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IRMM participated in a recent international comparison for the standardization of a (204)Tl-solution organized by BIPM. The specific activity of the (204)Tl-solution was measured at IRMM using 3 independent methods; Liquidation Scintillation Counting using the CIEMAT/NIST method, 4pi-CsI counting and 4pi beta counting using a large pressurized proportional counter. This article describes the measurements in detail and discusses the potential problems in the standardization of (204)Tl.

Additional information

Authors: IRMM, ;JRC-GEEL, ;(BE),
Bibliographic Reference: Paper presented: ICRM 99, Prague (CZ), June 7-11, 1999
Availability: Available from Public Relations and Publications Unit, Ispra (IT)
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