Fluence-Based and Microdosimetric Event-Based Methods for by National Council on Radiation Protection and Measurements

By National Council on Radiation Protection and Measurements

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Extra info for Fluence-Based and Microdosimetric Event-Based Methods for Radiation Protection in Space (Ncrp Report, No. 137)

Example text

This assumes, of course, that there is a unique function of lineal energy that adequately describes the risk, so that it can be applied to all the radiations found in space. This assumption has yet to be verified. This approach has been tested, at least in one situation involving human exposures (Zaider and Varma, 1996). The study involved an evaluation of the effects of domestic exposure to radon based on a function q(y) for in vivo radiogenic neoplasia and on scaling atomicbomb results to radon exposure.

1987) were used as input. 33) Here zF (Ee) is the first moment of the microdosimetric spectrum. 4, along with the 38 / 4. 0 10–2 100 10–1 101 y (keV µm–1) Fig. 4. The distribution of y⌬(y) as a function of y for the free gammaray field at 1,500 m from ground zero at Hiroshima (solid line) calculated for a site diameter of 1 ␮m. , 1995). microdosimetric spectrum for 250 kVp x rays for comparison. 6 as the normalizing factor or baseline when examples are given of the implementation of this and the fluence-based approaches.

2. Charged particle tracks which branch, which produce energetic delta rays, or which curve significantly may produce two or more interactions in a single large cavity, while they would produce only one interaction in each of two or more sites in a uniform density situation. This reduces the number of small events and increases the lineal energy of some large events when a solid-walled detector is used. , 1998). The significance of these errors in measured lineal-energy spectra depends on the use to be made of the data, and in the case of calculating risk by the event-based method, on the value of the specific quality function [q(y)].

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