Patent Document ID: 4652751
Application ID: 06692890
Patent Status: 1

Claim One:
1. Method for calibrating a liquid scintillation counter comprising, for a number of reference solutions containing isotopes of known decay rates, the counting of a number of coincident pulses caused in at least two photodetectors by photons produced by the decay of the isotopes within a first known time interval, for obtaining the scintillation pulse frequency of each reference solution and the calculating of the counting efficiency for each reference solution by dividing said scintillation pulse frequency by the known decay rate, so as to provide an experimentally determined counting efficiency, characterized in that for each reference solution it is at first measured within a second known time interval, which completely or partially can overlap said first known time interval, how many photoelectrons the photons in each coincident scintillation pulse have caused in at least one photodetector whereafter a calibration vector comprising at least one unknown calibration parameter is determined by fitting a function based on theoretical grounds containing said calibration vector to said experimentally determined counting efficiency and by fitting a function based on theoretical grounds containing said calibration vector, to measured photoelectron numbers.