Space RHA — Proton Dose & Flux Calculator — Silicon Target

Beam current → flux (p/cm²/s) → ionizing dose rate (rad/s, krad/min). Bethe–Bloch LET with optional facility-table override.

Help & Reference

Inputs

Proton kinetic energy

Input mode

Specify current → flux Specify flux → current

Beam current

Facility

Beam shape

Beam diameter

LET data source

Bethe–Bloch (computed) Custom table

Bethe–Bloch with density correction is accurate above ~20 MeV. Below that, paste your facility / NIST PSTAR data here.

Paste LET vs energy table

Whitespace, comma, tab, or semicolon separated. First column = MeV, second column = MeV·cm²/g (total stopping power). Log-log interpolation between points.

Time to target dose

Target dose

Required time

—

Fluence → total dose

Target fluence

Total dose

—rad

Total dose

—krad

Total dose (SI)

—Gy

Time at current flux

—

Results

Particle Flux

—p·cm⁻²·s⁻¹

Beam current (derived)

—p/s

LET in Si

—MeV·cm²/g

LET (linear)

—keV/µm

Dose rate

—rad/s

Dose rate

—krad/min

Dose rate (SI)

—Gy/s

Source mode

—

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 ρ_Si = 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).

LET vs energy

Solid line: active LET source. Dot marks the current 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)