By James Wood (Auth.)
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Extra info for Computational Methods in Reactor Shielding
Because the units of flux and current are the same (cm -2 s _ 1 ) , there is sometimes confusion in distinguishing between the two quantities; the following example (after Schaeffer (1973) . 37) brings out the difference nicely. 4. (i) A plane source Sj emits monodirectional and monoenergetic particles at the rate of 10 1 0 particle cm - 2 s _ 1 in a direction normal to the surface. A dia gram of the arrangement is shown in Fig. 14. Calculate the current density and flux density: a) at a point in a plane A whose normal n^ is parallel to that of Sj b) at a point in a plane B whose normal ivg is at an angle 6 with respect to IIA« (ii) Suppose that a second plane source, S 2 , is added (also shown in Fig.
12, namely, MONTERAY, computes amongst other things, albedo values for gamma rays incident upon slabs of material. It is therefore pertinent to establish beforehand the basic definitions of the albedo quantities evaluated by this program. As we shall see, the concept of albedo relies heavily on the idea of particle current, and therefore the work of this section follows on, in a natural way, from the ideas introduced in the previous section. It is perhaps worth offering, at the outset, a word of warning in connection with the use of the term albedo in shielding literature.
This is the conversion curve for gamma rays recommended by the ICRP in Publication 21 (1971). is shown again in Fig. 5, along with a similar curve, also obtained from eq. 18) but using u tr (E)/p data for air. It is clear from Fig. 5 that the response func tions for gamma rays in air or tissue are very similar (this is also the case if ua(E)/p data is used instead for both materials). Of course the curves obtained from eq. 18) that are shown in Figs. 5, were derived without allowing for the perturbing effect of the presence of the human body.
Computational Methods in Reactor Shielding by James Wood (Auth.)