¹⁸F primary standard at ENEA-INMRI by three absolute techniques and calibration of a well-type IG11 ionization chamber

A new ¹⁸F 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). - Highlights: • New ¹⁸F primary standardization performed at ENEA-INMRI. • Absolute methods: 4πγ integral counting, TDCR and 4πβ(LS)-γ coincidence counting. • Two Ionization Chambers calibration: NPL-CRC Model and IG11. • New software code MAC4.cc for coincidence analysis in a beta(LS)-gamma system. • Link of the ENEA-INMRI to the BIPM SIR through the SIRTI instrument.