CHP Radiation Protection Principles 3

Question 1

The committed effective dose equivalent (CEDE) accounts for dose from:

Accepted Answer

Internally deposited radionuclides integrated over 50 years

Answer

CEDE integrates the dose from internally deposited radionuclides over a 50-year period (70 years for children) following a single intake.

Question 2

Which radiation protection quantity is used to assess stochastic risk across different tissues and organs?

Accepted Answer

Effective dose

Answer

Effective dose sums equivalent doses to individual organs weighted by tissue weighting factors (wT), reflecting whole-body stochastic risk.

Question 3

A contaminated surface reads 10,000 dpm/100 cm². This value represents:

Accepted Answer

Surface contamination level in disintegrations per minute

Answer

Disintegrations per minute per 100 cm² (dpm/100 cm²) is a standard unit for quantifying surface contamination activity.

Question 4

What does the term 'specific activity' describe?

Accepted Answer

Activity per unit mass of a radioactive material

Answer

Specific activity is the radioactivity per unit mass (e.g., Bq/g or Ci/g) of a given radionuclide or radioactive material.

Question 5

Under the concept of optimization in radiation protection, the goal is to keep doses:

Accepted Answer

As low as reasonably achievable considering economic and social factors

Answer

Optimization (ALARA) requires reducing doses below limits to levels that are reasonable considering economic and societal benefit versus detriment.

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