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2. Lasers and UV Safety > UV > Flashcards

UV Flashcards

1
Q

UVA wavelength

A

400-315 nm

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2
Q

UVB wavelength

A

315-280 nm

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3
Q

UVC wavelength

A

280-100 nm

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4
Q

Thermal Daily Limit

A

E = 10,000 J/m^2 over any 8 hour period

315-400 nm eye

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5
Q

Photochemical Daily Limit

A

E eff = 30 J/m^2 over any 8 hour period

weighted, 180-400 nm eye and skin

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6
Q

Typical spectral irradiances for UVA

A

4 mW/cm^2

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7
Q

Typical spectral irradiances for UVB

A

0.2 mW/cm^2

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8
Q

Uses of UV radiation

A

room lighting
curing resin
germicidal irradiation (UVC)
black light

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9
Q

Properties of vacuum thermopile detectors

A

bare detector
converts optical energy to heat enregy
broad range of wavelengths
flat response

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10
Q

Properties of photon detectors

A

photoelectric or solid state
use with diffuser or filter
restricted range of wavelengths
match detector to lamp type
non uniform spectral response

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11
Q

What is UV spectrometry used for?

A

Calibration

intergrated counts at each wavelength step

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12
Q

Range of UV in tissue

A

0.1 mm

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13
Q

Which wavelength range is most damaging?

A

UVC
(280 - 100 nm)

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14
Q

Which wavelength range is most effective at causing erythema?

A

UVB
(315 - 280 nm)

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15
Q

What are the bio-effects of UV exposure?

A

vitamin D production
erythema
cataracts
sunburn
skin cancer

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16
Q

What is the weighting factor S(λ)?

A

used to modify the spectral irradiance data to take into account the wavelength dependency of adverse health effects on both the eye and skin

applies for 180-400 nm

17
Q

What is the S(λ) peak?

A

S(λ) = 1 at 270 nm

18
Q

PPE used in phototherapy

A

eyewear
visors

19
Q

What is MED?

A

Minimal erythema dose in an individual

20
Q

What is SED?

A

Standard amount of erythemally weighted radiation 100J/m^2

21
Q

What is effective irradiance?

A

Weighted spectral irradiance (W/m^2)

22
Q

Who provides guidelines for QC of UV sources?

A

British Association of Dermatoligists

2. Lasers and UV Safety (2 decks)

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