1] Define the 3 different radiations
by radioactive nuclei. Include a
Answer: Alpha, Beta, Gamma ; see text for descriptions!
5] The atomic mass of the isotope 105B is 10.012938 u (this includes the electrons, donít forget them). What is the binding energy per nucleon for this isotope?
Answer: 6.475 MeV/nucleon
1] A possible step in the fusion reactions for the Sun has a hydrogen nucleus (1.00728 u) fusing with a 7Be nucleus ( 7.01470 u ) to form a Boron nucleus ( 8B, 8.02186 u ) with the emission of a gamma ray. Write out the nuclear reaction equation for this process and determine the maximum energy (in MeV) of that gamma ray?
11H + 74Be ------- 85B + 00gamma
1. The advantage of a fusion reactor when compared to a fission reactor is which of the following?
A. the fuel is cheaper
B. there would be much less radioactive waste material
C. it takes less energy to cause fusion than it does
D. both choice A and B are valid
2. Which particle below is the least stable (ie. can decay ) over time?
3. Uranium-238 decays into the element Thorium-234. Which of the following must be emitted in this one decay process?
A. gamma ray
B. beta particle
C. alpha particle
4. Approximately how many half-life periods would have to elapse if the activity of a radioactive isotope sample is to be reduced to 1/60 of its original value?