Models for polymeric and anisotropic liquids by Martin Kr????ger

By Martin Kr????ger

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TABLE 8. Quadratic fit coefficients, for the calculation of ks by the “two-voltage” technique in pulsed radiation, as a function of the voltage ratio V1/V2. 3. APPROPRIATE VALUES FOR KQ Values for kQ are dependent on the type of ionization chamber and on the quality of radiation (type, energy, machine). Appropriate values are provided in the IAEA Code of Practice TRS 398. 25 and 25 g/cm2 Heavy ions with Z between 2 (He) and 18 (Ar) having a practical range in water, Rp, of 2–30 g/cm2 kQ does not only depend on the type of radiation but additionally on its quality.

However, some influence quantities cannot be controlled, for example air pressure and humidity, or dose rate in 60Co gamma radiation. The effect of these influence quantities can be taken into account by applying appropriate correction factors. Assuming that influence quantities act independently from each other, a product of correction factors is applied: uncorrected MQ = MQ ⋅ ∏ ki (12) where ki refers to the different influence quantities. 1. Air temperature and air pressure T0 and P0 are the reference conditions for chamber air temperature (in °C) and pressure.

E. using Peff) is taken into account in the calibration factor, or in the quality correction factor. g. Tab. 6). TABLE 6. Positioning of the reference point of a cylindrical chamber with inner radius r according to IAEA TRS 398. 2. DETERMINATION OF CHARGE UNDER REFERENCE CONDITIONS The numerical value of the calibration factor and that of the quality correction factor are applicable only if the reference conditions are fulfilled. Reference conditions are described by a set of values of influence quantities.

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