Exam (elaborations)
(CIH) Radiation Questions and Answers 2024
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Exam of 9 pages for the course CIH at CIH ((CIH) Radiation)
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(CIH) RadiationIonizing Radiation Definition - answer Particles (photons) w suff energy to remove
electrons (ionize)
Electro Magnetic Radiation Spectrum - Related - answerSub-Radio Frequency
Radiofrequency
Microwave
Infrared C-B-A
Light (visible)
UV A-B-C
Ionizing - X-Ray
Wavelength < moving right
Frequency > moving right
Natural Radiation - answerRadon
Cosmic Radiation
Man-made Radiation - answerDiagnostic X-Ray
Nuclear Med
Consumer products - Granite, Fire Detector,
Occ Radiation Sources - answerDensity or Point level Gauges
NDT testing
X-ray - medical and welding (plasma-arc)
Nuclear Med
Nuclear energy
Laboratory
XRF use
Types of Ionizing Radiation - answerAlpha - Particle
Beta - Particle
Gamma - beam
Other - neutrons, protons, neutral mesons
X-ray vs Gamma Energy - answerenergy comes from electron vs energy comes from
neutron
Alpha Description - answerHelium nucleus (2P, 2N)
-Large
-Stopped by outer layers of skin
, -serious damage internal
-QF 20
Alpha emitted from atom what happens? - answer-He nucleus
-<2 P & <2N
-Atm# <2
-At Wt<4
Beta - answerHigh Speed Electron
Smaller
Radioisotopes used as tracers - H-3, C-14, Sr-90
QF 1
Energy few eV - 2.24 MeV
Higher energy more penetrating
SR-90 1.1cm
Alpha emitted from atom what happens? - answerNeutron > Proton > Electron shoots
off
Atm # >1
Atm Weight - stays same
Gamma - answer-Electromag Radiation
Continue through medium until they have chance to encounter an atom
-few eV to Billion eV
Radiation Activity - answerSpont decay
decay/time
disintegrations per second
decays expoentially
downward slope curve (half life)
1 Becquerel - answer1 disintegration/second (rarely used)
1 Curie - answer3.7 x 10^10 disintegrations per second
(on equation sheet)
Radiation Activity - Half Life - answerTime when 1/2 material has decayed
Activity Level Equation
A
Ai
t
T1/2 - answerA - activity level after time
Ai - initial acitivity
t - time
T1/2 - half life
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