Neutron & Activation neutron_dose_calc
Neutron Fluence-to-Dose Equivalent (ICRP 74)
Converts thermal, epithermal, fast, and fusion neutron flux to ambient dose equivalent rate H*(10) and mrem/hr using ICRP 74 and NCRP 112 conversion coefficients.
Ḣ*(10) = Φ × h_Φ*(10, E_n) × 3.6 × 10⁻⁶ mSv/hr
RADCALC HEALTH PHYSICS & NUCLEAR ENGINEERING WORKSHEET
Neutron Fluence-to-Dose Equivalent (ICRP 74) (Neutron Dose Rate)
Domain: Neutron Shielding & Activation · Tool ID:
neutron_dose_calc · Engine: 100% Local Browser WASM Ḣ*(10) = Φ × h_Φ*(10, E_n) × 3.6 × 10⁻⁶ mSv/hr
Operational Notes:
Guided Stepper Workflow All Input Parameters & Solver
1
What do you want to calculate?
Select your target output variable. The stepper will guide you through only the required inputs.
2
Start from a Field Scenario Preset (Optional)
Pre-fill realistic health physics values, then refine individual parameters or jump straight to the result.
All Parameters Entered
Review Inputs & Calculated Result
Solved Output Live WASM Readout
-- --
Entered Input Parameters (Tap any row to edit)
Calculated Result & Visual Analysis
Nominal Solved Value Updated automatically
--
--
Enter parameters on the left to calculate.
CLIENT-SIDE 3D SIMULATION Neutron Fluence-to-Dose Equivalent (ICRP 74) 3D Transport Field
Interactive 3D Geometry & Particle Transport
WebGPU / WebGL2 Ready
3D Hardware Acceleration & Browser Compatibility Status Inspect Requirements ↓
Checking Browser 3D Capabilities… Probing WebGPU adapter, WebGL 2.0, and WebGL 1.0 contexts locally.
Geometry & Field Diagram
Interactive Model
Sensitivity Curve
Normalized Base-Unit & WebMCP Tool Payload neutron_dose_calc
1. Input & Solved Parameter Ledger
| Role | Symbol | Parameter Name | Entered / Display Value | Normalized Base Unit | Definition |
|---|
2. Neutron Physics & Activation Schedule
Governing Equation & Parameters
Ambient Dose Rate (mSv/hr) = Neutron Flux (n/cm²·s) × Fluence-to-Dose Coefficient (pSv·cm²) × 3.6 × 10⁻⁶
| Symbol | Parameter | Default Unit | Definition |
|---|---|---|---|
| Φ | Neutron Fluence Rate | n/(cm2*s) | Total neutron fluence rate (flux) in neutrons per cm² per second. |
| h_Φ* | Fluence-to-Dose Coefficient | pSv*cm2 | ICRP 74 ambient dose equivalent conversion coefficient in pSv·cm². |
| E_n | Neutron Energy | mev | Neutron kinetic energy in Mega-electronvolts. |
| Ḣ*(10) | Ambient Dose Equivalent Rate | mSv/hr | Calculated ambient dose equivalent rate in millisieverts per hour. |
Health Physics Notes & Related Calculators
Operational Guidance & Physics Assumptions
- Neutron radiation weighting factors w_R vary dramatically with energy, peaking at w_R = 20 for fast fission neutrons (0.5–2 MeV) and dropping to 2.5 for thermal neutrons.
- ICRP 74 reference conversion coefficients h_Φ*(10): Thermal (0.025 eV) = 10.6 pSv·cm²; Fast (1 MeV) = 425 pSv·cm²; Fusion (14 MeV) = 540 pSv·cm².
- Fast neutrons deposit dose primarily via elastic proton recoil in tissue, while thermal neutrons deposit dose via (n,γ) radiative capture on Hydrogen and (n,p) capture on Nitrogen-14.
More in Neutron Shielding & Activation (2)
Explore All Other Radiation Domains (25 Calculators) Expand ↓
-- --