Fitzgerald R
Physics Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
Appl Radiat Isot. 2010 Jul-Aug;68(7-8):1507-9. doi: 10.1016/j.apradiso.2009.12.008. Epub 2010 Jan 19.
I report on the operation and characterization of a new ionization chamber system, "AUTOIC", featuring a commercial digital electrometer and a commercial robotic sample changer. The relative accuracy of the electrometer was improved significantly beyond the manufacturer's specifications through an in-house calibration of the various ranges, applied via software. The measurement precision and repeatability of the system have been determined by measuring multiple samples of the same radionuclide over the span of two or three years. The linearity of the system was examined by following the decay of (99m)Tc, (99)Mo and (133)Xe sources for up to 19 half-lives and determining half-life values. All of these values agree with the accepted literature values, within their combined uncertainties.
我报告了一种新型电离室系统“AUTOIC”的运行和特性，该系统配备了一台商用数字静电计和一台商用自动进样器。通过软件进行内部校准，静电计的相对精度显著提高，超出了制造商的规格。该系统的测量精度和重复性是通过在两到三年的时间跨度内对多个相同放射性核素的样品进行测量来确定的。通过跟踪（99m）Tc、（99）Mo和（133）Xe源长达19个半衰期的衰变并确定半衰期值，来检验系统的线性。所有这些值在其综合不确定度范围内与公认的文献值一致。
