Texas Industrial Radiography Gamma Practice Test

What is the term for radioactive material permanently fixed in a capsule to prevent the release of radioactive material?

1. Internal Contamination

2. Fixed Contamination

3. An Isotope

4. A Sealed Source

The correct answer is: A Sealed Source

The term for radioactive material that is permanently contained within a capsule to prevent the escape of that material is known as a sealed source. This encapsulation serves to ensure that the radioactive material is stabilized and minimizes the risk of contamination. Sealed sources are commonly used in various applications, including industrial radiography, where they provide a safe and controlled method to emit radiation for imaging purposes. By being sealed within a robust container, these sources allow for the use of radioactive materials without posing a significant risk of direct exposure or environmental contamination, as the radiation is contained within the protective housing. Other terms do not accurately describe this concept. For example, internal contamination refers to the presence of radioactive materials within the body, which occurs through ingestion or inhalation. Fixed contamination suggests that radioactive materials are adhered to a surface but does not guarantee that the materials are entirely contained, similar to how a sealed source functions. An isotope is a variant of a chemical element with a specific number of neutrons, but it does not imply containment or encapsulation in a protective manner. Thus, the correct choice, a sealed source, effectively captures the intent of the question regarding the containment of radioactive materials.