The Russian (VNIIM) and French (BNM-LNHB) national primary laboratories organized in 1997 a bilateral comparison in beta dosimetry. This comparison of national standards, EUROMET.RI(I)-S2.B2, was carried out through a transfer ionization chamber manufactured by the VNIIM. The calibration factors of this chamber were determined by both laboratories in terms of absorbed dose rate at 7 mg.cm-² of tissue depth, for the beta radiation fields of 90 Sr-90 Y, 204 Tl and 147 Pm.
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