5. You figure the Radiation intensity without shielding is 78 mSv/h for a fellow CEDO's radiographic exposure, and behind a close by shield you figure the intensity is 3mSv/h. If the HVL of shielding material is 4 mm, what thickness is that shield?
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- Calculate the effective radiation dosage (in Sieverts) for a 81-kg person who is exposed to 1.9 x 109 particles of alpha radiation. Assume that 79% of the radiation is absorbed, each alpha particle has an energy of 6.2 x 10-13 J, and that the RBE of the alpha particles is 15. Note that RBE is sometimes called the quality factor, abbreviated as Q.Tungsten has a linear attenuation coefficient of 30.5/cm for gamma rays with 150 keV of energy. If an unshielded Tc-99m syringe has a radiation exposure rate (I(0)) of 34 mR/hr, what will be the exposure rate if a 0.25-cm tungsten shield is placed around it? Using the calculation above, how much (what percent) is transmitted through the shield? What percent is attenuated?What is the proper minimum required radiation protection for gamma radiation?
- Since the atmosphere shields us from the cosmic rays, the higher we go in our atmosphere, the more radiation we are subject to. Therefore the amount of instantaneous radiation is larger when travelling on an airplane, compared to staying on the Earth's ground. For example, a long-distance airplane flying at cruising altitude exposes each passanger to an extra dose of radiation of about 5 μµSv per hour. Now, assume that, for anyone who is not taking any flights, the natural background exposure in a year is 3 mSv, and assume also that there are no other significant sources of radiation. Part A After how many hours of flying would a person double her or his yearly radiation dose? Express your answer in hours. ΨΕΙ ΑΣΦ t = Submit Request Answer ? hThe intensity of radiation from. a radioactive source is 900mR at a distance of 20meters. At what distance willtheintensity of radiation be at 6.25mR