What is the initial intensity, l, of the 5 g Co source at a distance of 1m if gamma rays emitted by 60Co have an average energy of 1.9 x 10-1³ J?
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- The point source Co-60 emits gamma with energies of 1.17 MeV and 1.33 MeV. Each of these energies emits the same number of photon particles. At a certain location, the flux that is read is 5.7 x 109 photons/cm2.s, what is the intensity or energy flux with units of J/m^2.minA 53.0 kgkg laboratory worker is exposed to 26.0 mJmJ of beta radiation with RBE = 1.5. What is the dose equivalent in mremmrem?A passenger on an airplane flying across the Atlantic receives an extra radiation dose of about 5μSv per hour from cosmic rays. How many hours of flying would it take in one year for a person to double his or her yearly radiation dose? Assume there are no other significant radiation sources besides natural background.
- 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)?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.A chest x ray uses 10 keV photons. A 60 kg person receives a 30 mrem dose from one x ray that exposes 25% of the patient’s body. How many x-ray photons are absorbed in the patient’s body?
- question 4 pleaseWhat experimental parameters help protect those who work regularly with radioactive materials and why? Radioactive decay is an inherently random process. In order to make our radiation counting measurements better, what could you do to increase the precision of your measurements? If the radioactive samples are not brand new, then how does the relative age of the sample affect your measurements?41.3 70% of the radiation from a gamma emmitter is blocked by 1 cm of steel shielding. How many 1 cm thick steel shielding plates are required to block: (a) at least 90% of the radiation from the source? (b) at least 99% of the radiation from the source?
- help pleaseb). 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 respectivelyThe 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 mm