ebasoovitavate materjalide (saasteainete) sissetulek radioaktiivsetest materjalidest; kahjulike lisandite sattumine materjali (vt kahjulik lisand, radioaktiivne saastumine)
the introduction of unwanted material, such as pollution caused by deposits of radioactive materials or the introduction of impurities into a substance (see: impurity, radioactive contamination)
