About this estimator
This page provides a simple, client-side estimate of photon dose-rate using an approximate formula and sparse lookup tables. It is intended for educational and demonstrative purposes only.
Limitations
- Uses illustrative μ and μa/ρ tables — not comprehensive. For accurate work use NIST/XCOM.
- Buildup factors are approximated and sparsely tabulated; results can be off significantly for complex geometries.
- Not suitable for safety-critical or regulatory calculations.
How to use
- Enter source strength (photons per second), photon energy (MeV), shield thickness (cm), and distance (m).
- Select shield material and approximate source geometry.
- Press Calculate — results appear below with a brief breakdown of intermediate values.