the Philips KL7071 sunlamp emitted UV-A and UV-B for therapeutic and cosmetic applications
Philips KL7071 sunlamp
Ultraviolet radiation can be divided into three main
categories that differ from each other by their effect
on living organisms. These three categories are
UV-A with wavelengths ranging from 400 to 315
nanometers, UV-B with wavelengths from 315 to
280 nanometers and UV-C with wavelengths from
280 to 100 nanometers. UV-C carries the most
energy and it is the most harmful of the three.
Exposure of the skin to UV-C very quickly leads to
symptoms of burning and it is suspected to cause
skin cancer. UV-C that is emitted by the sun is
almost completely absorbed in the ozone layer of
the atmosphere. Dedicated UV-C radiators were
designed for disinfecting of surgical instruments or
for sterilisation of food but small quantities of UV-C
could also be present in UV-A and UV-B radiators.
The significance of ultraviolet radiation for
therapeutic applications was mainly limited to UV-A
and UV-B as emitted by devices like the Philips KL7071 sunlamp on display here.
UV-A penetrated deeper into the skin than did UV-B and it was responsible for the
tanning of pigment that was already present there. The difference in the tanning effect
of UV-radiators of various types and brands could mainly be explained by differences
in the relative contribution of UV-A and UV-B. UV-A leaded to a quicker tanning, the
tanning of UV-B lasted longer.