UV Glossary
9-3
Part 1105120-03
E 2015 Nordson Corporation
germicidal UV Low-powered UV in the UVC band. Usually powered with several
100-watt power supplies or less instead of several 1000-watt power
supplies. Nordson’s UV Star and CoolWave product lines are much
higher in irradiance and energy density than germicidal UV products.
indium A silver-white metallic element used in additive mercury bulbs. The
indium additive provides a yellowish tint to an un-energized UV bulb
and a violet coloration to the UV output. Indium is used to shift the
spectral output past 400 nm. In some industries, indium bulbs are
referred to as Q bulbs.
infrared energy Energy having wavelengths between 1 and 100 μm.
integral cooling fan
(blower)
The bulb-cooling fan when it is mounted to the lamphead.
integral shutter A shutter assembly that is built into the lamphead. Common designs
include a pneumatically actuated clam shell that blocks the light when
closed and acts as a reflector when open and a pneumatic slide
mechanism that moves the lamphead behind an internal louver when
shuttered. Shutters are typically associated with electrode systems.
intensity The amount of UV energy delivered to a particular area per unit time,
measured in joules/cm
2
/sec or watts/cm
2
/sec. Also referred to as watt
density. Improperly referred to as dose rate.
iron A white metallic element used in additive mercury bulbs. The iron
provides a reddish tint to an un-energized UV bulb and a bluish
coloration to the UV output. Iron is used to concentrate the spectral
output between 350 and 400 nanometers. In some industries, iron
bulbs are referred to as D bulbs.
irradiance Radiant power arriving at a surface from all forward angles per unit
area, measured in watts/cm
2
.
irradiator Refer to lamphead.
joule Metric unit for measuring work or energy. One joule is equivalent to the
work done by a force of one Newton acting through a distance of one
meter. (1 KW-hour equals 3.6 x 10
6
joules).
lamp Refer to bulb.
lamphead Assembly containing a sheet metal housing and cover and integral or
remote cooling fan. An electrode system also contains cradles and a
microwave system contains magnetrons, a cavity, and a screen.
light detector A photocell inside a microwave lamphead that confirms UV output.
long UV Refer to UVA.
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