A simple computing program for application of the TDCR method to standardization of pure-beta emitters

The Triple to Double Coincidence Ratio (TDCR) method is an absolute LSC method for the activity determination of many radionuclides. The method is based on a statistical description of the phenomena in a triple photomultiplier LS counter. The TDCRB-1 program was developed to calculate the radioactive concentration of a solution and is based on the TDCR method data processing. The program, in FORTRAN language has a modular structure, which easy enables to understand its functioning. The outline of the theory, a structure and algorithm of the program, as well as an example of the output results, are presented.