Alpha & Heavy Ions alpha_flux_dose_calc
Alpha Surface Contamination Flux & Skin Dose
Evaluates planar 2π surface alpha contamination emission, air standoff attenuation cutoff, detector mylar window transmission, and shallow tissue basal dose.
Φ(d) = 0.5 × A_s × f_self × max(0, 1 − d / R_air)
RADCALC HEALTH PHYSICS & NUCLEAR ENGINEERING WORKSHEET
Alpha Surface Contamination Flux & Skin Dose (Alpha Flux & Dose)
Domain: Alpha Particle Dosimetry & Recoil · Tool ID:
alpha_flux_dose_calc · Engine: 100% Local Browser WASM Φ(d) = 0.5 × A_s × f_self × max(0, 1 − d / R_air)
Operational Notes:
Guided Stepper Workflow All Input Parameters & Solver
1
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2
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All Parameters Entered
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Solved Output Live WASM Readout
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Entered Input Parameters (Tap any row to edit)
Calculated Result & Visual Analysis
Nominal Solved Value Updated automatically
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CLIENT-SIDE 3D SIMULATION Alpha Surface Contamination Flux & Skin Dose 3D Transport Field
Interactive 3D Geometry & Particle Transport
WebGPU / WebGL2 Ready
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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 alpha_flux_dose_calc
1. Input & Solved Parameter Ledger
| Role | Symbol | Parameter Name | Entered / Display Value | Normalized Base Unit | Definition |
|---|
2. Charged-Particle Stopping & Shallow Dose Hp(0.07)
Governing Equation & Parameters
Flux (particles/cm²·s) = 0.5 × Surface Activity (Bq/cm²) × Self-Absorption × (1 − Standoff / Air Range)
| Symbol | Parameter | Default Unit | Definition |
|---|---|---|---|
| A_s | Surface Activity Density | Bq/cm2 | Total alpha radioactivity per unit surface area in Bq/cm². |
| d | Detector Standoff Distance | cm | Air gap distance between contaminated surface and detector window in cm. |
| E_α | Alpha Emission Energy | mev | Alpha particle emission energy in Mega-electronvolts. |
| f_self | Source Self-Absorption Factor | fraction | Transmission fraction through surface contamination residue (0.1 to 1.0). |
| t_win | Mylar Window Areal Density | mg/cm2 | Detector entrance window areal density in mg/cm² (typically 1.4–2.0 mg/cm²). |
| Φ | Alpha Particle Flux | particles/(cm2*s) | Calculated alpha particle fluence rate in particles/(cm²·s). |
| Ḣ | Shallow Basal Dose Rate | mSv/hr | Equivalent dose rate delivered to living basal tissue layer in mSv/hr. |
Health Physics Notes & Related Calculators
Operational Guidance & Physics Assumptions
- In 2π forward geometry, a thin planar source emits 50% of disintegrations into the forward hemisphere.
- Self-absorption in dust, oil, or thick contamination layers significantly reduces emitted alpha flux (typical f_self = 0.85–0.95 for thin smears, <0.5 for thick soil/sludge).
- When standoff distance d exceeds R_air, the air acts as a complete barrier and measured alpha flux drops sharply to zero.
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