If all of the ion pairs are collected in the last example, what is the current?

Question

If all of the ion pairs are collected in the last example, what is the current?

This is the last example from the book.

Example Calculate the first-collision dose to tissue hydrogen per unit fluence of 5-MeV neu trons. Solution The density of H atoms is N= 5.98 × 1022 cm-3 (Table 12.3) and the cross section for scattering 5-MeV neutrons is = 1.61 × 10-24 cm2 (Fig. 9.2). The mean energy loss per collision, Qing-2.5 MeV, is one-half the incident neutron energy. The dose per unit neutron fluence from collisions with hydrogen is therefore (tissue density = 1 gcm-3) 5.98 x 1022 cm"3 x 1.61 × 10-24 cm 2 × 2.5 MeV 1 gcm-3 NoQwg D= 1.6 × 10-13 J MeV-1 10-3 k851 = 3.85 × 10-11 Gy cm 2. (12.31)

Explanation / Answer

The current is formed by the out going ions

Here Q=n*e=5.98*1022*1.6*10-19

=9.56*103C

I=Q/t=9.56 *103C/s

=9.56kA

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