Radiation in treatment and medicine Flashcards

1
Q

what does radiation do

A

radiation transfers energy from place to place

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2
Q

what does radiation include

A

all em waves, sound waves, and energy transferred by particles

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3
Q

how do CAT scans work

A

use X-rays to scan body

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4
Q

give advantages and disadvantages of CAT scans

A
A:
> detailed images
> 3D images can be built up on a computer from sectional scans
D:
> expensive equipment
> relatively high radiation dose
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5
Q

how do ultrasound scans work

A

high frequency sound waves are reflected by features inside a patients body

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6
Q

give advantages and disadvantages of ultrasound scans

A

A:
> very low risk - allows a real-time image to be viewed
D:
> none - widely used in prenatal monitoring

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7
Q

how do endocopes work

A

uses fibre optics to provide live view of the internal structures in a patient

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8
Q

give advantages and disadvantages of using endoscopes

A

A:
> provided direct, real-time view of internal body tissue
> allows keyhole surgery, without the need for major surgery
D:
> cannot see through tissues

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9
Q

what is the intensity of radiation

A

it is the amount of energy arriving per second over an area of 1m^2. energy spreads out from a source in all directions.

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10
Q

explain the link between intensity and distance

A

the intensity decreases with distance because the radiation is spread over an increasing area

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11
Q

Use the equation:

intensity = power of incident radiation / area

A

s

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