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Wael Hammad Questions
10601 Questions
Which of the following is NOT a principle used to set radiation safety standards?
Medicine
2022-10-21
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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
Medicine
2022-10-21
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30
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98
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?
Medicine
2022-10-21
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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)?
Medicine
2022-10-21
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107
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)
Medicine
2022-10-21
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101
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?
Medicine
2022-10-21
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96
Which of the following absorbed radiation dose equivalents would cause the most harm to your body?
Medicine
2022-10-21
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121
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?
Medicine
2022-10-21
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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
Medicine
2022-10-21
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107
Which of the following body parts is the least sensitive to radiation?
Medicine
2022-10-21
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97
What does the ‘relative biological effectiveness’ (RBE) of radiation depends on?
Medicine
2022-10-21
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272
What does the ‘maximum permissible dose’ of radiation (100 mSv/5 yr period) refer to?
Medicine
2022-10-21
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How has remote-controlled after-loading reduced the dose to staff involved in brachytherapy?
Medicine
2022-10-21
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