Deck 13: Introduction to Radiation Therapy Physics

Question 1

8)The number of protons and neutrons in the nucleus is known as _______________.

A) atomic weight
B) strong force
C) atomic mass number
D) nuclear stability

Answer 1

C
The number of protons and neutrons in the nucleus is termed the atomic mass number.

Question 2

2)How many seconds are there in 3 hours and 20 seconds?

A) 200
B) 10,800
C) 10,820
D) 1082

Answer 2

C
3 hours ´ (60 minutes/1 hour)´ (60 seconds/1 minute)+ 20 seconds = 10,820 seconds.

Question 3

10)Nuclear binding energy is measured in which of the following?

A) keV
B) Amu
C) MeV
D) Coulombs

Answer 3

C
Nuclear binding energy is measured in MeV, or mega-electron volts.

Question 4

3)The force responsible for interaction between particles with a nonzero mass and having infinite range is _________________.

A) electromagnetic
B) gravity
C) weak force
D) strong force

Question 5

6)If sufficient energy is given to the atom, one or more electrons of the atom can overcome their binding energy and can be completely removed from the atom.This process is called __________________.

A) ionization
B) excitation
C) nuclear force
D) frequency

Question 6

9)Which statement is not true?

A) The nucleus of the atom consists of protons and neutrons.
B) Protons and photons are collectively called nucleons.
C) Protons are positively charged particles.
D) Neutrons are neutral with no electric charge.

Question 7

7)When some energy is imparted to the electrons of the atom, they will move to higher energy empty states.This process is called which of the following?

A) Ionization
B) Excitation
C) Nuclear force
D) Frequency

Question 8

15)One curie (1Ci)equals which of the following?

A) 3.8 ´ 108 dis/sec
B) 3.7 ´ 108 dis/sec
C) 3.7 ´ 1010 dis/sec
D) 3.8 ´ 1010 dis/sec

Question 9

1)AMU is an abbreviation for which of the following?

A) Atomic metric unit
B) Atomic measured unit
C) American metric unit
D) Atomic mass unit

Question 10

5)An electron's binding energy is the amount of energy required to remove that electron from the atom and is usually measured in __________.

A) MeV
B) keV
C) Coulombs
D) kilograms

Question 11

4)Who proposed the first model of the atom?

A) Bohr
B) Thomson
C) Rutherford
D) Planck

Question 12

13)Wavelength is represented by ______________.

A) lambda
B) Hertz
C) inch
D) second

Question 13

14)The metric system, or SI, unit of energy is ________________.

A) Hertz
B) meter
C) joule
D) angstrom

Question 14

20)Which of the following is the most common photon interaction that occurs in the energy range used in radiation therapy?

A) Photoelectric
B) Compton
C) Photodisintegration
D) Thomson

Question 15

17)A radioactive sample is measured to contain 1,000 mCi of radioactivity.If the decay constant of this isotope is 0.105 hr?¹, how much activity will remain after 48 hours?

A) 6.474 mCi
B) 7.368 mCi
C) 0.154 mCi
D) 15.445 mCi

Question 16

12)The unit for frequency is 1/sec, called the _________________.

A) lambda
B) Hertz
C) meter
D) angstrom

Question 17

18)The condition in which the half-life of the parent isotope is much greater than the half-life of the daughter isotope is called __________________.

A) transient equilibrium
B) transient attenuation
C) secular attenuation
D) secular equilibrium

Question 18

16)A mCi (millicurie)equals which of the following?

A) 103 Ci
B) 10-3 Ci
C) 10-6 Ci
D) 106 Ci

Question 19

11)The speed of light is _______________.

A) 3 ´ 1010 m/sec
B) 3 ´ 108 m/min
C) 3 ´ 1010 m/min
D) 3 ´ 108 m/sec

Question 20

19)The thickness of some added material required to reduce beam intensity to half its original value is called the __________________.

A) half-life
B) inverse square factor
C) half-value layer (HVL)
D) intensity coefficient

Question 21

23)Rest mass refers to the _______ of a particle when it is not moving.

A) energy
B) charge
C) force
D) weight

Question 22

25)A beta minus particle is also known as a(n)____________.

A) electron
B) proton
C) hadron
D) neutron

Question 23

22)There are four major quantities that are important in radiation physics.They are radiation exposure, radiation absorbed dose, radiation dose equivalent, and ________________.

A) radioactivity
B) magnetism
C) electromagnetism
D) frequency

Question 24

21)The smallest unit of an element that retains the properties of that element is known as a(n)_________________.

A) molecule
B) quark
C) hadron
D) atom

Question 25

24)The coulomb is the metric unit of electrical ______________.

A) mass
B) charge
C) energy
D) frequency