Answered: Q-2: If a piece of aluminum to be… | bartleby

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Q-2: If a piece of aluminum to be tested by ultrasonic probe with frequency
of 9 MHz, and the maximum beam spread angle should not exceed 10°,
what is the minimum diameter of probe disc? Use any available data to
solve problem.

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Find the approximate solid angle for a source-detector arrangement whereby a 5-cm diameterdetector is placed 30-cm from a point source which emits gammas isotropically. Formally, onewould find a solid angle by integrating sinθ dθ dφ over appropriate θ and φ limits given by thesize of the detector at the given distance from the source. However, a good approximation is touse the ratio of the detector area to the surface area of a sphere at the detector distance to findthe fraction of 4-pi which the detector covers
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