About Radiation Lab
A working radiation protection engineer got tired of re-deriving the same numbers in a spreadsheet that nobody else could check. Radiation Lab is what those spreadsheets became: tools that name the standard or the model they implement, run in the browser with nothing to install, and show the assumption behind every figure.
Who writes this
Radiation Lab is built and maintained by one person, who works in the radiation field at a non-profit organisation. It is a personal project, built outside that work and funded by its author, with advertising intended to carry the running cost in future: it is not published by that organisation, carries no institutional endorsement, and the organisation is not responsible for anything here. It is not affiliated with, endorsed by, or sponsored by the IEC, the IAEA, NIST, any regulator, or any instrument manufacturer.
The laboratories
| RadCalc | Dose assessment and shielding — point-source dose rate with attenuation and buildup, beta range and bremsstrahlung, detection limits, decay, specific activity and stay time. Gamma constants are computed line by line from evaluated decay data and NIST mass energy-absorption coefficients rather than copied from a table, and a reference page for each of roughly 150 nuclides shows the result of that computation. |
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| RadiMeter | Instrument metrology — how the characteristic tests of the IEC TC 45 / SC 45B standards are actually run: energy and angular response, linearity, statistical fluctuation, response time, alarm accuracy. Each test page describes the measured quantities, the test points, the acceptance criterion and the failure patterns, and the worksheet keeps the record. |
| M-Phreefiteq | Radionuclide transport and geochemistry — equilibrium and kinetic modelling on a PHREEQC engine, sorption fitting, and one-dimensional transport with decay chains. Written in Korean. |
How the numbers are produced
Three rules hold across the site. Constants are computed from open data rather than quoted, so the chain from source to result stays visible. Every calculator has a methods page that states the equations, the data source and the range of validity. And a set of validation pages compares the output against worked examples and published values, so a reader can see where the tool has been checked and where it has not.
What it is not
It is not a substitute for measurement, for a qualified professional's judgement, or for the standards themselves. Read the terms of use for the full statement.
Corrections
If a number here is wrong, that is worth knowing and worth fixing. Send the page, the input and the value you expected to contact@radiation-lab.com.