Radon Exam UPDATED ACTUAL Questions and CORRECT Answers
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Course
Radon
Institution
Radon
Radon Exam UPDATED ACTUAL
Questions and CORRECT Answers
Nucleus of an atom - CORRECT ANSWER- Contains one or more positively charged
protons and uncharged neutrons
Number of protons - CORRECT ANSWER- Atomic number of an element reflects the....
Mass = - CORRECT ANSWER- Number of protons and ...
Radon Exam UPDATED ACTUAL
Questions and CORRECT Answers
Nucleus of an atom - CORRECT ANSWER- Contains one or more positively charged
protons and uncharged neutrons
Number of protons - CORRECT ANSWER- Atomic number of an element reflects the....
Mass = - CORRECT ANSWER- Number of protons and neutrons
Ion - CORRECT ANSWER- Atom that either lost or gained electrons
Radon - CORRECT ANSWER- 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 - CORRECT ANSWER- A decay product of uranium found in rock and soil
- U238 --> R226 --> Rn222
Half life - CORRECT ANSWER- 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 - CORRECT ANSWER- Half life of 55 seconds, therefore is less
important than radon 222 exposure
Alpha particules - CORRECT ANSWER- Polonium 218 & polonium 214
Greater health risk, damaging DNA molecules of living cells
, Relatively massive but low penetrating power and slow in movement
Gamma Rays - CORRECT ANSWER- High penetrating power and move at speed of light
Level of radioactivity - CORRECT ANSWER- Measured in curies
One picoCurie - CORRECT ANSWER- 1 trillionth of a curie
One pCi/L - CORRECT ANSWER- 2.22 disintegrations per minute/per liter of air
Radon decay products (RDP) - CORRECT ANSWER- Radon decays into a series of
elements and isotopes
- First 4 have a short half-life (30 minutes or less)
- Polonium 218 & polonium 214
- Lead 214 & Bismuth 214
Measured in working levels
(particles, chemically reactive, static electrical charge, major health risk b/c stick to lungs)
Working Level (WL) - CORRECT ANSWER- Concentration of RDPs in air
- Alpha energy released from polonium
Secular equilibrium - CORRECT ANSWER- 4 hours
Quantities of each of the RDPs has reached the same radioactivity as the radon forming them
Equilibrium Ratio (ER) - CORRECT ANSWER- Describes that fraction of radon decay
products that are in the air (measurable) and total RDPs created.
- Equal to .4
Measured RDPs/Total RDPs
High ER = little air movement or a lot of dust/humidity
Low ER = a lot of air movement, air filtering, and little dust/humidity
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