Advisory Committee for the calibration standards of ionizing radiations

The C.C.E.M.R.I. (Comite Consultatif pour les Etalons de Mesure des Rayonnements Ionisants) comprises four sections: X and γ radiations, electrons; radionuclide measurement; neutron measurement; α energy standards. The activities of the four sections are reported, and the needs in calibration standards and international comparisons of radiation measurements according to planned duty programs and projects for future works are envisaged: international comparisons between exposure standards for 10-250 kV X-rays and 60Co photons; comparisons between absorbed doses for the 60Co gammas; development of an international system of calibration based on ionization chambers, precision in 4πβ(CP)-γ counting, and counting statistics; tests of transfer instruments intended for the comparison of fast neutron fluence rates, the neutron dosimetry for workmen protection and Cancer neutron therapy; extension of the list of calibration standards for α particle energies