NMTCB CT Board
Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. Internal conversion - Correct Answer: When energy from a nuclear
transition results in the emission of an orbital electron rather than a gamma
ray.
2. Internal conversion electron effect - Correct Answer: Increases the
radiation dose to the patient because energy from the electron is absorbed
into the patient's body.
3. Auger electron - Correct Answer: An orbital electron emitted when
energy from an orbital transition results in the emission of an orbital
electron rather than an x-ray.
4. Metastable - Correct Answer: When an isomeric state is long lived.
5. Characteristic of x-ray radiation - Correct Answer: The energy released
by outer shell electrons moving to now unoccupied, less energetic inner
orbitals after an electron is ejected from an inner shell orbital.
,6. Methods to create radioactive materials - Correct Answer: Radioactive
materials are produced by bombarding a target material with either ions or
with neutrons.
7. Nuclear reactor - Correct Answer: What is used to bombard elements
with neutrons.
8. Accelerator - Correct Answer: What is used to bombard elements with
protons.
9. Cyclotron produced radionuclides - Correct Answer: In-111, I-123, Ga-
67, F-18, and Tl-201.
10.Carrier-free radioisotope - Correct Answer: A radioisotope that does not
contain any nonradioactive species.
11.Activity - Correct Answer: The rate of disintegration of a radionuclide.
12.Curie - Correct Answer: The unit of activity equivalent to 3.7 x 10^10
dps.
13.Becquerel (Bq) - Correct Answer: The derived unit of radioactivity used
by modern metric system, the SI, is called the becquerel. The Bq is equal to
one dps or 2.7027 x 10^-11 Ci.
,14.Millicurie dose - Correct Answer: A one-millicurie dose of a
radiopharmaceutical is equal to 37 million (37 MBq).
15.Specific activity - Correct Answer: The ratio of activity per unit mass.
16.Specific activities - Correct Answer: mCi/mg, mCi/mole, MBq/mg, or
MBq/mole.
17.Physical half-life - Correct Answer: The time that it takes for a
radionuclide to decay to one-half of its original activity.
18.Decay constant relationship - Correct Answer: The product of the
physical half-life and the decay constant equals 0.693.
19.Biological half-life - Correct Answer: The time that is required for a
substance in the body to be reduced to half of its concentration via
biological excretion or metabolism.
20.Effective half-life - Correct Answer: The type of half-life that refers to the
overall loss of radioactivity from the body due to physical and biological
decay.
21.Effective half-life relationship - Correct Answer: 1/physical half-life +
1/biological half-life = 1/effective half-life.
, 22.Mo99/Tc99m generator - Correct Answer: A common type of transient
equilibrium.
23.No equilibrium - Correct Answer: When a daughter of a radionuclide
has a half-life longer than that of the parent.
24.Secular equilibrium - Correct Answer: When a parent half-life is much
longer than that of the daughter.
25.Isotopes - Correct Answer: Nuclides with the same atomic number (the
same number of protons) but a different number of neutrons.
26.Isobars - Correct Answer: Two nuclides with the same atomic mass but
different atomic numbers.
27.Radionuclide - Correct Answer: A nuclide that emits particulate or
photon energy to achieve a more stable state.
28.Alpha particle - Correct Answer: Another name for a helium ion
containing two protons and two neutrons.
29.Beta particle - Correct Answer: An electron.
30.Alpha and beta particles imaging - Correct Answer: They do not
efficiently exit the body, so they can not/are hard to detect.
Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. Internal conversion - Correct Answer: When energy from a nuclear
transition results in the emission of an orbital electron rather than a gamma
ray.
2. Internal conversion electron effect - Correct Answer: Increases the
radiation dose to the patient because energy from the electron is absorbed
into the patient's body.
3. Auger electron - Correct Answer: An orbital electron emitted when
energy from an orbital transition results in the emission of an orbital
electron rather than an x-ray.
4. Metastable - Correct Answer: When an isomeric state is long lived.
5. Characteristic of x-ray radiation - Correct Answer: The energy released
by outer shell electrons moving to now unoccupied, less energetic inner
orbitals after an electron is ejected from an inner shell orbital.
,6. Methods to create radioactive materials - Correct Answer: Radioactive
materials are produced by bombarding a target material with either ions or
with neutrons.
7. Nuclear reactor - Correct Answer: What is used to bombard elements
with neutrons.
8. Accelerator - Correct Answer: What is used to bombard elements with
protons.
9. Cyclotron produced radionuclides - Correct Answer: In-111, I-123, Ga-
67, F-18, and Tl-201.
10.Carrier-free radioisotope - Correct Answer: A radioisotope that does not
contain any nonradioactive species.
11.Activity - Correct Answer: The rate of disintegration of a radionuclide.
12.Curie - Correct Answer: The unit of activity equivalent to 3.7 x 10^10
dps.
13.Becquerel (Bq) - Correct Answer: The derived unit of radioactivity used
by modern metric system, the SI, is called the becquerel. The Bq is equal to
one dps or 2.7027 x 10^-11 Ci.
,14.Millicurie dose - Correct Answer: A one-millicurie dose of a
radiopharmaceutical is equal to 37 million (37 MBq).
15.Specific activity - Correct Answer: The ratio of activity per unit mass.
16.Specific activities - Correct Answer: mCi/mg, mCi/mole, MBq/mg, or
MBq/mole.
17.Physical half-life - Correct Answer: The time that it takes for a
radionuclide to decay to one-half of its original activity.
18.Decay constant relationship - Correct Answer: The product of the
physical half-life and the decay constant equals 0.693.
19.Biological half-life - Correct Answer: The time that is required for a
substance in the body to be reduced to half of its concentration via
biological excretion or metabolism.
20.Effective half-life - Correct Answer: The type of half-life that refers to the
overall loss of radioactivity from the body due to physical and biological
decay.
21.Effective half-life relationship - Correct Answer: 1/physical half-life +
1/biological half-life = 1/effective half-life.
, 22.Mo99/Tc99m generator - Correct Answer: A common type of transient
equilibrium.
23.No equilibrium - Correct Answer: When a daughter of a radionuclide
has a half-life longer than that of the parent.
24.Secular equilibrium - Correct Answer: When a parent half-life is much
longer than that of the daughter.
25.Isotopes - Correct Answer: Nuclides with the same atomic number (the
same number of protons) but a different number of neutrons.
26.Isobars - Correct Answer: Two nuclides with the same atomic mass but
different atomic numbers.
27.Radionuclide - Correct Answer: A nuclide that emits particulate or
photon energy to achieve a more stable state.
28.Alpha particle - Correct Answer: Another name for a helium ion
containing two protons and two neutrons.
29.Beta particle - Correct Answer: An electron.
30.Alpha and beta particles imaging - Correct Answer: They do not
efficiently exit the body, so they can not/are hard to detect.
