Contamination & Internal airborne_dac_calc
Airborne Derived Air Concentration (DAC) & Committed Dose
Converts air particulate filter measurements to air concentration, fraction of DAC, worker DAC-hours, and Committed Effective Dose Equivalent (CEDE) under 10 CFR 20.
f_DAC = C / DAC; CEDE = H_DAC-h × 2.5 mrem/DAC-hr
RADCALC HEALTH PHYSICS & NUCLEAR ENGINEERING WORKSHEET
Airborne Derived Air Concentration (DAC) & Committed Dose (Airborne DAC)
Domain: Contamination, Air Sampling & Internal Dosimetry · Tool ID:
airborne_dac_calc · Engine: 100% Local Browser WASM f_DAC = C / DAC; CEDE = H_DAC-h × 2.5 mrem/DAC-hr
Operational Notes:
Guided Stepper Workflow All Input Parameters & Solver
1
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Select your target output variable. The stepper will guide you through only the required inputs.
2
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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
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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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Enter parameters on the left to calculate.
CLIENT-SIDE 3D SIMULATION Airborne Derived Air Concentration (DAC) & Committed Dose 3D Transport Field
Interactive 3D Geometry & Particle Transport
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Geometry & Field Diagram
Interactive Model
Sensitivity Curve
Normalized Base-Unit & WebMCP Tool Payload airborne_dac_calc
1. Input & Solved Parameter Ledger
| Role | Symbol | Parameter Name | Entered / Display Value | Normalized Base Unit | Definition |
|---|
2. ICRP Internal Dosimetry & Air Sampling Record
Governing Equation & Parameters
Air Concentration = Activity / Volume; DAC Fraction = C / DAC; Committed Dose = DAC-Hours × 2.5 mrem
| Symbol | Parameter | Default Unit | Definition |
|---|---|---|---|
| A_filter | Air Filter Activity | uCi | Radioactivity collected on filter paper in microcuries. |
| Q | Sampler Flow Rate | L/min | Air sampler volumetric flow rate in liters per minute. |
| t_s | Sample Collection Duration | min | Duration of air sample pump operation in minutes. |
| DAC | Radionuclide DAC Limit | uCi/mL | Regulatory Derived Air Concentration limit in µCi/mL (10 CFR 20 Appendix B). |
| t_stay | Worker Exposure Stay Time | hr | Worker occupancy or shift duration in the airborne area in hours. |
| f_ret | Filter Retention Efficiency | fraction | Filter collection and retention efficiency fraction (standard default 1.0). |
| C | Air Activity Concentration | uCi/mL | Calculated atmospheric concentration of radionuclide in µCi/mL. |
| f_DAC | Airborne Concentration in DACs | fraction | Airborne concentration normalized to the DAC limit (C / DAC). |
| H_DAC-h | Accumulated DAC-Hours | DAC-hr | Worker integrated exposure product in DAC-hours. |
| CEDE | Committed Effective Dose Equivalent | mrem | 50-year committed effective dose equivalent delivered to the worker in mrem. |
| V_m3 | Total Sampled Air Volume | m3 | Total air volume sampled through the filter in cubic meters. |
Health Physics Notes & Related Calculators
Operational Guidance & Physics Assumptions
- 1 DAC inhaled for 2,000 hours (1 occupational working year) equals the annual 5 rem (50 mSv) occupational limit: 1 DAC-hour = 2.5 mrem (25 µSv) CEDE.
- 10 CFR 20 Appendix B DAC limits: I-131 = 2×10⁻⁸ µCi/mL; Cs-137 = 6×10⁻⁸ µCi/mL; Co-60 = 1×10⁻⁹ µCi/mL; Pu-239 = 3×10⁻¹² µCi/mL.
- Respirator Assigned Protection Factors (APF): Half-face APR = 10; Full-face APR = 50; PAPR = 1000; SCBA = 10,000.
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