Medical Physics

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x-ray energy used to distinguish between bone and tissue
30-100 keV
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CT scanner voltage
100-150 kV
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wavelength of an x-ray
10^(-10) m or less
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image intesifier increases brightness by
x 5000
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time taken to produce image using intensifying screen
30 x faster
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1 MeV to joules
1.6 x10^(-13)
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avogadro's constant
number of molecules in 12g of carbon-12
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atomic mass unit
1/12 of the the mass of one atom of carbon-12
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Celcius to Kelvin
+ 273
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the separation needed to resolve an image
2 or more retinal cell diameters
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wavelengths the eye can see
400-650 nm
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blue cones
430 nm peak, smallet peak
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red cones
590 nm peak, medium peak
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green cones
550 nm, tallest peak (for cones)
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rods
500 nm, tallest peak (overall)
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range of frequencies a human ear can hear
20-18000 Hz
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ear ossicles amplify force by
x 1.5
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threshold intensity
1 x 10^(-12) Wm-2 at 1 kHz
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resonance in ear occurs at
3000 Hz
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area of oval window compared to ear drum
x 20 smaller
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hearing loss due to age
all frequencys, increases as frequency increases
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hearing loss due to noise
at 4 kHz
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ultrasound frequency
1-10 MHz
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pulses in an ultrasound probe
a few µs
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time for an action potential
0-5 ms
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ECG traces maxiumum voltage
1 mV
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time for 1 PQRST wave
0.8 ms
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action potential voltages
-70 mV to +30 mV
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diameter of a fibre of an endoscope
0.01 mm
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α emitters
Z value more than 60
30 of 33
β- emitters
neutron rich
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β+ emitters
proton rich
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Fe-56
8.7 MeV
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Other cards in this set

Card 2

Front

CT scanner voltage

Back

100-150 kV

Card 3

Front

wavelength of an x-ray

Back

Preview of the front of card 3

Card 4

Front

image intesifier increases brightness by

Back

Preview of the front of card 4

Card 5

Front

time taken to produce image using intensifying screen

Back

Preview of the front of card 5
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