# Test 2 Physics (odd)

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 Author: RadiationTherapy ID: 263717 Filename: Test 2 Physics (odd) Updated: 2014-03-02 11:33:12 Tags: radiation therapy Folders: Mosbys Description: chapter 3 physics Show Answers:

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1. What are the differences between electrons and protons
• Electrons are light, negatively charged particles that collide and interact with other particles.
• Protons are heavy, positive charge particles that only interact with electrons.
2. During xray production, the resulting xray beam comes from electrons colliding with the target causing interactions such as
• Auger electrons
3. The positive side of the basic x-ray tube is know as the _______
Anode
4. The ratio of xray to heat during xray production is variable depending on the __________ of electrons transversing the tube.
Maximum energy
5. An _________ collision is one in which the incoming electron gives all of its energy to the electrons it encounters.
Elastic
6. Name the photon interactions
• photon disentintegration
• coherent scattering
• photelectric effect
• compton effect
• pair production
7. Name the electron interactions
• bremsstrahlung
• characteristics
8. Regarding isotopes, isotopes are an element that have the same # of ____ but a different # of neutrons
protons
9. Match these
___isotopes___isobars___isotones___isomerA. IR192m IR192m
B. 27Fe59, 27Fe58
C. 28NI60, 31Ga60
D. 11Na22, 10Ne21
• A. isomer
• B. isotope
• C. isobar
• D. isotone
10. If using a tungsten target, the fx of 4 MeV electrons converted to photons is
• .1036 or 10.36%
• F=3.5X10^-4(74)(4MeV)
• F=.1036
11. The probability of photoelectric interaction_______ with increasing energy and ________ with the atomic # of the medium.
• decreases
• increases
12. A neutral atom that loses an electron by ionization is called a
positive ion
13. A certain atom has binding energies of 70eV in the L shell and 10eV in the M shell. During an M shell to L shell transition, the photon emitted will have the energy of ____
60ev
14. An atom is neutral if the # of its electron is = to its
protons
15. The photons produced during the orbital transitions of electrons from a higher to lower energy are called
16. 2 or more chemicals with the same chemical formula, but having difference nuclear states are known as
isomers
17. How many disintegration per min are there in 1 Ci?
3.7 X 1010 dpm
18. On Jan 1, we receive 80 mCi of an isotpe with a 1/2 life of 8 days. The activity remaining on Jan 25 would be
• 10 mCi
• A=80(.5)^(24/8)=
• A=80 (.5)^3)
• A=80 (.125)
• A=10
19. The wavelength of xrays are measured in
angstroms
20. The photoelectric process is essentially an interaction between a photon and a ______ electron
bound
21. A deutron is the nucleus of an isotope of H2. Which of the following is true?
A. it has a mass # of 2
B.it has an atomic # of 2
C. it has a positive charge of 2
D. is has an energy of 2 MeV
A
22. The probability that a photon interacts with a material is _____ to the attenuation coefficient
proportional
23. Out of Alpha, Beta, Proton and Neutrons, which is produced during natural radioactive decay
Alpha
24. Out of Alpha, Beta, Proton and Neutrons, which can carry a + or - charge
Beta
25. Out of Alpha, Beta, Proton and Neutrons, which has helium nucleus
Alpha
26. Out of Alpha, Beta, Proton and Neutrons, which has hydrogen nucleus
Proton
27. Out of Alpha, Beta, Proton and Neutrons, which has greatest internal hazard
Alpha
28. Out of Alpha, Beta, Proton and Neutrons, which cannot ionize directly and interacts with only the nucleus
neutron
29. Out of Alpha, Beta, Proton and Neutrons, which may be referred to as an electron or positron
beta
30. Out of Q- Quantity, H-quality, and B for both, which is affected by altering time of exposure
Quantity
31. Out of Q- Quantity, H-quality, and B for both, which is affected by altering tube current
Quantity
32. Out of Q- Quantity, H-quality, and B for both, which is affected by altering target material
Quality
33. Out of Quantity, quality, or both, which is affected by altering distance
Both Q/B
34. Out of Q- Quantity, H-quality, and B for both, which is affected by altering filtration
Both H/B
35. Out of Q- Quantity, H-quality, and B for both, which is affected by altering kVp
Quality
36. Out of Q- Quantity, H-quality, and B for both, which is affected by altering generator type
Both
37. I131 and I125 have different #s of
neutrons
38. Neutron decay ______ (is/is not) a type of nuclear decay.
is not
Decay constant
40. The energy of an electromagnetic radiation is _________ proportional to its wavelength.
Inversely

energy <inversely> wavelength
41. The energy of an electromagnetic radiation is _________ proportional to its frequency.
Directly

energy<directly>frequency
42. Cobalt 60 decays by ______.
Beta minus
43. To interact by photoelectric effect, the interacting photon must have energy equal or greater than the :
Binding energy of the orbiting electron
44. Carbon 14 and Nitrogen 14 are:
• Isobars
• (same mass)
45. When a long-lived radionuclide decays to a short-lived daughter, it is known as ________ equilibrium.
Secular
46. ________ implies the removal of an electron from the atom.
Ionization