UV Glossary
9-4
Part 1061253B
E 2006 Nordson Corporation
gallium A bluish-white metallic element used in additive mercury bulbs. The
gallium additive provides a yellowish tint to an unenergized UV bulb
and a violet coloration to the UV output. Gallium bulbs have a spectral
peak around 417 nm and a spectral concentration between 400 and
450 nm. They are often used when deeper cure is required or with
white coatings containing titanium oxides. In some industries,
microwave gallium bulbs are referred to as V bulbs.
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.
housing The lower half of the lamp head assembly. Its function is to support the
cradle.
igniter Refer to starter.
indium A silver-white metallic element used in additive mercury bulbs. The
indium additive provides a yellowish tint to an unenergized 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 lamp head.
integral shutter A shutter assembly that is built into the lamp head. 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 lamp head 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 unenergized 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
.
