Soares C G
National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
Med Phys. 1995 Sep;22(9):1487-93. doi: 10.1118/1.597416.
Since the resumption of the NIST calibration service for 90Sr+90Y beta-particle ophthalmic applicators, 65 sources have been calibrated using the revised technique [C. G. Soares, Med. Phys. 18, 787-793 (1991)]. For 59 of these sources, the manufacturer's calibration results were available for comparison to the NIST calibration results. The 59 sources represent eight different manufacturers, only one of which is still selling new sources. Manufacturer calibration dates range from the present back to 1954. The results of the comparisons are present, broken down by both manufacturer and calibration date; there are interesting and significant trends in both, with average differences of 20% not uncommon. The obsolete unit, "roentgen-equivalent-beta" (reb), in which some of the manufacturer calibrations are expressed, is discussed, and a factor (0.00982 Gy reb-1) for its conversion to absorbed dose is suggested.
自从美国国家标准与技术研究院（NIST）恢复对90Sr+90Yβ粒子眼科敷贴器的校准服务以来，已经使用修订后的技术[C.G.索亚雷斯，《医学物理》18，787 - 793（1991年）]对65个源进行了校准。对于其中59个源，可获得制造商的校准结果以便与NIST的校准结果进行比较。这59个源代表了八个不同的制造商，其中只有一家仍在销售新源。制造商的校准日期从现在追溯到1954年。给出了按制造商和校准日期分类的比较结果；两者都存在有趣且显著的趋势，平均差异达20%并不罕见。讨论了一些制造商校准中所采用的已过时单位“伦琴当量β”（reb），并建议了一个将其转换为吸收剂量的因子（0.00982 Gy reb-1）。
