b). Compute the thickness of aluminum and lead to transmit 10% of a narrow beam of 0.1Mev gamma radiations. The numerical value of attenuation coefficient for Al and Pb are 0.435cm-1 and 59.7cm-1 respectively
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- A 70-kg researcher absorbs 4.5 × neutrons in a work day, each of energy 1.2 MeV. The relative biological effectiveness (RBE) for these neutrons is 10. What is the equivalent dosage of the radiation exposure for this researcher, in millirem?An organic sample of mass 4.00 kg absorbs 2.00 mJ via slow neutron radiation (RBE=5).What is the dose equivalent (mSv)?Q. No 04: a). Mention some necessary steps to minimize the production of bremsstrahlung during beta-ray shielding.
- ✓ ON "O 2.75 MeV 0.511 MeV 0.511 MeV B, E= 1.73 MeV Eave = 0.721 Mev O MeVLead (density 11.34 g/cm³) and concrete (density 2.4 g/cm³) are highly effective materias in radiation shielding. a) What thickness of lead in cm is required to reduce the intensity of a 0.2 MeV gamma ray beam by a factor of 1000. b) What is the thickness of concrete in cm equivalent to that thickness of lead?question 4 please
- A 75 kg person receives a whole-body radiation dose of 2.4 * 10-4 Gy, delivered by alpha particles for which the RBE factor is 12. Calculate (a) the absorbed energy in joules and the dose equivalent in (b) sieverts and (c) rem.The linear absorption coefficient for 5-MeV gamma rays in lead is 78 m-1. Find the thickness of lead required to reduce by one- fourth the intensity of beam of such gamma rays. O A. 8.9 mm O B. 17.8 mm OC. 3.7 mm OD. 1.9 mm O E. 7.4 mmTungsten 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?
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