| SCI 270: On Nuclear Technology Practice Problems |
Answers are given for your reference only. Please do your part of
the learning, because no one else will be able to do that for you.
Your skills of problem solving are tested and useful in the future. Answers are useless. Acquiring skills and abilities are the goals of learning, marks indications of your performances on these tasks.
Note the relationship between the overall decay constant and the partial decay constant:
|Mass of 64Cu29|
|Cu ® b- + 64Zn||0.58||40||_32.3_ h||_63.9297_amu|
|Cu ® b+ + 64Ni||0.66||19||_67.9_ h||_63.9398_amu|
|Cu + e- ® 64Ni||no data||41||_31.5_ h||not a blank|
|Comment on the two masses of Cu so evaluated:|
These masses are within experimental error. There are many sources of errors in these measurements. The decay energis may have errors.
How much energy is required or released in this conversion?
|Mass of proton||Mass of neutron||Amount of energy|
or 938.259 MeV
or 939.5527 MeV
How can the energy be supplied or removed in this process?
|Brief comment please:|
The energy can be supplied in the form of kinetic energy. Protons and antiprotons with total kinetic energy equal or greater than 2.587 MeV (or 1.294 MeV each) will be sufficient theoretically.
What is the total decay rate in Bq immediately after they were purified? Ignore the radioactive decay products of the two nuclides.
|The decay rate is:|
|__decay rate of U-235 = 5629__ Bq __|
|__decay rate of U-238 = 11450__ Bq __|
|__Total decay rate = 17079__Bq __|