**EFFTRAN**

**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**, **LaBr3, CZT **and**
CLYC** 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.

If you are a registered **ORTEC GammaVision** user, you may be interested in trying a product
called LVis, which provides a comprehensive integrated environment for spectrum
analysis combined with automated EFFTRAN calculations and the necessary data
management. For more details please consult Dr. Marc Breidenbach at AMETEK
(marc (dot) breidenbach (at) ametek (dot) com). Please note that I have no
business relationship with ORTEC. I do not endorse or promote their products in
general and do not receive any financial incentive to do so.

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 in
the distribution package.

**References**

Andreev, D.S., Erokhina, K.I., Zvonov, V.S.,
Lemberg, I.Kh. 1972. Consideration of cascade transitions in determining the
absolute yield of gamma rays. Instruments and Experimental Techniques 15, 1358
(Englishtranslation).

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.

Blauuw, M., Gelsema, S.J. 2003. Cascade summing in gamma-ray
spectrometry in Marinelli-beaker geometries: the third efficiency curve.
Nuclear Instruments and Methods A 505, 311–315.

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

Vidmar, T., Likar, A. 2005. Calculation of
total efficiencies of extended samples for HPGe detectors. Nuclear Instruments
and Methods A 555, 251–254.

Vidmar, T., Korun, M. 2006. Calculation of
"LS-curves" for coincidence summing corrections in gamma-ray
spectrometry. Nuclear Instruments and Methods A 556, 543-546.

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

T. Vidmar, M. Capogni, M. Hult, S. Hurtado, J.
Kastlander, G. Lutter, M.-C. Lépy, J. Martinkovič, H. Ramebäck, O. Sima,
F. Tzika, G. Vidmar. 2014. Equivalence of computer codes for calculation of
coincidence summing correction factors. Applied Radiation and Isotopes 87,
336-341.

T. Vidmar, A. Camp, S. Hurtado, H. Jäderström,
J. Kastlander, M-C. Lépy, G. Lutter, H. Ramebäck, O. Sima, A. Vargas. 2016.
Equivalence of computer codes for calculation of coincidence summing correction
factors – Part II. Applied Radiation and Isotopes 109, 482-486.