![]() If the fluorescent yield value is high, the spectrometer sensitivity for that element will probably be high as well, and vice versa. The fluorescent yield is an important fundamental parameter, since it is one of the factors that will determine the absolute number of counts that an element will give under a certain set of experimental conditions. The ratio of the number of vacancies resulting in the production of characteristic X-ray photons to the total number of vacancies created in the excitation process is called the fluorescent yield. It has also been stated that not all vacancies result in the production of characteristic X-ray photons because of the competing Auger process involving internal rearrangement. In this expression K and s are constants that depend on the spectral series of the emission line in question. The resultant design of opacities shapes an image on the radiograph that is recognizable in the frame and can be translated. ![]() Radiopaque tissues/objects show up whiter, whereas radiolucent tissues/objects show up darker. The radiograph will show a extend of densities from white, through different shades of dim, to dark. The more prominent the sum of tissue retention, the less X-ray photons reach the film, and the whiter the image on the film. Thicker tissue/objects will assimilate more X-rays than more slender tissue of comparable composition. Tissues/objects with a better nuclear number will retain more radiation than tissues with a lower nuclear number. Retention of X-rays may be a work of the nuclear number and thickness of the tissues/objects. X-ray photons have the potential to enter tissue a portion of them are weakened by the tissue, and a portion pass through the tissue to connect with and expose the radiographic film. Vinay Kumar Pandey, in Introduction to Biomedical Instrumentation and Its Applications, 2022 Formation of radiography
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