982, Vol. 6> Issue(5) : 642-647

MEASUREMENTS OF NUMBER OF RADIOACTIVE ATOMS AND HALF-LIFE(Ⅲ)

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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.

References

[1]	冯锡璋、赵珍兰、汤乃助,高能物理与核物理,6(1980), 771.[2] 冯锡璋等,高能物理与核物理,6(1981), 754.[3] 冯锡璋等,高能物理与核物理,1(1982); 111.

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[17]	FENG Xi-Zhang , ZHAO Zhen-Lan , GUO Ying-Huan , LUO Shi-Hua , YANG Rui-Ying , HUANG Zhong-Xiang , JIANG Yong . MEASUREMENT OF NUMBER OF RADIOACTIVE ATOMS AND HALF-LIFE (Ⅳ)—Applications and Accuracy of N₀. Chinese Physics C, 1983, 7(1): 114-117.
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[20]	Feng Xi-zhang , Zhao Zhen-lan , Tang Nai-xun . SELECTION OF THE MEASURING TIME IN THE ABSOLUTE COUNTING OF RADIOACTIVITY. Chinese Physics C, 1980, 4(6): 771-773.

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FENG XI-ZHANG, ZHAO ZHEN-LAN, GUO YING-HUAN, LO SHI-HUA, XU YUAN-BIAO, YANG RUI-YING, HUANG ZHONG-XIANG and JIANG YONG. MEASUREMENTS OF NUMBER OF RADIOACTIVE ATOMS AND HALF-LIFE(Ⅲ)[J]. Chinese Physics C, 1982, 6(5): 642-647.

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Received: 1981-05-03
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

MEASUREMENTS OF NUMBER OF RADIOACTIVE ATOMS AND HALF-LIFE(Ⅲ)

Received Date: 1981-05-03

Accepted Date: 1900-01-01

Available Online: 1982-10-05

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.

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MEASUREMENTS OF NUMBER OF RADIOACTIVE ATOMS AND HALF-LIFE(Ⅲ)

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