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Radioactive Software

Ecolego can be adapted and customised for any specific usage and needs in conducting risk assessments of complex dynamic systems.

Ecolego’s primary use has been in conducting safety and risk assessments in the Nuclear Sector, including safety assessments of nuclear facilities, medical, industrial and research facilities that make peaceful uses of radioisotopes, nuclear legacy sites and radioactive waste management facilities.

Ecolego has been applied to the mining sector when it comes to activities to be implemented at uranium (and other elements) mining and legacy sites. We offer support to clients for implementation of own models specific to the actions of a mine and its remediation.

The contaminated land market can benefit from models including assessment of impacts of chemical or other hazards to the environment. Such models can be developed and included in the Ecolego model library, for instance, for chemical transfer in connection to traditional waste management (landfills, etc.).

Simulation Modelling and Risk Assessment Software

Ecolego is a software tool for development of mathematical models of dynamic systems and processes and performing deterministic and probabilistic simulations with the models. The models can consist of analytical expressions, systems of Ordinary Differential Equations (ODE) or a combination of the two. Ecolego includes state-of-the-art numerical solvers for numerical solution of the systems of ODEs. It incorporates an engine for performing probabilistic propagation of parameter uncertainty through the models using Monte Carlo and Latin Hypercube sampling, which can be used for performing uncertainty and sensitivity analyses.

Ecolego Applications

Ecolego is well-established in the international market with customers throughout the world. The following are a few of the projects references to which Ecolego has been applied:

  • Swedish near-surface and geological repositories
  • Finnish geological repository
  • Fukushima, Japan
  • Ukrainian Pridniprovskiy Chemical Plant
  • NORM and legacy uranium sites in Central Asia (Uzbekistan, Kyrgyzstan, etc.)
  • Oil, Gas and Mining industries in the Middle East (UAE) and Africa (South Africa)

Example of applications

Packaging and Transportation

Safe packaging and transportation of materials is critical to the success of DOE operations. Annually, DOE transports about 5,000 shipments including radioactive, hazardous, and non-hazardous materials. Located within EM, the Office of Packaging & Transportation (OPT) supports field sites in achieving safe transportation through development and management of policy, oversight programs, automated tools, and collaborative forums. These programs and tools are available to the entire DOE complex.

Office of Packaging and Transportation Fiscal Year Highlights

Packaging Certification Program

The Atomic Energy Act of 1954, as amended, gives DOE broad authorities to regulate all aspects of activities involving radioactive materials that are undertaken by DOE or on its behalf, including transportation. OPT manages the program for the packaging certification of Type B and fissile material packaging which conform with U.S. Department of Transportation and U.S. Nuclear Regulatory Commission requirements. For additional information about the DOE Packaging Certification Program, visit the Radioactive Material Packaging (RAMPAC) website. The program includes the following:

  • providing guidance for preparing Safety Analysis Reports for Packaging;
  • reviewing and approving packaging designs;
  • issuing DOE Certificates of Compliance;
  • reviewing and recertifying Certificates of Compliance;
  • curtailing and suspending the use of specific packages, when warranted; and
  • reviewing and approving quality assurance programs for Type B and fissile materials radioactive materials packaging.

The Packaging Certification Program conducts routine training for radioactive packaging activities related to Safety Analysis Report for Packagings preparation and packaging quality assurance, maintenance and operations.

Automated Tools

(Note that these tools require account access and are generally limited to DOE users, contractors, and certain stakeholders.)

The Automated Transportation Logistics and Analysis System is a web-based freight management system allowing users to manage inbound and outbound shipments by highway, rail, and air.

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Permits registered users to access software used in packaging and transportation determinations.

The Transportation Routing Analysis GIS allows users to analyze potential routes for shipment of hazardous materials including nuclear material and spent nuclear fuel. It is compatible with the NRC’s RADTRAN software for performing population risk assessments and accident dosing models.

An unclassified tracking and communication system which can monitor the progress of various «high visibility» shipments.

Stakeholder Engagement


Collaboration and coordination with jurisdictions along the transportation corridors is key in accomplishing the EM cleanup mission. The purpose of the NTSF is to bring transparency, openness, and accountability to DOE’s offsite transportation activities through collaboration with state and tribal governments. NTSF members may obtain additional information at the NTSF website.

TEPP provides the tools for planning, training and exercises, and technical assistance to assist state and Tribal authorities in preparing for response to a transportation incident involving DOE shipments of radioactive material. For more information including class schedule, please visit the TEPP website.

Oversight and Support Programs

Motor Carrier Evaluation Program (MCEP)

OPT manages and implements the DOE MCEP in accordance with DOE Order 460.2. MCEP maintains and monitors a list of evaluated motor carriers from which DOE/NNSA field offices and contractors select to ship their radioactive materials and hazardous wastes.

Transportation Compliance Assessment Program (TCAP)

In accordance with DOE Order 460.2, Departmental Materials Transportation and Packaging Management, DOE sites must evaluate contractors/subcontractor transportation and packaging operations at each facility every three years. TCAP provides a framework for accomplishing these evaluations.

Transportation Management Council (TMC) and Packaging Management Council (PMC)

OPT serves as federal sponsor and advisor for DOE’s TMC and PMC. Membership is made up of DOE and NNSA federal and contractor personnel involved in transportation and packaging operations. TMC provides a forum to address challenges and best practices in shipping operations and transportation safety activities. PMC provides a similar forum for DOE packaging activities.

Radioactive Software

Example Screen Shot


RadDecay (Radiation Decay) provides radioactive decay information for more than 3000 radionuclides, (3713 to be exact).
Data provided include: The elements physical properties (like density, melting point, and specific heat), and the elements radionuclides and nuclides data (such as half life, daughter nuclides, decay chain series, probabilities per decay, and decay product energies for alphas, betas, gammas, and X-rays).

The radioactive elements can be searched, to find an element that emits a particular Alpha, Beta, or Photon emission. For example, say a photon spectrum gives two photon peaks at 150 keV and 420 keV. The radioactive elements can be searched for photons that give a 150 keV, then the previously found elements can be searched for the 420 keV photon. Hence Photon spectrums can be matched to photon emitters.

The radionuclide can be selected from an Alphabetical list, or selected from a Periodic Table. The radionuclides can be graphed in the decay chain series, and in the nuclide abundance table. Also a decay (half-life) calculation can be performed, and the resulting activities can be graphed.
Full coping to clipboard and output to printer is supported.


My original MS-Windows developed RadDecay (version 1, 1994) utilised the ‘RADIOACTIVE DECAY DATA TABLES by David C. Kocher’. The capabilities of this RadDecay program increased with the later versions (version 2 and 3).
However, these applications had limited nuclides data, being based on 497 radionuclides of the ‘Kocher’ tables.

This latest version (Version 4), is a total rewrite of the older RadDecay versions, with enhanced capabilities (i.e. more graphical functions).
However the most significant update, and enhanced capability, is that the RadDecay application now utilises the enhanced and expanded ENDSF data files (see below). These data files provide much more radionuclides (over 3000 compared to 479 of the Kocher tables), and much more data (such as spectrums) for all radionuclides.

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All nuclide data was extracted from the:
«Evaluated Nuclear Structure Data File» (ENSDF)
National Nuclear Data Center,
Brookhaven National Laboratory,
Upton, NY 11973-5000

The ENSDF data files were retrieved from the WorldWideWeb site of: «NNDC Online Data Service» http://www.nndc.bnl.gov/

The ENSDF text based files were re-formatted to Borland Delphi records, for use in this RadDecay application.


This program and data files are freeware, hence the Authors* give permission for making copies of this program, and using the data files contained within, ‘Without Restriction’, (subject to the NO-Liability clause).
Due to legal concerns, the user must accept a user licence, and NO-liability clause, which will display the first time the application is run.

The program code (RadDecay.exe) is my work, yet the data files (*.REC) are derived from outside sources, (ENSDF web site and literature sources). The Nuclides data (Alphas.rec, Betas.rec, Daughter.rec, Gammas.rec, Nuclide.rec, and Xrays.rec) were direct translations of the ENSDF text data files. The authors of the ENSDF data files have given permission for utilising the data files, with the requirement for acknowledging the source of the data*.

* The ENSDF Web site (see above) contains information on the public status of the ENSDF data, and in addition email confirmation has been received (from Mr J. K. Tuli, Brookhaven National Laboratory) that this RadDecay application is permitted to download and utilise the ENDSF data, (and requested that the source of the data be acknowledged).

If you use the program, it would be nice to get an Email. I would also like to know your comments, concerns, or bugs in the program.


No liability whatsoever for the program operation, use of the data, accuracy of the data, loss of information, or anything else is accepted by the author of this program.
Also, no doubt the authors of the ENDSF radiation data files tables offer NO liability for the accuracy of the ENDSF data.

To Due to legal concerns, the user must accept a user licence, and NO-liability clause, which will display the first time the application is run.

** WARNING ** Missing Data

I have been infomed that the ENSDF files I downloaded, had missing data!. Thus some radionuclides have missing information.
I will thus need to find a better source for the ENSDF files. I am still in the process of obtaining better data files.


NOTE: Please note the above Missing Data warning.

The above is a compressed ZIP file of the executable setup file called: Setup_RadDecayV4_2016_09_22.exe
Download this file, unzip it, and run the installer executable.


Example Screen Shot

(917 kB ZIP file)
The above is a compressed ZIP file of the executable setup file called: RadDecayV3_Installer_2016_09_22.exe
Download this file, unzip it, and run the installer executable.

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Anthony W. Knight, PhD, MBA, CNMT, RT(N), FSNMMITS
Clinical Associate Professor
Administrative Program Director, Baccalaureate Degrees in the Radiation Sciences
Director, Nuclear Medicine Technology Education
Department of Radiology, 3834 JPP

Jay Smith, BSRS, CNMT, ARRT, RT(R)(N)
Radiation Sciences Educator

Related information

Low Level Waste Repository — Management and Operations

LLW Repository Ltd is a waste management company that provides services to customers to treat and dispose of low level radioactive waste in the UK, based in West Cumbria.

Waste Management Optimization

The UK’s National Waste Programme was developed by LLWR, using Studsvik expertise, to provide an integrated approach to managing the UK’s radioactive waste. It has transformed the way low-level radioactive waste is managed across the nuclear idustry, and seen substantial benefits delivered to the UK tax payer. The programme seeks to divert waste from disposal in the LLWR by implementing the waste hierarchy through provision of waste treatment services, coordinate development programs to minimize duplicated costs, tackle difficult wastes to ensure a disposal route is identified and share knowledge across the industry to drive collaboration and increase confidence in program delivery.

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R&D activities

BetaShape – Beta spectra computing – Version: 2.0 (15/10/2019)

The BetaShape program has been developed to improve nuclear data related to beta emission and electron capture properties. Use of the code, with options, and improvements over version 1 are briefly described in the README.txt file.

Beta Transitions
Mean energies, log (ft) values, beta and neutrino spectra for single and multiple transitions are provided. A database of experimental shape factors is included and has been updated. The uncertainties provided by the input parameters are taken into account and propagated.

Electron captures
Capture probabilities and capture-to-beta-plus ratios are provided for each atomic subshell. The log(ft) value of each transition is calculated. For a given branch, the splitting between capture and beta plus transitions is also determined.

The spectra and capture probabilities pre-calculated with BetaShape are available on the atomic and nuclear data page, in the column ‘ASCII files’, by clicking on the ‘B’ button for the desired nuclide.

– X. Mougeot, Physical Review C 91, 055504; Erratum Phys. Rev. C 92, 059902 (2015)
DOI : https://doi.org/10.1103/PhysRevC.92.059902
– X. Mougeot, Applied Radiation and Isotopes 154 (2019) 108884
DOI : https://doi.org/10.1016/j.apradiso.2019.108884

Download BetaShape:


The detailed processing of gamma and X-ray spectra requires determining the areas of the total absorption peaks. This determination is easy for isolated peaks on a constant background, but this is not the case in spectrum regions where peaks are superimposed and/or on a variable background, and specific tools need to be implemented. The COLEGRAM software makes it possible to adjust different functions at the experimental points of a spectrum. The visualization of the calculated and experimental points as well as the residuals allows to follow the evolution of the adjustment and the quality of the results.

If you have any questions about COLEGRAM, please contact us via the form below.

ETNA (Efficiency Transfer for Nuclide Activity measurements) has two gamma-ray spectrometry utilities that can be used to calculate:
– the efficiency transfer factor in the case of a change in geometric conditions between efficiency calibration and sample measurement,
– corrective factors for the effects of true coincidences, related to the decay scheme of radionuclides with gamma cascade emissions.

If you have any questions about ETNA, please contact us using the form below.


More specifically dedicated to users of alpha and gamma spectrometry, the NUCLÉIDE-LARA application makes it possible to consult and perform queries on the decay data for more than 400 radionuclides (half-life, decay mode, emission energy and intensity, decay scheme…).

The application can be found at the following address:

If you have any questions about NUCLÉIDE-LARA, please contact us using the form below.


Metrology of X fundamental parameters

In order to ensure the quality of the quantitative results by X-ray analysis techniques, measurements of atomic parameters (attenuation coefficients, fluorescence yields) are carried out for the elements of interest. The laboratory’s experimental results concerning attenuation coefficients can be consulted thanks to the MACAO tool, available on the following site:

If you have any questions about MACAO, please contact us using the form below.

PUFI (PENELOPE User-Friendly Interface) is a convenient interface designed to facilitate the preparation of PENELOPE geometry files for application to gamma-ray spectrometry. The software considers typical cases with a cylindrical geometry including detector, volume source and shielding.

Download PUFI:

If you have any questions about PUFI, please contact us via the form below.

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