Iridium-192 has a half-life of approximately 73.83 days. If a source measures 100 Ci today, what will its activity be after one half-life?
Asnt Irrsp Radiation Physics
Question · Easy
Which isotope has the longest half-life among common industrial radiography sources?
Spontaneous change of one radioisotope into another, releasing radiation and lowering the parent material's activity.
Physics fundamentals
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Chapter 1: Radiation Physics & Radioactive Decay
1.1 Atomic Structure, Radioactivity & Decay Modes
Study guide
What is the predominant mode of radioactive decay for Iridium-192?
Question · Medium
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Cobalt-60 emits two principal gamma photons. What are their approximate energies?
High-energy, short-wavelength electromagnetic radiation emitted from the nucleus of an atom.
Selenium-75 is typically chosen over Iridium-192 for radiography of which material range?
Cesium-137 effectively emits a single gamma photon at what approximate energy?
Unit equal to 37 billion disintegrations per second.
1.2 Radioactive Decay Kinetics & Half-Life Calculations
An Ir-192 source decays from 100 Ci through three half-lives. What is the remaining activity?
Swap tiles to line up three of the same term.
Term Match
What fundamental difference distinguishes X-rays from gamma rays of the same energy?
Charged particle emitted from an unstable nucleus that is identical to an electron when negative.
In an X-ray tube, what primarily controls the maximum energy of the emitted X-ray spectrum?
Which interaction dominates when low-energy photons (below about 100 keV) interact with high atomic number materials such as lead?
Traditional unit of dose equivalent, equal to the absorbed dose in rads multiplied by the radiation's quality factor.
Dosimetry and effects
1.3 Primary Industrial Radiography Isotopes (Ir-192, Co-60, Se-75, Cs-137)
Which photon interaction process dominates at the intermediate gamma energies used by Ir-192 (roughly 100 keV to 1 MeV) in light materials?
Flip two cards at a time to find matching terms.
Term Pairs
Pair production cannot occur unless the incoming photon energy exceeds what threshold?
Question · Hard
Unit of absorbed energy equal to 100 ergs per gram.
Why is the Ir-192 gamma spectrum described as 'complex' rather than a single line?
What term describes the number of disintegrations per second occurring in a radioactive source?
SI unit of absorbed energy equal to one joule per kilogram.
1.4 Industrial X-Ray Production & Machine Sources
One curie (Ci) equals how many becquerels?
Find five hidden terms in a grid of letters.
Term Search
A 50 Ci Ir-192 source is delivered. If it sits unused for one half-life (about 74 days), what is the activity at use?
Principle requiring efforts to keep exposures well below dose limits while the licensed work continues.
Exposure control
Co-60 is preferred over Ir-192 for radiography of very thick steel because of what property?
A radioactive isotope that decays from 80 Ci to 5 Ci has experienced how many half-lives?
Material or obstruction placed between a source and people to absorb radiation.
Chapter 2: Radiation Interactions & Biological Effects
2.1 Photon Interaction Mechanisms with Matter
What unit measures absorbed dose in the SI system, and how does it relate to the older 'rad'?
Asnt Irrsp Dosimetry Biological
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The sievert (Sv) relates to the rem how?
One of three basic controls on exposure, exercised by limiting how long a radiographer stays near a source.
Per 10 CFR 20.1201, what is the annual occupational limit for total effective dose equivalent (TEDE) to an adult worker?
Per 10 CFR 20.1201, what is the annual shallow-dose equivalent (extremity) limit?
Alternative to 'radiographic exposure device' for the projector-type instrument that holds a sealed source and moves it from a shielded to an unshielded position for an exposure.
Equipment
2.2 Radiation Measurement Units & Quantities
What is the annual lens-of-the-eye dose equivalent limit under 10 CFR 20.1201?
Under 10 CFR 20.1208, the dose to an embryo or fetus during the entire pregnancy of a declared pregnant worker is limited to what value?
Kind of tube, flexible or rigid and often J-shaped, that carries a source assembly and control cable to the exposure head.
What is the annual public dose limit under 10 CFR 20.1301 from a licensed operation?
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