Scope and intended application
This specification relates to:
a white undercoat paint;
an unpigmented paint medium;
a tritium-activated luminous compound.
The luminous compound is designed to be mixed with the paint
medium to form a luminous paint.
The luminous paint is intended to be used in conjunction with
the white undercoat to form a painting system for the preparation
of markings on instrument dials and pointers which will be
protected from gross contamination with water by at least a cover
giass This paint system will be applied over the normal protective
paints on wood or metal by brushing, peg stick or silk screen
Precautionary note on handling this
The manipulation of radio-active luminous compounds and paints
is governed by the Factories (Luminising) Special Regulation, 1947.
Attention is also drawn to the Radio-active Substances Act 1960,
and to an Introductory Manual on the Control of Health Hazards from
Radio-active Materials, prepared for the Medid Research Council by
the Atomic Energy Research Establishment.
All manipulation of luminous compounds and luminous paints shali
be carried out in a cabinet, efficiently ventilated by mechanical
means to the open air and maintained at a pressure slightly lower
than atmospheric to prevent escapes of radio-active materials. A
suitable cabinet is shown in D.C.I, Diagram No. 147.
When the luminous paint is used for luminising it is recommended
that it should be applied at a dry film thickness of the order
of 1/64 inch which corresponds to a luminosity of 0.007
candela/ft². The level of radio-activity associated with a luminous
paint coating of this thickness is of the order of one rad per hour
per square inch of the luminised surface.