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Calibration of (55)Fe activity with a lithium-drifted silicon detector
Akira Yunoki1, Takahiro Yamada, Yasushi Sato
1National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan. a.yunoki@aist.go.jp
Abstract:
NMIJ participated in the CCRI (II) key comparison of (55)Fe activity measurement. A planar-type Si(Li) detector and a liquid-scintillation counter were used to calibrate the activity. The calibration result obtained by the Si(Li) detector agreed with that obtained by the liquid-scintillation counter using the CIEMAT/NIST method within uncertainty. The result was reported to the BIPM in 2006. The activity of (55)Fe was also measured by using a 2pi pressurized proportional counter. The result obtained by the 2pi pressurized proportional counter agreed with the above results within uncertainty. The measurement by the Si(Li) detector was very simple and its procedure was a combination of conventional methods. The measurement by the liquid-scintillation counter is most popular to calibrate the activity of (55)Fe. However the Si(Li) detector is also useful.
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