Deck 14: Introduction to Radiation Therapy Physics

Question 1

AMU is an abbreviation for:

A) atomic metric unit
B) atomic measured unit
C) american metric unit
D) atomic mass unit

Answer 1

D
The abbreviation for atomic mass unit is AMU.

Question 2

When some energy is imparted to the electrons of the atom,they will move to higher energy empty states.This process is called:

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

Answer 2

B
Excitation takes place when some energy is imparted to the electrons of the atom,causing the electrons to move to higher-energy states,called excited states,and the atom will then reach an unstable state.

Question 3

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

Answer 3

A
The process described is ionization.

Question 4

Wavelength is represented by:

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

Question 5

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

Question 6

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 7

Who proposed the first model of the atom?

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

Question 8

One Curie (1Ci)equals:

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

Question 9

A radioactive sample is measured to contain 1000 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 10

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 11

The speed of light is:

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

Question 12

The metric system,or SI,unit of energy is:

A) Hertz
B) meter
C) Joule
D) Angstrom

Question 13

A mCi (millicurie)equals:

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

Question 14

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
D) intensity coefficient

Question 15

The unit for frequency is 1/sec,called the:

A) Lambda
B) Hertz
C) meter
D) Angstrom

Question 16

Nuclear binding energy is measured in:

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

Question 17

The force responsible for interaction between particles with nonzero mass and having infinite range is:

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

Question 18

The most common photon interaction that occurs in the energy range used in radiation therapy is:

A) photoelectric
B) Compton
C) photodisintegration
D) Thomson

Question 19

A condition where 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 20

How many seconds in 3 hours and 20 seconds?

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

Question 21

X-rays are photons produced by the interaction of electrons with any material.

Question 22

The number of protons and neutrons within the nucleus defines the physical and chemical properties of the atom.

Question 23

Ground state is the minimum amount of energy needed to keep the nucleons together.

Question 24

Rest mass refers to the mass (weight)of a particle when it is not moving.

Question 25

There are three major quantities that are important in radiation physics.They are radiation exposure,radiation absorbed dose,and radiation dose equivalent.

Question 26

The smallest unit of an element that retains the properties of that element is known as a molecule.

Question 27

The electron Volt can be related to the Joule.

Question 28

A photon is any "packet" of energy traveling through space at the speed of sound.

Question 29

Radioactive decay will always result in an increase in the amount of radioactivity present.

Question 30

The coulomb is the metric unit of electrical mass.

Question 31

There are four photon interaction processes that occur in the energy range of concern in radiation therapy.

Question 32

A beta minus particle is the same as a helium atom.

Question 33

Ground state is the lowest energy state for an atom.

Question 34

Half-life is the time required for the activity of any sample of a radioisotope to decay to half of its initial value.

Question 35

Intensity is less at 100 cm from a source of radiation than it is at 80 cm from the same source.

Question 36

Radiation can be considered both as waves and particles.