Generic Radiation Worker Training Supplemental Worker Certification Practice Test

Contamination can exist as coatings on surfaces, removable dust on surfaces, or as separate particles suspended or deposited as distinct units. Fixed contamination forms a film that sticks to a surface; loose contamination is contaminant that is on a surface but can be brushed or wiped away; airborne contamination moves with the air and may be in particles or droplets. The phrase “individual particles” points to actual discrete specks that remain as separate units rather than part of a continuous layer. That’s what discrete radioactive particles are: separate, individual particulates rather than a surface film.