Science - P4 - Ultrasound and Nuclear Radiation

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What are the medical uses of Ultrasound?
-scans to see inside the body WITHOUT surgery. -measuring the rate of blood flow. -breaking up kidney stones.
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Ultrasound is _________
sound above 20 000Hz which is a higher frequency than humans can hear.
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LONGITUDINAL waves - e.g sound and ultrasound. TRANSVERSE waves - e.g light.
WAVELENGTH - the distance occupied by one complete wave. FREQUENCY (f)- measured in hertz (Hz) is the number of complete waves in 1 second.
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Nuclear equations are used to represent decay:
or decay:
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Gamma rays are given out from the nucleus of certain radioactive materials. x-rays are made by firing high speed electrons at metal targets.
Nuclear radiation is emmited from the nuclei of radioisotopes: particle is a helium nucleus particle is a fast-moving electron radiation is a short wavelength electromagnetic wave.
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Medical uses of radioactivity include: diagnosis(as a tracer), sterilising equipment, treating cancer. Only and can pass through skin. radiation is most widely used as it is the most penetrating
Others include: smoke detectors, industrial tracers, dating rocks and archaeological finds.
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FISSION is the splitting up of a large nucleus. FISSION is currently used to generate electricity. FISSION leads to a chain reaction which must be carefully controlled. BOTH release A LOT of energy.
FUSION is the joining together of smaller nuceli.
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The half-life is..
the average time for half of the nuclei present to decay.
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Other cards in this set

Card 2

Front

Ultrasound is _________

Back

sound above 20 000Hz which is a higher frequency than humans can hear.

Card 3

Front

LONGITUDINAL waves - e.g sound and ultrasound. TRANSVERSE waves - e.g light.

Back

Preview of the front of card 3

Card 4

Front

Nuclear equations are used to represent decay:

Back

Preview of the front of card 4

Card 5

Front

Gamma rays are given out from the nucleus of certain radioactive materials. x-rays are made by firing high speed electrons at metal targets.

Back

Preview of the front of card 5
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