New PDF release: Fluence-Based and Microdosimetric Event-Based Methods for

By National Council on Radiation Protection and Measurements

ISBN-10: 0929600703

ISBN-13: 9780929600703

ISBN-10: 1429498919

ISBN-13: 9781429498913

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Read Online or Download Fluence-Based and Microdosimetric Event-Based Methods for Radiation Protection in Space (Ncrp Report, No. 137) PDF

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

Example text

By using a function q(y), one effectively makes up for this lack of biological information with the aid of information on the microdosimetry of the fields of interest. Accepting the assumption that there is one unique function of linear energy that describes risk reduces the amount of biological data required. 1 to 1,000 keV ␮m‫מ‬1) might be sufficient. Clearly, the accuracy in the determination of q(y) depends on the number of data sets available, as has been discussed in detail by Zaider and Brenner (1985).

However, these detectors will also have a response for directly-ionizing particles such as protons. D. (2000). Personal communication (National Aeronautics and Space Administration, Johnson Space Center, Houston). 46 / 5. PRACTICAL ASPECTS OF RADIATION MEASUREMENTS principle, the directly-ionizing spectrum can be measured separately and its contribution to the spectrum measured by the recoil detector can be subtracted, but this process is subject to large errors due to limited statistics and the poor resolution of most detectors.

The selection of z as physical descriptor means that there must be an effect function [␧ (z)] that describes the biological damage for a given system, endpoint and site size. , kind) of radiation, it follows that all radiations in this case will have the same effectiveness per unit dose; therefore, RBE will be unity for all of them. 16 are incorrect. Assuming then some (nonlinear) function ␧ (z), the distribution f (z) is needed to find ␧. , not escaping as delta radiation). The conditions under which LET is a reasonable substitute for lineal energy (y) can now be stated explicitly: the distributions f (y) or f (z) must be dominated by fluctuations of the Type 1, 2, and 3 and not by 4 and 5.

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Fluence-Based and Microdosimetric Event-Based Methods for Radiation Protection in Space (Ncrp Report, No. 137) by National Council on Radiation Protection and Measurements


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