X-rays having various energies, Eo penetrated water that was 10 cm deep. energy

Question

X-rays having various energies, Eo penetrated water that was 10 cm deep. energy was absorbed by the water and some was transmitted. Some šXp.raty In Figure 1 the unshaded portion and the scale at the left give, for each Eo, the percent of Eo that was absorbed through each of Mechanisms A, B, C, and D (described in Table 1). In Figure 1 the shaded portion and the scale at the right give, for each Eo, the percent of Eo that was transmit- ted. The percent of Eo that was absorbed through a given mechanism or that was transmitted equals the height, in percent, of the respective sector (see the example for 0.2 MeV: 1 MeV= 1 million electron volts). 100 Mechanism C 90 - 80 Mechanism Mechanism B 10 30 40Transmitted 50 50 Mechanism Example for Eo 0.2 Me V: 2% of E0 was absorbed through Mechanism A, 80t 90. / 100+ -18% through Mechanism B. and -20 | | 48% through Mechanism. D. 32 % of Eo was transmitted. 10 Eo (MeV) Figure 1 Figure adapted from Herbert L. Anderson, ed., Physics Vade Mecum, 1st ed. 01981 by The American Institute of Physics panuusuan of Jouauad 987 -a, 8| poposare "a jo uauad

Explanation / Answer

(40) As we seen from the graph that at the Eo = 0.8 Mev the mechanism C and D are very away from the
zero percent of absorption therefore
Only A and B are the mechanisms for which the percent of absorption can be zero.

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