Abstract
Abstract The concept of the recombination index of quality (RIQ) is based on the degree of initial recombination and was introduced to provide a measurable quantity of radiation quality. The RIQR values can be determined employing a high pressure ionisation chamber operated under saturation conditions and at a suitable collecting potential, UR. Experiments were performed with various types of radiation including monoenergetic neutrons with energies of 0.9, 2.1, 5.5 and 14 MeV, polyenergetic neutrons (Pu-Be and 252Cf with different filters), high energy protons and alpha particles from natural uranium. To obtain RIQ values for neutrons alone, the photon component of the total absorbed dose was determined using the twin chamber technique and the photon component was subtracted from the total RIQ. It is shown that RIQ4 values can estimate with good accuracy the quality factor values (ICRP 1973). RIQ1 (or RIQ0.5/1 determined from measurements at saturation and two voltages) can be used for estimation of QF values recently proposed by ICRU. The expected independence of RIQ4 on filling gas pressure was confirmed experimentally for a Pu-Be source.
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