Proton beam flux and dose rate
Beam current → flux (p/cm²/s) → ionizing dose rate (rad/s, krad/min) in a silicon target. Enter the beam energy and current, or the flux you want, and the beam area, and read the time to your target dose and the total dose for a fluence.
Beam
Beam area
LET data source
Paste LET vs energy table
Whitespace, comma, tab, or semicolon separated. First column = MeV, second column = MeV·cm²/g (electronic stopping power; PSTAR's total column differs by under 0.1 percent above 1 MeV). Log-log interpolation between points.Time to target dose
Fluence → total dose
Results
LET vs energy
Quick reference table (active beam & LET source)
| E (MeV) | LET (MeV·cm²/g) | LET (keV/µm) | Flux for 1 krad/min (p·cm⁻²·s⁻¹) |
Beam current for 1 krad/min (across active area) |
|---|
How it works
Converting beam current to dose rate
Current to flux
The beam current divided by the proton charge is the number of protons per second, and spread over the beam area it is the flux. In flux mode the same relation runs backward to the current the beam needs.
LET in silicon
The mass stopping power at the beam energy comes from Bethe–Bloch with the Sternheimer density correction, or from the facility or PSTAR table you paste, interpolated log-log.
Flux times LET is the dose rate
Flux times LET, times 1.602×10-8 rad per MeV/g, is the dose rate in silicon. It sets the time to your target dose, and a fluence times the LET gives the total dose.
How the numbers are computed
Flux: φ = (I / e) / A with e = 1.602×10⁻¹⁹ C.
Dose rate (rad/s): Ḋ = φ · LET · 1.602×10⁻⁸ with LET in MeV·cm²/g (1 MeV/g = 1.602×10⁻⁸ rad).
Linear LET: (MeV/cm) = LET·ρ with ρSi = 2.33 g/cm³.
Bethe–Bloch (Si): PDG form with Sternheimer density correction (Si: I=173 eV, x₀=0.2014, x₁=2.8715, a=0.1492, m=3.255, C̄=4.4355).
Disclaimer
This tool is provided as a free community resource. Results should be verified independently. See Help & Reference