NANTeL Radiation Protection and ALARA 3

Question 1

Which radiological survey instrument is best suited for detecting low-energy beta contamination on surfaces?

Accepted Answer

Geiger-Mueller (GM) pancake probe

Answer

A GM pancake probe has a thin window that allows low-energy beta particles to enter and be detected, making it ideal for surface contamination surveys.

Question 2

At nuclear power plants, what is the primary source of airborne radioactivity that workers in the reactor coolant system area may encounter?

Accepted Answer

Noble gas fission products and radioiodines from fuel defects

Answer

Fuel defects allow fission product noble gases and radioiodines to escape into the reactor coolant, making them the primary airborne concern.

Question 3

What is the committed effective dose equivalent (CEDE) used to account for?

Accepted Answer

The long-term dose from an internally deposited radionuclide over 50 years

Answer

CEDE represents the total effective dose that will be received over 50 years as a result of a single intake of radioactive material.

Question 4

When using a self-reading pocket dosimeter (SRPD), a reading that has gone off-scale should prompt the worker to do what?

Accepted Answer

Immediately exit the area and notify radiation protection personnel

Answer

An off-scale SRPD indicates the worker may have received a significant dose and requires immediate exit and RP evaluation to protect health and meet regulatory requirements.

Question 5

Which of the following best describes 'as low as reasonably achievable' (ALARA) in regulatory context?

Accepted Answer

Keeping radiation doses as far below regulatory limits as practicable

Answer

ALARA requires active effort to keep doses well below regulatory limits using reasonable means, not merely complying with those limits.

(NANTeL) National Academy for Nuclear Training e-Learning Practice Test

(NANTeL) National Academy for Nuclear Training e-Learning Practice Test

NANTeL Radiation Protection and ALARA 3