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Radiation in medicine
Terms in this set (14)
Radioactive tracers (medical) Radioactive tracers are used to
follow the flow of a substance through a system
The gamma camera can show
where a patient has absorbed a tiny amount of radioactive substance
Doctors can tell from the image obtained
how well particular organs are functioning
Tracers: The tracer must emit radiation that can pass out of the body and be detected (_____ or beta)
Tracers: The tracer must not be strongly ________ to minimise damage to body tissue
Tracers: The tracer must not _____ into another radioactive isotope
Tracers: The tracer must have a s_ _ _ _ _ _ _ _- _ _ _ _ so it is not present in the body for a long periods
Tracers can be used to diagnose life-threatening conditions
but the risk of cancer from one use of a tracer is very small.
The diagram shows how three separate gamma beams are used to treat a cancer tumour. Why is this preferred to using one powerful beam?
Single beam will damage both healthy or cancer cells but all three beams are focussed on the tumour so these cells receive a triple dose of radiation to kill them and reduce harm to healthy cells.
Radiotherapy is the treatment of cancer using
Radiotherapy - can be used to ------- or d------ cancer cells.
control or destroy
High doses of radiation will kill
living cells, including cancer cells.
The radiation has to be directed carefully at just the right dosage
so as to kill the cancer cells without damaging too many normal cells.
Radioactive implants (usually beta emitters) can also be placed
next to or inside the tumours.
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