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US 4,308,459 AGranted
Ultraviolet radiation detection device
OwnerGwyn P. Williamsinventor
Life of this patent
Estimating the term…
Abstract
An ultraviolet dosimeter, which indicates dose accumulation by the multicolored change of a sensitized element. The indicated doses are readily observed in bright sunlight by direct comparison with standards.
Claims10
An ultraviolet dosimeter comprising:
- (a) an element coated with an ultraviolet sensitive film which changes through a plurality of colors, the color being produced is dependant on the duration of the exposure to ultraviolet radiation in the wavelength range (290-400 nm) which is known to cause enythema and melanogenesis, and
- (b) a set of comparison colors adjacent to the sensitized element to place the sensitized element in a position where it may be readily compared with the comparison colors to measure the dose of ultraviolet radiation accurately.
A process for fabricating an ultraviolet dosimeter comprising the steps of:
- (a) providing a paper substrate,
- (b) printing sensitized portions on said paper by application of a latex emulsion containing multiple acid sensitive dyes to produce variable colors upon continuing exposure to ultraviolet radiation, and
- (c) printing on said substrate about said sensitized portions comparison colors corresponding to the colors produced during continued exposure of the sensitized portions to indicate the dose of radiation received.
Dependencies are inferred from the claim text.