Gas Dilution — Radon Decay Products
Airflow required to dilute a Radon Decay Products source below its exposure limit.
Uranium and some hard-rock mines manage radon in Working Levels, where the control is AIR AGE, not just quantity: decay products grow toward equilibrium over ~40 minutes, so air that transits the workings quickly carries less dose. Series ventilation of multiple stopes is the classic radon mistake.
Formula
Note: Mine ventilation is statutory and life-safety territory: airflow quantities, gas limits and re-entry times must be set by the registered ventilation engineer/manager under your jurisdiction's mining regulations — this calculator is a planning and training aid.
Airflow required to dilute a Radon Decay Products source below its exposure limit. A free mine ventilation & air quality tool — no sign-up, no upload, instant results in your browser.
About Gas Dilution — Radon Decay Products
Gas Dilution — Radon Decay Products computes the governing relationship Q = q_emission / (C_limit − C_background) live as you type. Uranium and some hard-rock mines manage radon in Working Levels, where the control is AIR AGE, not just quantity: decay products grow toward equilibrium over ~40 minutes, so air that transits the workings quickly carries less dose. Series ventilation of multiple stopes is the classic radon mistake. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Gas Dilution — Radon Decay Products
- 1Enter your values — Radon emanation (WL·m³/s equiv), Working Level limit, Background in intake (sensible defaults are pre-filled).
- 2Read the live results: Dilution airflow required.
- 3Check the "with your numbers" line to see Q = q_emission / (C_limit − C_background) substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Gas Dilution — Radon Decay Products?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula Q = q_emission / (C_limit − C_background) with authoritative sources cited on the page (ACGIH — Threshold Limit Values (TLVs); McPherson, M.J., Subsurface Ventilation and Environmental Engineering; MSHA 30 CFR Parts 57/75 — Ventilation standards)
- ✓Uranium and some hard-rock mines manage radon in Working Levels, where the control is AIR AGE, not just quantity: decay products grow toward equilibrium over ~40 minutes, so air that transits the workings quickly carries less dose.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the gas dilution — radon decay products use?+
It evaluates Q = q_emission / (C_limit − C_background), exactly as published. Sources: ACGIH — Threshold Limit Values (TLVs); McPherson, M.J., Subsurface Ventilation and Environmental Engineering; MSHA 30 CFR Parts 57/75 — Ventilation standards. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Uranium and some hard-rock mines manage radon in Working Levels, where the control is AIR AGE, not just quantity: decay products grow toward equilibrium over ~40 minutes, so air that transits the workings quickly carries less dose. Mine ventilation is statutory and life-safety territory: airflow quantities, gas limits and re-entry times must be set by the registered ventilation engineer/manager under your jurisdiction's mining regulations — this calculator is a planning and training aid.
When is this calculator the right tool for the job?+
Airflow required to dilute a Radon Decay Products source below its exposure limit. A free mine ventilation & air quality tool. Series ventilation of multiple stopes is the classic radon mistake. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
Related tools
- Gas Dilution — Carbon Dioxide (CO₂)
- Blast Fume Clearance Time
- Gas Dilution — Diesel Particulate (DPM)
- Gas Dilution — Ammonia (ANFO Wet Holes)
- Oxygen Deficiency Dilution
- Fan Engineering — Fan Air Power & Input
- Fan Engineering — Fan Law — Speed Change
- Paver Speed — Thin Overlay (High Speed)
- Steel Logistics — Oversize Load Planning
Related Manufacturing tools
Spindle Speed Calculator — Aluminum 6061
Carbide starting RPM for milling Aluminum 6061: n = 1000·Vc/(π·D) with a handbook cutting speed preset.
● LiveSpindle Speed Calculator — Mild Steel 1018
Carbide starting RPM for milling Mild Steel 1018: n = 1000·Vc/(π·D) with a handbook cutting speed preset.
● LiveSpindle Speed Calculator — Stainless 304
Carbide starting RPM for milling Stainless 304: n = 1000·Vc/(π·D) with a handbook cutting speed preset.
● Live