Presentation on theme: "Radon in Your Home Presenter information here 4/2014."— Presentation transcript:
Radon in Your Home Presenter information here 4/2014
Learning Objectives Knowledge: Origin of Radon & Health Risk. Comprehension: Influences of radon entry into homes. Application: Options for testing and mitigation.
A Citizen's Guide to Radon: The Guide to Protecting Yourself and Your Family from Radon
Naturally occurring Radioactive gas Colorless Odorless “ Radon What Is It?
Radon 3.8 days Radium 1,620 years Uranium 4.47 million years Lead Polonium Bismuth Radon – radioactive gas
Radon Measurement Radon is measured in picoCuries per liter of air (pCi/L). While no level of radon exposure is considered safe, EPA has set an action level at 4 pCi/L 1 picoCurie is equal to 0.037 radioactive disintegrations per second According to EPA, if levels are at or above 4 pCi/L, the home should be mitigated take precautionary actions between 2-4 pCi/L
Radon is the leading cause of lung cancer among non-smokers claiming approximately 21,000 lives annually. Radon Health Concern
Inhalation of Radon Decay Products AlphaParticle Radiation Damage to DNA Radon Causes Lung Cancer
Radon - A Physician's Guide: The Health Threat With A Simple Solution
Radon and Children Children have smaller lungs and therefore higher breathing rates. Children spend up to 70% more time indoors than adults on average. According to the U.S. EPA, 1 in 5 schools has at least one schoolroom with a radon level that exceeds the recommended level of 4 picoCuries per liter (pCi/L) or higher. Children are more susceptible to effects of radon.
Radon in soil and rocks under and adjacent to buildings, migrates through foundations, cracks and small openings and concentrates inside buildings. Well Water Building Materials
Testing is the only way to know the radon level of a building. Residential Construction Team
short-term/charcoal 3-7 day test long-term/alpha track 3 months to a year test DIY Radon Test Kits
DIY Testing - FOLLOW INSTRUCTIONS Kit Instructions Vary – follow instructions! 12-hour closed-house for 2-7 day test Place in Lowest “lived-in” area Place midlevel from floor & ceiling Out of air flow (ductwork and fans) Out of kitchen and bathroom
Consumer's Guide to Radon Reduction: How to Fix Your Home 23
Radon Mitigation Sub-slab Depressurization n Most common type of radon mitigation system n Suction created by fan draws radon from beneath the concrete slab and safely vents radon outdoors Fan Attic Depressurization Piping System Discharge
Crawlspace Mitigation … Sub-Membrane Depressurization System Fan Attic Depressurization Piping System Discharge
Building Radon Out: A Step-by-Step Guide on How to Build Radon- Resistant Homes
Building Radon Resistant Homes Pre-construction testing is costly and is not 100% - not recommend Homes can be built to prevent radon entry. Radon-resistant construction includes common building practices and a few added steps. Radon-resistant features into your new home adds $350-$500 vs. $1,500-$3,000 for existing home. Homes with radon-resistant features should be tested for radon after occupancy.
Radon Resistant Construction Minimum Rough-In Features 4” layer of gas-permeable material (1/4”-2” aggregate) under all concrete slabs and other floor systems in contact with ground; Soil gas retarder (6 mil poly) under slab or on ground if crawl space Minimizing entry routes (sumps, floor openings, etc.) Passive sub-membrane/slab depressurization system 3-inch diameter PVC pipe embedded vertically in the sub-membrane/slab extending up through the house and terminating about the roof surface Provisions for a vent pipe power source
Radon in Water Radon gas contribution from water – 5% - always focus on radon in air first! 10,000 pCi/L in water adds 1 pCi/L to air Private wells are greatest problem Water outgases radon – more from hot H2O