Determination of the quality factor in a mixed field of gamma-rays and neutrons by an ionization chamber filled with a dielectric liquid, II

Instrumentation for Environmental Monitoring: Radiation.

“…More recently, values of quality factor and dose equivalent have been obtained by comparison of the current in two such ionization chambers operated with widely different collecting potentials (Sullivan, 1964;Distenfeld and Markoe, 1965); the use of multlplate chambers has also been tested (Zielczynskl, et al, 1964). While these developments are still experimental and not commercially available, they are promising and, like the LET spectrometer approach discussed above, may lead to a practical dose equivalent meter applicable to any type of radiation."Work on the basic properties of liquid filled ionization chambers (Blanc, et al, 1963;Ladu, et al, 1967), indicated that, by use of a property of liquid dielectrics, it may be possible to determine the effective quality factor of a mixed radiation field. For this type of detector, the ionization current (I) is said to be a linearly Increasing function of the collecting voltage V for sufficiently high values of the applied electric field i.e., I = R(hV + k), where R is the intensity of the radiation and h and k are two constants whose values depend upon the nature of the radiation, the chamber geometry and the dielectric.…”