4. The alpha spectrometer (s) will have a background, energy and efficiency determination weekly using sources traceable to NBS. 5. The gamma spectrometer (s) will have a background, energy and efficiency determined weekly, using solution traceable to NBS. Reports: All calibration data will be recorded and filed. QC will be available each month. Logged A monthly quality control report will be compiled and reported to DOE/ERSP manager. ko With carbon covy to EIc.