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Slide 1

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Radioactive sources
uses…read more

Slide 2

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Treatment of Cancer
Radiation used for cancer treatment
is called ionizing radiation because it
forms ions (electrically charged
particles) in the cells of the tissues it Ionizing radiation can be
passes through. This can kill cells or sorted into 2 major types:
change genes so the cells cannot
Photons (x-rays and gamma
Other forms of radiation such as radio
rays), which are most widely
waves, microwaves, and light waves used
are called non-ionizing. They don't Particle radiation
have as much energy and are not able (electrons, protons,
to form ions. neutrons, alpha particles,
and beta particles).…read more

Slide 3

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Treatments of Cancer
Some types of ionizing radiation have more energy than
others. The higher the energy, the more deeply the
radiation can penetrate (get into) the tissues. The way a
certain type of radiation behaves is important in planning
radiation treatments. The radiation oncologist (a doctor
specially trained to treat cancer patients with radiation)
selects the type and energy of radiation that is most
suitable for each patient's cancer.…read more

Slide 4

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How is it done Safely?
Radiation therapy uses certain types of energy to shrink
tumors or eliminate cancer cells. It works by damaging a
cancer cell's DNA, making it unable to multiply. Cancer
cells are highly sensitive to radiation and typically die
when treated. Nearby healthy cells can be damaged as
well, but are resilient and are able to fully recover.…read more

Slide 5

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Tracers ­ Type of emitters
Half life of a radioactive isotopes...
is a measurement of the rate of radioactive decay. (the time it
takes for half the nuclei to decay.)
If a radioactive isotope has a very long half life, then it remains
active for a very long time.
It can be used to date certain materials by measuring the
amount of radiation they emit- materials which can be dated
very old samples of wood
remains of prehistoric bones
certain types of rock…read more

Slide 6

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Tracers ­ Type of emitters
A tracer is a small amount of radioactive material which is put
into a patient so that its progress through the body can be
followed using a radiation detector outside the body.
The radioactive material must emit either gamma or beta
radiation- both of these are capable of passing out of the body
to be detected. It must have a short half-life so that the
patient doesn't stay radioactive for long.…read more

Slide 7

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