Spent Source 1
Spent Source 1 : A source that is no longer suitable for its intended purpose as a result of radioactive decay. ! Note that a spent source may still represent a radiological hazard. Unsealed Source: A source that does not meet the definition of a sealed source. Vulnerable Source: A radioactive source for which the control is inadequate to provide assurance of long term safety and security, such that it could relatively easily be acquired by unauthorized persons