If the lab performs the same type of procedure over a long period of time, it is reasonable to assume that the activity in the waste will be known from historical data. Keep in mind that if procedures change, the historical data will no longer reflect the actual activity. The amount of activity listed on the waste container dictates how the waste is processed. Therefore, it is important that the amount listed be a close approximation. Never attempt to use a Geiger counter to quantify the activity in a waste container.
Contamination control is the responsibility of everyone who uses radioactive materials.
Directly after performing a procedure using radioactive material, a survey must be done by laboratory personnel to detect the presence of radioactive contamination. The lab is also responsible for performing decontamination as necessary. It is important that an instrument be used which is appropriate for the type of radiation. For labs using 3 H, liquid scintillation counting is the only method to check for contamination. No additional approval is necessary.