Radiation Lab
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Radiation tools that show their work.

Three pro workbenches for reference X-ray and gamma fields, survey-meter type testing and radionuclide chemistry, and eight quick calculators for dose, shielding, decay and detection limits. Each tool names the standard or model and the data it works from, and shows its working.

Pro workbenches

  • Radiation Field Pro in the browser with the N-80 beam quality loaded: the filtered tungsten spectrum at 80 kV with the mean and effective energies marked, and below it the beam-quality results — mean energy 64.96 keV, effective energy 63.95 keV, first half-value layer 0.5753 mm of copper, second 0.6185 mm and homogeneity coefficient 0.930.

    ISO 4037 reference fields

    Field Pro

    Spectrum, half-value layers, Hp(10) and a GUM uncertainty budget, for calibration laboratories setting up reference beams.

    Open Field Propro.radiation-lab.com

  • Isometric drawing of an instrument test room: a shielded irradiator with collimator on the left, a radiation protection instrument under test on an XYZ positioning stage with a graduated rotary table on a long rail, and the control station outside the room on the right.

    IEC 60846-1 type tests

    RadiMeter

    Linearity, energy, angular and dose-rate response with a worksheet record, for test laboratories and instrument makers.

    Open RadiMeterGoogle sign-in to run tests

  • The M-Phreefiteq calculator after running its “Se-79 · oxidizing groundwater” example: the verified examples on the left, and on the right the equilibrium state — pH 7.00, pe 4.00, ionic strength 0.01024 mol/kgw, charge balance error 0.00% — with a summary saying the iron oxides tend to precipitate while the selenium minerals stay dissolved.

    PHREEQC speciation & transport

    M-Phreefiteq

    Speciation, sorption fitting and 1D transport of radionuclides, for researchers and disposal-safety analysts.

    Open M-Phreefiteqdisposal.radiation-lab.com

Quick calculators

8 calculators that run in your browser, drawing on 147 nuclides, with 7 validation reports

How every number is checked

  • Computed from open data. Gamma constants are summed line by line from IAEA evaluated decay data and NIST attenuation coefficients — eight materials, air to lead, from 1 keV to 20 MeV — rather than copied from a handbook, so the lines and the cut-off behind a result can be seen and moved.

  • Worked by hand. 7 of the 8 calculators have a validation report that works the case from published values and sets the tool’s result beside it. Field Pro compares its first half-value layer with all 50 ISO 4037-1 beam qualities, and M-Phreefiteq runs the USGS PHREEQC engine with verified examples you can rerun.

  • Written down. For the calculators, models, data sources and limits are on the methods page and the reports on the validation page; each workbench sets out its own methods and checks on its site.

Nuclide data

147 nuclides in one dataset: 96 emit photons and 45 only beta or alpha radiation, the pure emitters that dominate waste characterisation. 72 have a reference sheet: half-life and specific activity, the emission lines with each line’s share of the dose rate and, for the photon emitters, half- and tenth-value layers solved for the whole spectrum. Each sheet opens the calculators with that nuclide already chosen.

Browse nuclides

Who it is for

Calibration and test laboratories
Set up and check ISO 4037 reference fields in Field Pro, and run survey-meter type tests in RadiMeter.
Radiation protection officers and technicians
Check a dose rate, a shield, a stay time or a detection limit before the job, with the quick calculators.
Researchers and students
Work through radionuclide speciation, sorption and transport in M-Phreefiteq, or a decay problem with the data in view.

Recently updated

Longer notes

Questions the calculators raise but cannot answer inside a form, each worked through with the data in view.

Ask a question, or tell us a number is wrong

Send the page address, what you entered and the value you expected with its source. A reproducible calculation error is fixed first.

Send feedback

Questions people ask first

Do I need an account?

Not to calculate. The calculators, Field Pro and M-Phreefiteq run without one. RadiMeter asks for a Google sign-in before its test workbench opens, because it keeps your test records; its standards and guides stay open. Elsewhere, signing in only keeps what you choose to save.

Is it free?

Yes. There is no paid tier and nothing to install. The site is funded by the person who writes it; advertising may carry the running cost in future, and if it does the privacy policy will say so first.

Can I use a result in a report or a licensing submission?

A result is yours to use, and yours to answer for. Radiation Lab is not an accredited calibration or testing laboratory, and nothing here replaces accredited calibration, testing or a licensed safety assessment. When a result goes into a report, name the tool, the standard or model it implements and its data sources, which each tool states on its methods or about page, so a reviewer can see exactly what was done.

I think a number is wrong. What should I do?

Say so. Send the page address, what you entered and the value you expected with its source through the contact page. A reproducible calculation error is fixed first.

Radiation Lab is not an accredited calibration or testing laboratory. These tools do not replace accredited calibration, testing, or a licensed safety assessment.

Built by one person who works in the radiation field at a non-profit organisation — a personal project, carrying no institutional endorsement. What this project is, and is not