American Society for Nondestructive Testing (ASNT) Radiographic Testing Practice Test

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Increasing which factor could potentially reduce the clarity of a radiograph?

Film quality

Source-to-specimen distance

Source size

Increasing the source size can lead to a reduction in the clarity of a radiograph due to the effects of penumbra. Penumbra refers to the blurred edge that occurs at the periphery of an image when the source of radiation is not a point source but rather has a certain size. A larger source size will produce more pronounced penumbral effects, resulting in a less defined image. This is because the radiation reaching the film from different points on a larger source will diverge more significantly, causing a loss of sharpness and detail in the radiographic image.

Maintaining a smaller source size is crucial for achieving optimal image resolution. In contrast, factors such as film quality, source-to-specimen distance, and exposure time can affect the overall exposure and quality of the image, but increasing source size specifically contributes to a decrease in clarity due to the diffusion of radiation.

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Exposure time

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