The typical free path of alpha-particle from ionizing radiation in human body is
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The typical free path of alpha-particle from ionizing radiation in human body is
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- Explain why for beta ray shielding, usually two shields rather than one single shield are used.In 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?c. Starting from the formula for the magnetic force experienced by a particle in a magnetic field, derive the for the diameter of the circular path followed by the formula r = for the radius, and hence D = mv 2eB alpha particle above. mv eB
- What is the proper minimum required radiation protection for gamma radiation?most dangerous?Alpha particles with energy 4.25 MeV interact with gas molecules in ion – chamber and produced 300 particles /second. If the particles lose all its energy in the ion – chamber, the ionization energy is 35 eV, what is the current produced by these particles? Find the resistance that must be connected in series with the ion chamber for the voltage difference to be 0.1 and 1 V?