CHP Radiation Protection Principles 2

Question 1

The linear no-threshold (LNT) model assumes which of the following about radiation risk at low doses?

Accepted Answer

Risk increases linearly with dose starting from zero

Answer

The LNT model postulates that cancer risk is directly proportional to dose with no safe threshold, even at very low doses.

Question 2

Which quantity is used to compare the biological effectiveness of different types of radiation on a specific tissue?

Accepted Answer

Equivalent dose (Sv)

Answer

Equivalent dose accounts for radiation type by multiplying absorbed dose by the radiation weighting factor (wR).

Question 3

A worker receives 150 mrem to the hands and 5 mrem whole-body dose. Which limit is most relevant to assess?

Accepted Answer

Extremity dose limit of 50 rem/year

Answer

Extremity (hands, feet, elbows, knees) have a separate NRC annual limit of 50 rem (500 mSv), which governs this exposure.

Question 4

What is the primary purpose of a radiological survey meter calibration?

Accepted Answer

To ensure accuracy of dose rate measurements against a traceable standard

Answer

Calibration verifies instrument response against a known source traceable to national standards (NIST), ensuring measurement accuracy.

Question 5

In the ALARA principle, which of the following is NOT one of the three primary factors considered?

Accepted Answer

Dose rate alarm threshold

Answer

ALARA practice uses time, distance, and shielding as the three fundamental tools to reduce radiation exposure.

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