Light safety Flashcards
(29 cards)
How is the Maximum Permissible Exposure (MPE) defined for a laser?
Safe exposure limit for eyes and skin
How is the Nominal Occular Hazard Distance (NOHD) defined for a laser?
Distance at which irradiance [W/m^2] or radiant exposure [J/m^2] equals the MPE.
What are the Regulations for lasers and UV in the UK?
Control of Artificial Optical Radiation at Work Regs (CAORWR)
Which two laser classes require local rules?
Class 3B and 4
UVA bandwidth?
315 - 400 nm
UVB bandwidth?
280 - 315 nm
Units for irradiance?
W/m^2
UVC bandwidth?
100 - 280 nm
Units for radiant exposure?
J/m^2
What is effective irradiance?
Irradiance weighted according to CIE erythema action spectrum
What is standard erythemal dose (SED)?
100 J/m^2
How many SED for just-perceptible erythema?
1.5 to 6 SED
What is UV index a measure of?
Effective solar irradiance [W/m^2]
What is the workplace weighted artificial UV radiant exposure limit over any 8 h period?
30 J/m^2
What is the workplace unweighted artificial UVA radiant exposure limit over any 8 h period?
10,000 J/m^2
Which IPEM report contains guidance on phototherapy safety?
IPEM 101
What is the photometric quantity for intensity?
Illuminance [W/m^2]
What is the radiometric quantity for intensity?
Irradiance [W/m^2]
What is the photometric quantity for power?
luminous power [lm]
What is the radiometric quantity for power?
radiant power [W]
What is the photometric quantity for energy?
luminous energy [J]
What is the radiometric quantity for energy?
radiant energy [J]
What wavelength range is IR?
700 nm - 1 mm
What wavelength range are microwaves?
1 mm - 1 m
