DOE Core Radiological Control Technician (RCT) Practice Exam 2026 - Free Radiological Control Technician Practice Questions and Study Guide

The key idea is using measurable contamination to decide if decontamination is needed. A surface requires decontamination when the removable contamination detected by a smear test exceeds established action levels, or when the contamination cannot be removed by routine housekeeping. Smear testing provides a quantitative check of removable contamination, and action levels set the threshold at which further cleaning or control measures are required to protect people and the environment. If routine cleaning can bring the contamination below those levels, decontamination isn’t necessary. Visual cues like a color change or being in a fenced area don’t reliably indicate radiological contamination or the need for decontamination, and mere dustiness isn’t a radiological trigger. So the decision hinges on smear results relative to action levels or on the inability of routine cleaning to remove contamination.