NDT - Non-Destructive Testing Radiographic Testing Safety Questions and Answers

Question 1

The fundamental principle of radiation protection, which states that all radiation exposure should be kept as low as reasonably achievable, is known by what acronym?

Accepted Answer

ALARA

Answer

ALARA stands for "As Low As Reasonably Achievable." It is the cornerstone principle in radiation safety, guiding all practices to minimize radiation doses to workers and the public without compromising the benefits of the activity.

Question 2

A radiographer is setting up for a field radiographic exposure. Which of the following is the immediate priority upon discovering that their radiation survey meter is not functioning correctly?

Accepted Answer

Stop all radiographic operations until a calibrated, functioning survey meter is available.

Answer

Regulatory requirements mandate that a calibrated, operable survey instrument be available and used for all radiographic operations. Proceeding without a functioning meter is a serious safety violation, as it's impossible to verify the source is shielded, determine boundary locations, or ensure public and worker safety.

Question 3

During a gamma radiography operation, the source fails to retract into the shielded position. What is the radiographer's MOST critical first action?

Accepted Answer

Secure the controlled area to prevent unauthorized entry and then notify the Radiation Safety Officer (RSO).

Answer

In an emergency where a source fails to retract, the first priority is to protect people from exposure. This is achieved by securing the controlled area to prevent anyone from entering the high radiation field. Once the area is secure, the radiographer must notify the RSO for further instructions. Attempting a retrieval without proper assessment and authorization is extremely dangerous and against procedure.

Question 4

Which of the following is a key safety advantage of using an X-ray generator compared to a gamma-ray source for industrial radiography?

Accepted Answer

The radiation from an X-ray tube can be turned off completely.

Answer

A primary safety advantage of X-ray systems is that they only produce radiation when electrically powered on. In contrast, a gamma-ray source, like Iridium-192 or Cobalt-60, emits radiation continuously and cannot be turned off, posing a constant potential hazard that requires secure shielding at all times.

Question 5

A "High Radiation Area" must be posted where an individual could receive a dose equivalent in excess of:

Accepted Answer

100 mrem in 1 hour at 30 cm from the source.

Answer

According to regulations (like those from the NRC and incorporated by states), a "High Radiation Area" is an area where radiation levels from external sources could result in an individual receiving a dose equivalent in excess of 0.1 rem (100 mrem) in 1 hour at 30 centimeters from the radiation source or from any surface that the radiation penetrates.

NDT - Non-Destructive Testing Practice Test

NDT - Non-Destructive Testing Practice Test

NDT - Non-Destructive Testing Radiographic Testing Safety Questions and Answers