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

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[2]	WANG Qing-Bin , Kazuyoshi Masumoto , Hideo Hirayama , Tokushi Shibata . A Measurement of the Residual Radioactivity with NaI Survey Meter and Its MC Simulation. Chinese Physics C, 2007, 31(11): 1071-1075.
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[18]	JIANG Dong-Xing . INCLUSIVE NEUTRON MULTIPLICITY IN HEAVY-ION COLLISION MEASURED BY A 4π NEUTRON DETECTOR. Chinese Physics C, 1990, 14(6): 537-541.
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[20]	WANG ZHENG-ZHI , MO WEN-CHUAN . KNO SCALING AND SCALING IN THE MEAN. Chinese Physics C, 1979, 3(5): 523-529.

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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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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.