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## Download Applied Physics of External Radiation Exposure: Dosimetry by Rodolphe Antoni, Laurent Bourgois PDF

Posted On April 11, 2017 at 4:49 pm by / Comments Off on Download Applied Physics of External Radiation Exposure: Dosimetry by Rodolphe Antoni, Laurent Bourgois PDF

By Rodolphe Antoni, Laurent Bourgois

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Extra resources for Applied Physics of External Radiation Exposure: Dosimetry and Radiation Protection

Example text

By taking up the case of the previous two spheres and a number of particles N, we get the following fluence of particles: U1 ¼ N 4p r12 and U2 ¼ N 4p r22 We can spontaneously notice the following property: U1 ¼ U2  2 r2 : r1 and yet that:  2 r2 U2 U1 ¼ r1 So it is possible to spontaneously get a fluence of particles at any distance from the source, if you know the value of the fluence at another distance. 58). 3 Radiometric Quantities 33 Note, ﬁnally, that this law is necessarily valid for the ratio of particle fluence rates:  2 d2 U_ 1 ¼ _U2 d1 To illustrate concretely some of the variables described below, apply these concepts to simple cases.

1 gives to alphas and protons path in water (to which soft tissue can be assimilated) to 1, 10 and 100 MeV. Note that later in this chapter, tissues are frequently treated as water, due to a medium Z and a similar density. 2 shows a numerical simulation using the Monte Carlo code for 1 MeV Electron transport in water [2]. Several informations can be learned: as observed in Fig. 1 the path beginning is rather straight and slightly accompanied by ionization, whereas at the end of trajectory there has been an erratic path with many collisions accompanied by strong deflections.

Beyond, the passage of a single path expends more energy than necessary to kill the cell, there is a “waste of energy” and in fact decrease the RBE since the deﬁnition is the ratio of doses required to produce a given effect. Furthermore, with a massive energy deposition over a short distance, the following cells will be made more “spared” at equal dose than in the case of particles with lower LET; we speak of an “energy cluster” effect. 13 adds to this RBE microdosimetric curves, spectra of three types of particles: gamma, protons and neutrons.