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SPE104: Imaging with Non-Ionising Radiation > LASER: UV > Flashcards

LASER: UV Flashcards

1
Q

What is the Maximum Permissible Exposure for the eye from UV radiation?

A

10,000 J/m^2 (315-400nm)

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2
Q

Over what time frame is the Maximum Permissible exposure calculated?

A

Over a 8 hour working days

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3
Q

What wavelength region of the electromagnetic spectrum is covered by UVA?

A

315-400nm

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4
Q

What wavelength region of the electromagnetic spectrum is covered by UVB?

A

280-315nm

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5
Q

What wavelength region of the electromagnetic spectrum is covered by UVC?

A

100-280nm

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6
Q

What are the components of a UV radiometer?

A 
Diffuser
Filter
Detector
Amplifier
Display
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7
Q

What are the features of a Bare silicon detector?

A

+/-50% inherent variation in the 250-400nm band
UVA phototherapy-type filter
Shaped to accept 315-390nm only (UVA)
Calibration is source specific

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8
Q

What are the features of a bare GaSP detector?

A

+/-50% inherent variation in the 250-400nm band
UVA phototherapy-type filter
Shaped to accept 290-340nm only (UVB/A)
Calibration is source specific

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9
Q

What are some errors in spectro-radiometry?

A 
Wavelength calibration
Correct Bandwidth
Effect of Stray radiation
Angular dependence of incoming photons.
Linearity of device
Use of Calibration source
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10
Q

How do you calibrate a narrow band detector?

A

Measure the spectral irradiance of the source of interest with a spectra-radiometer.
Integrate over the waveband of interest.
Place the narrow band detector in the same location as the spectra-radiographer.
Adjust meter so it reads correctly.

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11
Q

What is used for personal dosimetry when working with UV and what properties does it have that make it ideal?

A

Polysulfone film
- High-performance plastic sheet detects change in light transmission.
Response is proportional to dose, but independent of dose rate and temperature.
Action spectrum matches the bio-effect.

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12
Q

What are four effects that UV radiation has on the skin?

A

Sunburn
Skin Cancer
Skin Aging
Vitamin D Production

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13
Q

How far can UVA penetrate into the eye?

A

Can reach the retina.

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14
Q

How far can UVB penetrate into the eye?

A

Stopped by the cornea.

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15
Q

What is an acute effect of UV radiation on the eye?

A

Photokeratitis (Snow Blindness)

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16
Q

What is a chronic effect of UV radiation on the eye?

A

Cataracts.

SPE104: Imaging with Non-Ionising Radiation (12 decks)

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