Fixed contamination can be best described as:

Fixed contamination refers to radioactive material that adheres strongly to surfaces and does not easily come off through regular cleaning methods. This type of contamination poses a persistent hazard, as it requires specific decontamination techniques to remove. Workers in radiological environments need to be particularly aware of fixed contamination because it can lead to extended exposure if not properly managed.

In contrast, airborne contaminants can be easily dispersed and inhaled, which is not applicable to fixed contamination. Additionally, while some contaminants may be influenced by temperature changes, fixed contamination is characterized by its strong adherence irrespective of such variables. Moreover, unlike short-lived contamination, which decays rapidly and poses risks for a limited duration, fixed contamination remains a concern until effectively eliminated, further emphasizing the importance of proper handling and decontamination practices for safety in radiation work environments.