d). A nuclear physicist works in a lab 5 days per week. He set his timing from 9AM to 3PM in first three days. It is known that he experienced a radiation field 15mR/hr there. Estimate the total daily exposure of radiations.
Q: D. 0.00 MIN A. 0.6 mR/hr B. 3 mR/hr C. 75 mR/hr D. 375 mR/hr 2. If the exposure rate at 10 m from a…
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Q: The intensity of radiation at 2m was 300 mR/hr. What would the exposure be at 4m? Oa. 1200 mR/hr Ob.…
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Q: 29. A shielded vial with a 0.1-mm thick lead shield contains 1. This shielded sample yields an…
A: 29 Given: The thickness of the lead is t=0.1 mm. The exposure rate with a shield at a distance of 3…
Q: A(n) 5-kg article has energy 80,020 kg c2 Calculate gamma (y).
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Q: 5. You figure the Radiation intensity without shielding is 78 mSv/h for a fellow CEDO's radiographic…
A: Concept used: HVL (half value layer) is the thickness at which value of intensity becomes 50% of its…
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Q: Radiation therapy departments use Cs-137 isotope for cancer treatment. The room walls have concrete…
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Q: Smugglers. Rumor has it that a company has been smuggling gold out of the country using sealed,…
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Q: 250 mA and .2 sec creates a good radiograph of a lateral thoracic spine with appropriate exposure to…
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Q: Smugglers. Rumor has it that a company has been smuggling gold out of the country using sealed,…
A: Given: Specifications of cylindrical barrels: mass(m) = 50.0 kg height(h) = 1.2m Diameter(D) =0.25m…
Q: A radioisotope produces an intensity of 7.52 x 10^4 becquerel (Bq) at a distance of 1.00 cm from the…
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Q: 2. Consider two gamma radioactive sources: S1 has activity 50 uCi (micro-Curie) and S2 has activity…
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Q: 5. The capture cross section ơ̟ of >ºCo for thermal neutrons is 37 b. (а) 5°CO (p = 8.9 x 10° kg.m3)…
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Q: The intensity of radioactivity depends on the distance of the recipient from the source of radiation…
A: Given that Intensity is inversely proportional to the distance from the object. so I1 DIRECTLY…
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A: In positron emission tomography, two oppositely directed gamma rays produces a positron and…
Q: The point source Co-60 emits gamma with energies of 1.17 MeV and 1.33 MeV. Each of these energies…
A: Energy of gamma rays = 1.17 Mev and 1.33Mev At Both energy same number of photon emitted Flux…
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- A 0.025 nm X-ray source deposits 30 million photons into 10 grams of tissue. What is the absorbed dose in the tissue (in Gy)? What is the dose equivalent (in Sv)?The SI unit of radiation dose is "gray" (Gy) which is radiation equivalent to 1 J/kg. A small energy delivered as ionizing radiation can create huge damage at the cellular level, and the sievert is a unit of the health effect of radiation proportional to the radiation dose, but multiplied by factors allowing for the absorption and the nature of the radiation. Which of these statements are true? You may need to research these answers, but they are useful to know. The background radiation flying in a commercial aircraft is about 10x the average natural background at the surface of Earth. A dose of 4 to 5 sieverts will kill a human with a 50% probability within 30 days if the dose is received over a short period (say accidental exposure). The dosage from a dental X-ray is about 1 milli-sievert. NASA astronauts are allowed to receive a dose of 1 sievert during their career. The background 50 km from the site after a nuclear weapons…3. A GM counter has dead time of 250 s. It records 20,000 counts per minute. What is the actual count rate? [Ans. 21,820]
- 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. TUL (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 intensity of radiation at 10 ft was 200 R/hr. If the technologist moved to 5 ft from the source of radiation, what would the exposure be? O a. 400 R/hr Ob. 800 R/hr Oc. 100 R/hr Od, 50 R/hrIn proton beam therapy, a beam of high-energy protons is used to deliver radiation to a tumor, killing its cancerous cells. In one session, the radiologist calls for a dose of 4.9 x 108 protons to be delivered at a beam current of 120 nA. How long should the beam be turned on to deliver this dose?
- 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?most dangerous?