The linear absorption coefficients for 0.05-nm x-rays in lead and in iron are, respectively, 5.8 × 10* m¯' and 1.1 x 10* m-. How thick should an iron shield be in order to pro- vide the same protection from these x-rays as 10 mm of lead?
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- The x-ray linear attenuation coefficient of water at 40 keV is ?????? = 0.27 ??−1.The CT number of a tumor reported by a CT scanner is 60 HU. Calculate the linear attenuation coefficient of the tumor tissue ?5 6 À (x10-² nm) 7 8 9 10 Relative intensity Mo 9 9 12 vith → To 15.2 → To 37.2V Smugglers. Rumor has it that a company has been smuggling gold out of the country using sealed, cylindrical barrels with hollow walls. They pour molten gold into the hollows, and then fill the remainder of the barrel's internal volume with packing peanuts. The total mass of the gold-walled barrel was designed so that it exactly matches those used to transport a volatile chemical that cannot be exposed to air (and therefore the barrel cannot be opened and checked). The X-ray machine usually used to screen containers is suspiciously damaged and not available. esc (a) There are 20 barrels total, and they are all identical: mass m = 50.0 kg, height h = 1.2 m, and diameter D = 0.25 m. How do you determine which ones have walls filled with gold (and are essentially hollow on the interior except for packing peanuts) and those completely filled with the volatile chemical (a tightly-packed powder) where the mass is uniformly distributed? Hint: apply the concepts of moment of inertia. Is the…
- The observed fluorescence lifetime in the absence of a quencher is 1.4 ns. In the presence of a quencher the fluorescence lifetime is 0.8 ns. Calculate the quenching efficiency. which is the ratio of the f luorescence quantum yieldsin the presence and absence of the quencher. φF/φF,0.When we illuminate lead with ultraviolet light with a wavelength of 250 nm, suppose we find the maximum potential difference developed between the plates in the experimental setup shown in the figure to be 0.82 volts. From these data and the accepted value of hc, find the potential difference between the plates if the wavelength is 215 nm. Also find W for lead.