【摘要】 4πβ+4πγ活度测量装置由4π流气式正比计数器、井型NaI(Tl)探测器和HPGe探测器构成。将4π流气式正比计数器放于HPGe探测器上,插入井型NaI(Tl)探测器井中,实现了β射线探测效率、活度和γ分支比的同时测量。测量了60Co、137Cs和166mHo的放射性核素活度,结果分别为:127.64(1±0.34%)、191.68(1±0.27%)和130.17(1±0.21%)Bq/mg,与国内外比对结果符合得很好;同时测量了137Cs和166mHo的主γ射线分支比,与文献值在不确定度范围内一致。更多还原

【Abstract】 <Abstrcat> A 4πβ+4πγ equipment for radioactivity measurement is made up of a 4π flow-gas proportional counter, a well-type NaI（Tl） detector and a HPGe detector. We place the 4πβ counter onto the HPGe detector and into the well of NaI（Tl） detector for carrying out the measurement of β-ray detection efficiency, radioactivity and γ-ray emission probability all the time. The radioactivity of （）⁶⁰Co, （）¹³⁴Cs and (（）^166mHo) were determined by 4πβ+4πγ method for radioactivity measurement, the result was 127.64（1±0.34%）Bq/mg for （）⁶⁰Co,191.68（1±0.27%） Bq/mg for （）¹³⁴Cs and 130.17（1±0.21%）Bq/mg for （）^166mHo , which were well agreed with the results of native or national compared measurement. And the mainγ-ray emission probability of （）¹³⁴Cs and （）^166mHo were also detemined and the results were accorded with the literature in uncertainty.更多还原