©SIRJOEL 2024/2025 ALL RIGHTS RESERVED.
RAD117 Final Review Questions And
Answers 100% Guaranteed Pass
43 mCi of Gallium-68 (half life = 280 days) is kept in storage in the nuclear medicine
department "hot lab". How much Ga-68 remains after 1,680 days? - Answer✔0.67 mCi
Radioactivity can be best defined as - Answer✔Breakdown of atomic nuclei
The curie (Ci) is equal to - Answer✔3.7 x 10^10 Bq
The process of one atom becoming another atom by means of radioactive emission (decay) is
called - Answer✔Transmutation
Which of the following are used in nuclear medicine as diagnostic radiopharmaceuticals? -
Answer✔Xenon-133, Technetium-99
Which of the following radionuclides are isobars? - Answer✔Ni, Co, Fe
Handling of radiopharmaceuticals by nuclear medicine technologists requires that they wear lead
shielding sufficient to protect them from excessive radiation exposure. - Answer✔False
A sign indicating "Caution: Radiation Area" means that a person entering a restricted area can
receive an exposure that is: - Answer✔Greater than 5 mR per hour, but less than 100 mR per
hour
Which of the following pertains to protection practices in the nuclear medicine "hot lab"? -
Answer✔No food or drink consumed
Latex gloves can stop alpha particles. - Answer✔True
The exposure rate at 1 foot (30 cm) from a patient who has been given a radiopharmaceutical is
.15 mR/hour. What is the exposure rate 6 feet (180 cm) from the same patient? - Answer✔.004
mR/hour
The use of personal dosimeters is limited to determining the whole-body dose monitoring only. -
Answer✔False
Radioactive half-life is best defined as the time required for a radionuclide to... -
Answer✔Become half as radioactive
An atomic nucleus acquires a certain particle transforming a proton into a neutron. What is this
particle? - Answer✔Positron
1|Page
, ©SIRJOEL 2024/2025 ALL RIGHTS RESERVED.
Palliation is a word that means: - Answer✔Relieving symptons
A radiation therapist is a: - Answer✔Technologist
Radiosensitivity in the context of radiation oncology means that cancer cells are: -
Answer✔Radiosensitive to radiation similar to healthy cells from which they originate
Tolerance in the context of radiation oncology that means: - Answer✔The radiation treatment
can cure, but can also injure or kill healthy tissue
TD5/5 is a way of measuring: - Answer✔Complication rates
Cancer cells are considered more susceptible to ionizing radiation when they are: -
Answer✔Oxygenated
The ratio of the dose required to treat a hypoxic tumor to the dose required to treat the same
tumor under oxygenated conditions defines: - Answer✔OER
Which of the following radiations is most effective at treating superficial cancerous lesions like
malignant melanoma of Kaposi's sarcoma? - Answer✔Electron beam
What radiation has the highest LET? - Answer✔Gamma rays
In radiation therapy, the primary benefit of fractionation is: - Answer✔Healthy tissue sparing
Intracavitary and intersitial implantation of radionuclide sources are two types of: -
Answer✔Brachytherapy
Because of the magnitude of x-ray energy applied to treatment, patients, treated on linear
accelerators emit radiation after each treatment. - Answer✔False
The minimum distance that a person should stand away from a patient with a radioactive implant
when not performing patient care tasks or when doing portable radiography is: - Answer✔6 feet
For the most part, the shielding requirements for radiation therapy require the therapists to wear
lead aprons while treatments are taking place on the linear accelerator. - Answer✔False
Radioactive dose in CT does not depend on filtration. - Answer✔False
As with radiography, the energy of the beam controls penetrability and scatter production. In CT,
the kVp is usually kept in the range of ___-___. - Answer✔120-130
The CT dose index (CTDI) can be used to perform calibration checks for quality control
purposes. - Answer✔True
The ____ _____ is the way in which the continuous spiral of the scan is stretched out or
compressed. - Answer✔Scan pitch
Filtration in the x-ray tube is intended to reduce radiation dose to the skin caused by... -
Answer✔Long wavelength x-ray photons
2|Page
RAD117 Final Review Questions And
Answers 100% Guaranteed Pass
43 mCi of Gallium-68 (half life = 280 days) is kept in storage in the nuclear medicine
department "hot lab". How much Ga-68 remains after 1,680 days? - Answer✔0.67 mCi
Radioactivity can be best defined as - Answer✔Breakdown of atomic nuclei
The curie (Ci) is equal to - Answer✔3.7 x 10^10 Bq
The process of one atom becoming another atom by means of radioactive emission (decay) is
called - Answer✔Transmutation
Which of the following are used in nuclear medicine as diagnostic radiopharmaceuticals? -
Answer✔Xenon-133, Technetium-99
Which of the following radionuclides are isobars? - Answer✔Ni, Co, Fe
Handling of radiopharmaceuticals by nuclear medicine technologists requires that they wear lead
shielding sufficient to protect them from excessive radiation exposure. - Answer✔False
A sign indicating "Caution: Radiation Area" means that a person entering a restricted area can
receive an exposure that is: - Answer✔Greater than 5 mR per hour, but less than 100 mR per
hour
Which of the following pertains to protection practices in the nuclear medicine "hot lab"? -
Answer✔No food or drink consumed
Latex gloves can stop alpha particles. - Answer✔True
The exposure rate at 1 foot (30 cm) from a patient who has been given a radiopharmaceutical is
.15 mR/hour. What is the exposure rate 6 feet (180 cm) from the same patient? - Answer✔.004
mR/hour
The use of personal dosimeters is limited to determining the whole-body dose monitoring only. -
Answer✔False
Radioactive half-life is best defined as the time required for a radionuclide to... -
Answer✔Become half as radioactive
An atomic nucleus acquires a certain particle transforming a proton into a neutron. What is this
particle? - Answer✔Positron
1|Page
, ©SIRJOEL 2024/2025 ALL RIGHTS RESERVED.
Palliation is a word that means: - Answer✔Relieving symptons
A radiation therapist is a: - Answer✔Technologist
Radiosensitivity in the context of radiation oncology means that cancer cells are: -
Answer✔Radiosensitive to radiation similar to healthy cells from which they originate
Tolerance in the context of radiation oncology that means: - Answer✔The radiation treatment
can cure, but can also injure or kill healthy tissue
TD5/5 is a way of measuring: - Answer✔Complication rates
Cancer cells are considered more susceptible to ionizing radiation when they are: -
Answer✔Oxygenated
The ratio of the dose required to treat a hypoxic tumor to the dose required to treat the same
tumor under oxygenated conditions defines: - Answer✔OER
Which of the following radiations is most effective at treating superficial cancerous lesions like
malignant melanoma of Kaposi's sarcoma? - Answer✔Electron beam
What radiation has the highest LET? - Answer✔Gamma rays
In radiation therapy, the primary benefit of fractionation is: - Answer✔Healthy tissue sparing
Intracavitary and intersitial implantation of radionuclide sources are two types of: -
Answer✔Brachytherapy
Because of the magnitude of x-ray energy applied to treatment, patients, treated on linear
accelerators emit radiation after each treatment. - Answer✔False
The minimum distance that a person should stand away from a patient with a radioactive implant
when not performing patient care tasks or when doing portable radiography is: - Answer✔6 feet
For the most part, the shielding requirements for radiation therapy require the therapists to wear
lead aprons while treatments are taking place on the linear accelerator. - Answer✔False
Radioactive dose in CT does not depend on filtration. - Answer✔False
As with radiography, the energy of the beam controls penetrability and scatter production. In CT,
the kVp is usually kept in the range of ___-___. - Answer✔120-130
The CT dose index (CTDI) can be used to perform calibration checks for quality control
purposes. - Answer✔True
The ____ _____ is the way in which the continuous spiral of the scan is stretched out or
compressed. - Answer✔Scan pitch
Filtration in the x-ray tube is intended to reduce radiation dose to the skin caused by... -
Answer✔Long wavelength x-ray photons
2|Page
