(18)F primary standard at ENEA-INMRI by three absolute techniques and calibration of a well-type IG11 ionization
Marco Capogni1, Pierluigi Carconi1, Pierino De Felice1
1ENEA, Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti (INMRI), C.R. Casaccia, Via Anguillarese, 301, I-00123 Rome, Italy.
Abstract:
A new (18)F primary standardization carried out at ENEA-INMRI by three different absolute techniques, i.e. 4πγNaI(Tl)γ high-efficiency counting, TDCR and 4πβ(LS)-γ[NaI(Tl)] coincidence counting method, allowed the calibration of a fixed well-reentrant IG11 ionization chamber (IC), with an uncertainty lower than 1%, and to check the calibration factor of a portable well-type IC NPL-CRC model, previously calibrated. By the new standard the ENEA-INMRI was linked to the BIPM International Reference System (SIR) through the BIPM SIR Transfer Instrument (SIRTI).
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