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RADON EXAM STUDY GUIDE
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RADON EXAM STUDY GUIDE
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RADON EXAM STUDY GUIDENucleus of an atom - Answers -Contains one or more positively charged protons and
uncharged neutrons
Number of protons - Answers -Atomic number of an element reflects the....
Mass = - Answers -Number of protons and neutrons
Radon 222 (mass #) - Answers -86 protons (atomic number) and 136 neutrons
Ion - Answers -Atom that either lost or gained electrons
Radon - Answers -Major source is from soil
Produced by natural decay of radium
Gas that moves easily through small spaces
Half life 3.8 days
(Gas, inert, no static electrical charge)
Radium - Answers -A decay product of uranium found in rock and soil
- U238 --> R226 --> Rn222
Half life - Answers -Half of radon in a sealed volume will decay in 3.8 days, half of the
remainder in the next 3.8 days etc.
Thorium 232 --> radon 220 - Answers -Half life of 55 seconds, therefore is less
important than radon 222 exposure
Measurement 4-6 days in duration - Answers -Closed building conditions SHOULD be
achieved at least 12 hours prior to measurement and SHALL be maintained during test.
During test... - Answers -Operate heat and cooling systems normally
Operate heat recovery ventilator if it has been maintained and continuously operated
Mitigation system in operation
Passive (time-integrating) Radon Measurement Devices - Answers -- Activated
Charcoal Adsorption (open face & diffusion barrier)
- Charcoal liquid Scintillation
- Alpha Track Detector (long-term)
- Electret Ion Chamber (affected by gamma radiation)
Grab radon monitor - Answers -Scintillation cell & photomultiplier tube
Continuous Radon Monitor (CRM) - Answers -- Scintillation Cell & Photomultiplier Tube
- Pulse Ion Chamber
, - Solid State Silicone Chip
Quality Control - Answers -Measurements made for purpose of assessing and
monitoring data quality
Quality assurance plan (QAP) - Answers -Includes quality control measures to assure
that things are being done correctly and in a timely manner.
- Record keeping
- Assign responsibilities
- Guidelines (control charts)
- Regular inspections
Duplicates - Answers -Measurements that provide a check on the precision of
measurements
Measure PRECISION
10% precision
Evaluation of precision of duplicates is made by calculating Relative Percent
Differences (RPD)
Blanks (control) measurements - Answers -Only done for passive time integrating
devices
Measure BACKGROUND
5%
Spike Measurements - Answers -Spikes are only conducted for the passive time
integrating measurement devices
Determine sample loss during transport
Measurements exposed to a known amount of radon
Measure ACCURACY
3%
(3 measurements conducted for each 100 measurements)
Calibration Measurement - Answers -Calibration is used for all continuous and grab
sampling devices as well as labs
Devices must be recalibrate at least once every 12 months (year)
Routine Instrument Performance Checks - Answers -How well equipment is operating
Check source
Documentation - Answers -Record keeping, assign responsibility, guidelines, and
regular inspection
Case A - Answers -BETTER
Over course of year 333 spikes (more throughout year)
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