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首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >Construction and implementation of the NIST triple-to-double coincidence ratio (TDCR) spectrometer.
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Construction and implementation of the NIST triple-to-double coincidence ratio (TDCR) spectrometer.

机译：NIST三重对偶符合率（TDCR）光谱仪的构建和实施。

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摘要

A description of the triple-to-double coincidence ratio (TDCR) spectrometer recently constructed at NIST and results of tests to assess its operating characteristics are presented. Measured activities for previously calibrated solutions of (3)H (tritiated water) and (63)Ni agreed with certified activity values to within 0.04% and 0.2%, respectively. Agreement between measurements of solutions containing (90)Y using the TDCR and the CIEMAT/NIST efficiency tracing method was achieved to within 0.7% and within the respective experimental uncertainties. A difference of 5.3% was observed between TDCR measurements and the certified massic activity value for a calibrated solution containing (54)Mn, but because of the large uncertainty on the TDCR result (3.6% relative standard uncertainty), the values agree to within the experimental uncertainties. Agreement to within experimental uncertainties (2%) for (103)Pd was achieved with the TDCR and CIEMAT/NIST methods, but not between TDCR and isothermal calorimetric measurements. TDCR results for a (204)Tl solution were in excellent agreement (maximum difference of 0.2% with any other method, with combined standard uncertainty of 0.45% on TDCR result) with results obtained using three other methods.
机译：介绍了最近在NIST建造的三重/双重合比（TDCR）光谱仪的描述以及评估其运行特性的测试结果。先前校准的（3）H（（水）和（63）Ni溶液的活度测量值与经认证的活度值分别在0.04％和0.2％之内。使用TDCR和CIEMAT / NIST效率追踪方法测量的含（90）Y的溶液之间的一致性达到0.7％以内，并且在各自的实验不确定性范围内。对于含（54）Mn的校准溶液，TDCR测量值与经认证的质量活度值之间存在5.3％的差异，但由于TDCR结果存在较大的不确定性（相对标准不确定性为3.6％），因此在实验不确定性。用TDCR和CIEMAT / NIST方法在（103）Pd的实验不确定度（2％）内达成了一致，但在TDCR和等温量热测量之间却没有达成一致。 （204）T1溶液的TDCR结果具有极好的一致性（任何其他方法的最大差异为0.2％，TDCR结果的组合标准不确定度为0.45％）与使用其他三种方法获得的结果。

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