Activity Determination
Determining the activity for Radioactive Waste:
- Count an aliquot of liquid waste from each container on a Liquid Scintillation Counter
- Convert CPM/aliquot to uCi/container
CPM/ML / EFFICIENCY = DPM/ML;
DPM/ML x number of ML's = DPM/container; then
DPM/container / 2.22 x 106 DPM/uCi = uCi/container
Liquid Scintillation Vials (LSV)
- Estimate activity from vial counts
Solid Waste (SW)
- (Total Activity Used - LW - LSV) = SW
Correcting For Decay
AF = AO e -kt
- AF = final activity
- AO = original activity
- k = 0.693/half life in days
- t = time elapsed in days
Simpler Method
AF = AO / 2x
- AF = Final activity
- AO = Original acitivity
- x = Number of days elapsed / half life in days
Questions to Radiation Safety Office.