What type of radiation is used for thickness monitoring and why?
Beta because it can penetrate foil whereas alpha would just be absorbed
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What length is the half life of the radiation used in thickness monitoring?
Long, so that it lasts long enough to work
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How does thickness monitoring work?
A detector on the other side of the metal foil measures the amount of radiation passing through it. If the thickness increases too much, the detector reading drops.
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What type of radiation is used for radioactive tracers and why?
Gamma is used because it is the least ionising and can be detected outisde of the body.
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What is the half life of the radiation used i radioactive tracers?
Short, so that it doesnt stay in the body for too long but its in there long enough to take a test reading.
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How do radioactive tracers work?
The radioactive substance flows in and out of a normal kidney.The detector reading goes up and back down. If the kidney is blocked the reading goes up and stays up as the radioactive substance cannot flow back out.
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What type of radiation is used for a smoke alarm and why?
Alpha because it conducts a current across the gap in the circuit in the alarm.
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What should the half life of the radiation be in the smoke alarm?
Long as it needs to be long lasting as smoke alarms don't need replacing very often.
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How does a smoke alarm work?
The alpha particles ionise the air in the gap so it conducts a current
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Other cards in this set
Card 2
Front
What length is the half life of the radiation used in thickness monitoring?
Back
Long, so that it lasts long enough to work
Card 3
Front
How does thickness monitoring work?
Back
Card 4
Front
What type of radiation is used for radioactive tracers and why?
Back
Card 5
Front
What is the half life of the radiation used i radioactive tracers?
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