If the thickness needed by a certain medium to reduce the intensity of incident x-rays by 40% is 150 cm, what is the attenuation coefficient of the medium?
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- If the thickness needed by a certain medium to reduce the intensity of incident x-rays by 40% is 150 cm, what is the attenuation coefficient of the medium?
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- Calculate the interplanar spacing (in picometers) that corresponds to diffracted beams of X-rays at θ = 27.4o, if the X-rays have a wavelength of 141 pm. Assume n = 1.A light beam of wavelength λ= 500 nm, beam diameter 5 mm and intensity I is propagating in a medium. The absorption cross section of the medium is 2.3×10-19 cm-2 and upper-level lifetime is 10 µs. Calculate the power of the light beam that make the absorption coefficient of the medium (α) decays to 50% of its initial value (αo).Although electron microscopy is the preferred technique for measuring high resolution scientific images, scanning probe microscopy can utilize the smallness of wavelengths to create an image of particles not visible through regular microscopes. In general, the wavelength of the scanning light must be at least as small as the item being scanned in order to detect the presence of the item. The new novel coronavirus has a size of 60 nm to 140 nm, with an average size of 125 nm. Red blood cell Particles ihered Coronavinu by masks Bacillus Bacteria PM2.5 0.007um 0.1um 0.5pm 2.5um 7um 10um #seetheair Part A Which scanning light sources could detect a single coronavirus? (select all that apply) O ultra-violet microscopy O x-ray microscopy O a regular (visible light) microscope O infrared spectroscopy
- Ordinary X-ray photographs cannot produce sharp images of internal organs whose densities are not varying significantly from their surroundings. What technique overcomes this problem?In relation to x-ray imaging, which of the following statements is true? Choose one answer. a. The linear attenuation coefficient of a material is directly proportional to its half value thickness. b. For clinically useful x-rays, lead has a greater half value thickness than soft tissue. c. The intensity of an x-ray beam decreases exponentially as it passes through tissue. d. The intensity of an x-ray beam increases exponentially as it passes through tissue. e. Good contrast media are generally poor absorbers of X-rays. and Why??