VIR Radiation Safety & Protection

Question 1

What does the acronym ALARA stand for in radiation protection?

Accepted Answer

As Low As Reasonably Achievable

Answer

Adjusted Levels Allowing Radiation Access

Answer

Acceptable Limits for Radiation Application

Answer

Authorized Levels of Radiation Allowance

Question 2

According to NCRP recommendations, what is the annual occupational whole-body effective dose limit for radiation workers?

Accepted Answer

50 mSv (5 rem)

Answer

20 mSv (2 rem)

Answer

100 mSv (10 rem)

Answer

150 mSv (15 rem)

Question 3

Which type of radiation interaction is the primary source of scatter radiation reaching the VIR operator during fluoroscopy?

Accepted Answer

Compton scattering

Answer

Photoelectric effect

Answer

Coherent (Rayleigh) scattering

Answer

Pair production

Question 4

What is the FDA-mandated maximum entrance exposure rate for standard (non-high-level control) fluoroscopy equipment?

Accepted Answer

10 R/min (88 mGy/min)

Answer

5 R/min (44 mGy/min)

Answer

20 R/min (176 mGy/min)

Answer

50 R/min (440 mGy/min)

Question 5

The three cardinal principles of radiation protection are:

Accepted Answer

Time, distance, and shielding

Answer

Shielding, monitoring, and documentation

Answer

ALARA, filtration, and collimation

Answer

Dosimetry, training, and emergency planning

Question 6

According to the inverse square law, if an operator moves from 1 meter to 2 meters from the X-ray source, the radiation intensity:

Accepted Answer

Decreases by 75%

Answer

Decreases by 25%

Answer

Decreases by 50%

Answer

Decreases by 88%

Question 7

Which type of personal dosimeter provides immediate, real-time dose rate readings during a VIR procedure?

Accepted Answer

Electronic personal dosimeter (EPD)

Answer

Film badge dosimeter

Answer

Thermoluminescent dosimeter (TLD)

Answer

Optically stimulated luminescence (OSL) dosimeter