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US 4,062,713 AGranted
Photodosimeter film badge
AssigneeBeckman Instruments, Inc.
InventorRobert J. Anderson
Life of this patent
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Abstract
A film badge sensitive to non-ionizing radiation and a method of making same. The film badge consists of dissolved bilirubin bound in a polymeric film base and sealed within an optically transparent substrate. The film badge is useful during phototherapy for the treatment of hyperbilirubinemia in the newborn and is capable of measuring the total irradiance effective in decomposing bilirubin.
Claims7
The method of making a film which is sensitive to non-ionizing radiation comprising the steps of:
- a. dissolving bilirubin in an organic solvent capable of dissolving primarily the IX-alpha isomer of bilirubin while introducing substantially no oxygen to form a first solution;
- b. dissolving a polymer in said organic solvent to form a second solution;
- c. adding trace chemicals capable of absorbing oxygen to both said first and said seconds;
- d. combining said first and second solutions;
- e. forming said combined solution into a thin film of uniform thickness;
- and,
- f. drying said thin film slowly in an oxygen-excluded atmosphere to evaporate said organic solvent to form a thin film of the IX-alpha isomer of bilirubin bound in a polymeric film base.
4 more elements
Dependencies are inferred from the claim text.