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X-Rays
- Part of the electromagnetic spectrum.
- They have a high frequency and a very
short wave length.
- They have a high frequency and a very
short wave length.
- Properties:
- They affect a photographic
film in the same way as
light.
- They are absorbed by metal
and bone.
- They are transmitted by
healthy tissue.
- They are transmitted by
healthy tissue.
- They are absorbed by metal
and bone.
- They affect a photographic
film in the same way as
light.
- Used to form images of bones
on photographic film.
- Used to check for fractures and
dental problems.
- Charged-coupled devices (CCDs) can
be used to form electronis images of
x-rays.
- CT Scans
- Use x-ray to produce digital images
of a cross section through the body.
- Some body organs made of soft tissue can
be filled with a contrast medium that
absorbs X-rays so that they can be seen on
an X-ray image.
- E.g The Intestines
- E.g The Intestines
- Use x-ray to produce digital images
of a cross section through the body.
- X-rays cause ionisation and can
damage living tissue when they pass
through it.
- Therefore precautions are taken;
workers wear film badges and when
possible use lead screens to shield
them from the X-rays.
- Therefore precautions are taken;
workers wear film badges and when
possible use lead screens to shield
them from the X-rays.
- X-rays may also be used for
therapy.
- They can be used to treat cancerous
tumours at or near the body surface.
- They can be used to treat cancerous
tumours at or near the body surface.
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