This model procedure can be used by applicants and licensees for checking and testing dose calibrators. Model Procedure 1. Test for the following at the indicated frequency. Consider repair, replacement, or arithmetic correction if the dose calibrator falls outside the suggested tolerances. After repair, adjustment, or relocation of the dose calibrator, such that proper function of the ionization chamber or electronics would likely be in doubt, repeat the above tests as appropriate.
Constancy means reproducibility in measuring a constant source over a long period of time.
Consider using two or more sources with different photon energies and activities. 3.2 Measure background at the same setting, and subtract or confirm the proper operation of the automatic background circuit if it is used. Using one of the sources, repeat the above procedure for all commonly used radioisotope settings. Plot or log the results. 3.5 Establish an action level or tolerance for each recorded measurement at which the individual performing the test will automatically notify the authorized nuclear pharmacist or the radiation safety officer of a suspected malfunction of the calibrator.