24.1e Ex1 ON15 P43 Q11 Intensity Ratio Contrast | A2 Medical Physics | CAIE A Level Physics

Описание: Example 1 - 9702/43/O/N/15: An X-ray source is placed on one side of a metal plate, as shown in Fig. 11.1. The intensity of the X-ray beam is measured at points A and B.
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(a) State two reasons, other than absorption of X-ray photons in the metal, for the intensity at point A to be different to that at point B.

(b) A specimen of muscle and bone undergoes X-ray examination. Parallel beams of X-rays are incident on the specimen, as shown in Fig. 11.2. The specimen has a total thickness of 4.0 cm. One section contains a bone of thickness 1.5 cm. Data for the linear absorption (attenuation) coefficient μ for the bone and for the muscle in the specimen are given in Fig. 11.3

(i) Calculate the ratio of intensity of X-ray beam incident on the specimen over intensity of X-ray beam emerging from the specimen for the beam passing through the 4.0 cm thickness of muscle alone, and the bone and the muscle.

(ii) Using your answers in (i), suggest and explain whether an X-ray image of this specimen is likely to have good contrast.

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