Efficiency transfer and coincidence summing corrections

for environmental gamma-ray spectrometry


The code is written in Fortran 77 and runs on the Windows platform through a Microsoft Excel interface by using some of its Visual Basic for Applications (VBA) features.


EFFTRAN application is limited to cylindrical detectors and samples and to axially symmetrical setups.


A separate version, called MEFFTRAN, exists for dealing with the Marinelli beakers.


HPGe, NaI and LaBr3 detectors are supported.


Gamma-gamma and gamma-X coincidences are taken into account and the correction factors for gamma rays are provided.


To get your copy of EFFTRAN, please write to Tim (dot) Vidmar (at) sckcen (dot) be.


EFFTRAN consists of three main separate Excel (.xls) modules: Efficiency Transfer, Coincidence Summing and Material (definition of new materials).


Additional modules are available for exchange of efficiency and coincidence correction data with the Canberra GENIE package.


EFFTRAN requires that within Excel and in the Regional settings of the Control Panel the decimal separator is set to a point and the thousands separator to a comma. The “Use system separators” option must be switched off.


Macro execution must be enabled.


When opening any of the EFFTRAN modules in Excel, also make sure that you are not in the VBA design mode.


Short instructions for use are provided as part of the individual modules on each worksheet.


When installing a new version of EFFTRAN, install it cleanly into a new directory and not over an existing version. Then redefine all the materials and all the detector and source models that you are using. We apologies for this inconvenience, but there is no other way of guaranteeing that the new version would work correctly.


EFFTRAN comes complete with the full source code (Fortran and VBA) and is available completely free of charge.


The user is expected to be familiar with the efficiency transfer method in gamma-ray spectrometry and the application of true coincidence summing corrections.


EFFTRAN uses and embedded copy of the XCOM package (Berger and Hubbel, 1987) as a source of the cross-section data on photon interactions.


The KORDATEN database (Arnold and Sima, 2004) serves as a source of nuclear decay data.


The freely available g77 Fortran 77 compiler is included into the distribution package.



Arnold, D. and Sima, O., 2004. Application of GESPECOR software for the calculation of coincidence summing effects in special cases. Applied Radiation and Isotopes 60, 167–172.


Berger, M. J. and Hubbell, J. H., 1987. XCOM: Photon Cross Sections on a Personal Computer. NBSIR 87-3597, National Bureau of Standards (former name of NIST), Gaithersburg, MD.


Vidmar, T., 2005. EFFTRAN - a Monte Carlo efficiency transfer code for gamma-ray spectrometry. Nuclear Instruments and Methods A 550, 603-608.


Vidmar, T., et al., 2010. Testing efficiency transfer codes for equivalence. Applied Radiation and Isotopes 68, 355-359.


Vidmar, T., Kanisch and G., Vidmar, G., 2011. Calculation of true coincidence summing corrections for extended sources with EFFTRAN. Applied Radiation and Isotopes 69, 908-911.