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Chapter: 17.2 / Q: 59
Which of the following body parts is the least sensitive to radiation?
Chapter: 17.2 / Q: 60
The intensity of gamma radiation decreases as the inverse square of the distance. What does this statement mean? If the distance doubles, then the intensity
Chapter: 17.2 / Q: 61
At a distance of one metre, exposure to a particular radionuclide is found to result in an absorbed dose of 12 mGy. If the time of exposure remains constant what will the absorbed dose be at a distance of two metres?
Chapter: 17.2 / Q: 62
Which of the following absorbed radiation dose equivalents would cause the most harm to your body?
Chapter: 17.2 / Q: 63
Of the following, which one would be considered the lowest level for a fatal whole body dose of radiation if received as an acute dose?
Chapter: 17.2 / Q: 64
A caesium 137 source produces an absorbed radiation dose of 400 milligray/ hour at a distance of 1 metre. What would be the dose received at a distance of 5 metres in two and a half hours? (consider the effect of distance first)
Chapter: 17.2 / Q: 65
If a thickness of 7.35 mm of lead can absorb half of the 1 MeV gamma photons that enter the lead, then what fraction of gamma rays will be absorbed by twice this thickness (i.e. 14.7 mm)?
Chapter: 17.2 / Q: 66
The ‘half value layer’ for gamma rays of 0.5 MeV is 0.42 cm of lead. What percentage of the original ray would penetrate four half value layers?
Chapter: 17.2 / Q: 67
Given that the half-value layer of lead for a gamma photon of energy 0.5 MeV is 0.42 cm, which of the situations listed below would result in the LEAST exposure to radiation? Staying in the same room as the gamma source for
Chapter: 17.2 / Q: 68
Which of the following is NOT a principle used to set radiation safety standards?
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