Question 1

A tenth-value layer is equal to ________ half-value layers.

Accepted Answer

A)  1.2 
B)  3.3 
C)  5.5 
D)  10.0 
A)  1.2 
B)  3.3 
C)  5.5 
D)  10.0 B

Question 2

Health physics is concerned with minimizing radiation dose to ________________.

Accepted Answer

A)  radiation physicists 
B)  radiation workers 
C)  the public 
D)  All of the above 
A)  radiation physicists 
B)  radiation workers 
C)  the public 
D)  All of the above D

Question 3

If a technologist is receiving 2 mGyt/hr standing 1 foot from the patient during fluoroscopy, what is his rate of exposure when he steps back to a distance of 2 feet from the patient?

Accepted Answer

A)  0.50 mGyt/hr 
B)  0.74 mGyt/hr 
C)  1 mGyt/hr 
D)  1.75 mGyt/hr 
A)  0.50 mGyt/hr 
B)  0.74 mGyt/hr 
C)  1 mGyt/hr 
D)  1.75 mGyt/hr A

Question 4

When using the inverse square law during fluoroscopy, the patient should be considered a(n) ____________ source of radiation.

Accepted Answer

A)  area 
B)  linear 
C)  round 
D)  point 
A)  area 
B)  linear 
C)  round 
D)  point

Question 5

The three cardinal principals of radiation protection involve ____________________.

Accepted Answer

A)  dose, shielding, and exposure 
B)  exposure, shielding, and ALARA 
C)  time, distance, and shielding 
D)  ALARA, time, and distance 
A)  dose, shielding, and exposure 
B)  exposure, shielding, and ALARA 
C)  time, distance, and shielding 
D)  ALARA, time, and distance

Question 6

The concept of effective dose accounts for the __________________.

Accepted Answer

A)  different types of radiation and RBE 
B)  relative radiosensitivity of various tissues and organs 
C)  the person's distance from the source 
D)  Both A and B 
A)  different types of radiation and RBE 
B)  relative radiosensitivity of various tissues and organs 
C)  the person's distance from the source 
D)  Both A and B

Question 7

Exposure is measured by multiplying _________________ by ___________________.

Accepted Answer

A)  shielding thickness, exposure time 
B)  exposure rate, exposure time 
C)  exposure rate, shielding thickness 
D)  exposure time, distance 
A)  shielding thickness, exposure time 
B)  exposure rate, exposure time 
C)  exposure rate, shielding thickness 
D)  exposure time, distance

Question 8

If a technologist is exposed to 4 mGyt/hr for 45 minutes during a fluoroscopy exam, what will be her total exposure?

Accepted Answer

A)  1 mGyt 
B)  2 mGyt 
C)  3 mGyt 
D)  4 mGyt 
A)  1 mGyt 
B)  2 mGyt 
C)  3 mGyt 
D)  4 mGyt

Question 9

What is the NCRP?

Accepted Answer

A)  National Council of Radiation Protection. 
B)  National Council of Radiology Personnel. 
C)  National Committee on Radiation Prevention. 
D)  National Committee on Random Particles. 
A)  National Council of Radiation Protection. 
B)  National Council of Radiology Personnel. 
C)  National Committee on Radiation Prevention. 
D)  National Committee on Random Particles.

Question 10

The first radiation health physicists worked with ___________________.

Accepted Answer

A)  the atom bomb 
B)  x-ray tubes 
C)  CT scanners 
D)  nuclear medicine 
A)  the atom bomb 
B)  x-ray tubes 
C)  CT scanners 
D)  nuclear medicine

Question 11

The NCRP publishes annual dose limits for _____________ exposure.

Accepted Answer

A)  public 
B)  occupational 
C)  prenatal 
D)  All of the above 
A)  public 
B)  occupational 
C)  prenatal 
D)  All of the above

Question 12

What is the best approach to occupational radiation exposure?

Accepted Answer

A)  Maintain the annual dose limits. 
B)  Follow the concept of ALARA. 
C)  Reduce your exposure to half the NCRP dose limits. 
D)  Wear protective apparel at all times. 
A)  Maintain the annual dose limits. 
B)  Follow the concept of ALARA. 
C)  Reduce your exposure to half the NCRP dose limits. 
D)  Wear protective apparel at all times.

Question 13

Dose limits are based on a ________________ dose-response relationship to radiation.

Accepted Answer

A)  nonlinear, nonthreshold 
B)  linear, nonthreshold 
C)  linear, threshold 
D)  nonlinear, threshold 
A)  nonlinear, nonthreshold 
B)  linear, nonthreshold 
C)  linear, threshold 
D)  nonlinear, threshold

Question 14

If the HVL in a radiology department is 0.25 mm Pb, then how thick should a shield be to reduce the technologists' exposure to one fourth the incident scatter?

Accepted Answer

A)  0.125 mm Pb 
B)  0.25 mm Pb 
C)  0.5 mm Pb 
D)  1.0 mm Pb 
A)  0.125 mm Pb 
B)  0.25 mm Pb 
C)  0.5 mm Pb 
D)  1.0 mm Pb

Question 15

The NCRP makes _________________ regarding dose limits.

Accepted Answer

A)  laws 
B)  recommendations 
C)  requirements 
D)  measurements 
A)  laws 
B)  recommendations 
C)  requirements 
D)  measurements

Question 16

The dose limits established by the NCRP are derived from _________________.

Accepted Answer

A)  government laws 
B)  newspaper articles 
C)  NCRP research 
D)  BEIR and NSC reports 
A)  government laws 
B)  newspaper articles 
C)  NCRP research 
D)  BEIR and NSC reports

Question 17

The dose limit for the general public is _______ the dose limit for occupational exposure.

Accepted Answer

A)  1/10 
B)  1/5 
C)  1/2 
D)  3/4 
A)  1/10 
B)  1/5 
C)  1/2 
D)  3/4

Exam 35: Health Physics

A tenth-value layer is equal to ________ half-value layers.

Health physics is concerned with minimizing radiation dose to ________________.

If a technologist is receiving 2 mGyt/hr standing 1 foot from the patient during fluoroscopy, what is his rate of exposure when he steps back to a distance of 2 feet from the patient?

When using the inverse square law during fluoroscopy, the patient should be considered a(n) ____________ source of radiation.

The three cardinal principals of radiation protection involve ____________________.

The concept of effective dose accounts for the __________________.

Exposure is measured by multiplying _________________ by ___________________.

If a technologist is exposed to 4 mGyt/hr for 45 minutes during a fluoroscopy exam, what will be her total exposure?

What is the NCRP?

The first radiation health physicists worked with ___________________.

The NCRP publishes annual dose limits for _____________ exposure.

What is the best approach to occupational radiation exposure?

Dose limits are based on a ________________ dose-response relationship to radiation.

If the HVL in a radiology department is 0.25 mm Pb, then how thick should a shield be to reduce the technologists' exposure to one fourth the incident scatter?

The NCRP makes _________________ regarding dose limits.

The dose limits established by the NCRP are derived from _________________.

The dose limit for the general public is _______ the dose limit for occupational exposure.

Essential Concepts of Radiologic Science

The Structure of Matter

Electromagnetic Energy

Electricity, Magnetism, and Electromagnetism

The X-ray Imaging System

The X-ray Tube

X-ray Production

X-ray Emission

X-ray Interaction with Matter

Radiographic Image Quality

Control of Scatter Radiation

Screen-Film Radiography

Screen-Film Radiographic Technique

Medical Imaging Computer Science

Computed Radiography

Digital Radiography

Digital Radiographic Technique

Viewing the Digital Image

Screen-Film Radiographic Artifacts

Screen-Film Radiographic Quality Control

Digital Radiographic Artifacts

Digital Radiographic Quality Control

Mammography

Mammography Quality Control

Fluoroscopy

Digital Fluoroscopy

Interventional Radiology

Computed Tomography

Human Biology

Fundamental Principles of Radiobiology

Molecular Radiobiology

Cellular Radiobiology

Deterministic Effects of Radiation

Stochastic Effects of Radiation

Designing for Radiation Protection

Radiography/Fluoroscopy Patient Radiation Dose

Computed Tomography Patient Radiation Dose

Patient Radiation Dose Management

Occupational Radiation Dose Management

Filters

Exposure is measured by multiplying _ by ___.