Calculate the wavelength of a 0.652 MeV Gamma Ray
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- If a pregnant woman should be exposed to no more than 20.0 rad, and a radiation source gives 38.0 rad at 193 cm, what is the minimum distance she should stand from the radiation source?39.8 An atom of uranium-235 (atomic mass: m(23U) cays to thorium-231 (atomic mass: 231. 00 Th) = 231.03630 u) emission of an 235.04392 u) de- 92 via the a particle (nuclear 4.00151 u). m(ža) c = 2.998 x 108 m s-1. mass: Use %D (a) What is the binding energy of an 235U nucleus (in J)? 92 (b) What is the binding energy of a 231 Th nucleus (in J)? 90 (c) What is the binding energy of an a particle (in J)? (d) What is the maximum possible ki- netic energy (in J) of the a particle emitted during this decay? (Hint: what is the difference between the mass of 23°U and the total mass of 92 231 Th and an a particle?) 90 (e) Whatis the maximum velocity of the emitted a particle?If 2.50 pCi [1 pCi (picocurie) 1X10⁻¹²Ci] of radioac-tivity from ²³⁹Pu is emitted in a 95-kg human for 65 h, and eachdisintegration has an energy of 8.25X10⁻¹³ J, how many graysdoes the person receive?
- Given: Nc = (2.51x1019)(mn/mo)3/2 (T/300)3/2 Nv = (2.51x1019)(mp/mo)3/2 (T/300)3/2 and ni = (NcNv)1/2 e(-Eg/2kT) show that: ni = (2.51x1019) ((mn/mo) * (mp/mo) )3/2 e(-Eg/2kT)1Compare the wavelength of 1.0-MeV gamma-ray photon with that of a neutron having the same kinetic energy. (for a neutron, mc² = 939 MeV)