Radon PowerPoint Presentation

Radon PowerPoint Presentation

2017-05-30 117K 117 0 0

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Indoor Air Quality in Tribal Communities. Institute for Tribal Environmental Professionals. nau.edu. /iaqtc. 1. Radon. Where does Radon come from. What is Radon. Radioactive . Decay. Risk of Exposure. ID: 554187

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Presentations text content in Radon

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Radon

Indoor Air Quality in Tribal CommunitiesInstitute for Tribal Environmental Professionals

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Radon

Where does Radon come fromWhat is RadonRadioactive DecayRisk of ExposureRadon TestingEducation and OutreachRadon MitigationRadon-Resistant Construction

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Where

does radon come from?

Caused by breakdown of Uranium in earth’s crust Amount of radon in soil depends on soil chemistry, which varies greatly from one house to nextMoves up through ground into atmosphere, where it can enter through cracks/holes in foundation

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Most mitigation systems are known as “active soil depressurization” and attempt to prevent the radon from entering the home

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Radon in Buildings

From soilLower parts of building at greatest risk“Stack effect”

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Radon

Radon in air is ubiquitous Radon: odorless, colorless, radioactive gasFound in outdoor air and indoor air of buildings  Form of radiation that damages lung tissue# 1 cause of lung cancer among non-smokersEstimated 21,000 deaths year, risingSmoking increases your risk 4 times!Elevated indoor levels found in every state

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Radon Comes from Uranium

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Radon Decay Products

Lead-210

Polonium-214

Bismuth-214

Lead-214

Polonium-218

Radon-222

b,g

a,g

a,g

a,g

b,g

Lead-206

Polonium-210

Bismuth-210

b,g

a,g

b,g

22 yrs

4 day

3 min

27 min

20 min

0.2 ms

5 day

138 day

Stable

Po-218 and Po-214

Deliver majority of radiation dose to lungs

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Radon in Lungs

Radon or decay products inhaledParticles irradiate lungsIrradiation can cause lung cancer

Radon

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Radon Levels

Red alert - above 4 pCi/L Yellow alert - between 2 pCi/L and 4 pCi/L Average indoor radon is about 1.3 pCi/L

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Radon Testing

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Initial Test: 2-7 days

Non-real

estate: Lowest lived inReal estate: Lowest suitable for occupancy w/o renovation

NO

YES

YES

Test in livable and frequently occupied room

Keep away from drafts and moisture. No bathrooms, kitchen, crawlspace

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Location of Device in Room

In a room with low traffic, where it will not be disturbedAway from draftsAway from extreme heat and areas of high humidity Avoid direct sunlightAt least 20 inches from floor

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Location of Device in Room

If device is hung, suspend 6 to 8 feet from floorMore than 3 feet from exterior doors, windows, or other openings to outside12 inches or more from an exterior wallAt least 4 inches from other objects (including another test device)

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Activated Charcoal Devices

Advantages

Disadvantages

Compact, convenient and economicalCan be used for 48-hour testCan be easily mailed to lab for analysisPassive, does not require power and silentQuick and accurate analysis

Limited to short-term samplingProvides no indication of changes in radon during measurement.If radon peaks and valleys are dramatic, the results validity is questioned because of a possible bias over the last 12 hours.Tampering detection difficult.

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Do It Yourself Test Kits

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Radon Mitigation

 

                                 

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One way to ensure that your home is safe from radon

Ambient outdoor radon levels average 0.4 pCi/L

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Basic Radon Mitigation

The cost of radon mitigation is between $800 and $2,500, average about $1,200

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Mitigation in Crawlspace

Active soil depressurization. Notice the piping under the plastic

Pipe to fan

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Summary

Most common type of mitigation is active soil depressurization

No “one system fits all” approach to radon mitigation; care should be taken to install the right system for each unique circumstanceAnnual inspection of mitigation system should be completed

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Radon Resistant Construction (RRC)

Radon-resistant construction typically costs builder between $250 and $750RRC could cost less than $250 if builder already uses some of same techniques for moisture control For builder, much less expensive to install a radon-resistant system during construction than to fix a radon problem identified laterIf a new homeowner tests for radon and has to mitigate high levels, could cost builder or owner as much as $2,500 www.epa.gov/radon/rrnc/index.html

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