Food sterilization dosage indicator
First Claim
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1. A multilayer radiation dosage indicator comprising(a) an indicator layer comprising an ion-sensitive ink, an ionic photoinitiator, and a proton source, wherein the ink undergoes a color change upon exposure to a known amount of sterilizing radiation;
- (b) a substrate; and
(c) an overlayer comprising an UV-absorber.
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Abstract
A multilayer food sterilization dosage indicator having (a) an indicator layer including an ion-sensitive ink, an ionic photoinitiator, a proton source; (b) a substrate, and an overlayer including a UV-absorber. The ink undergoes a color change upon exposure to a known amount of sterilizing radiation. A method for indicating the amount of exposure to sterilizing radiation using the dosage indicator.
18 Citations
21 Claims
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1. A multilayer radiation dosage indicator comprising
(a) an indicator layer comprising an ion-sensitive ink, an ionic photoinitiator, and a proton source, wherein the ink undergoes a color change upon exposure to a known amount of sterilizing radiation; -
(b) a substrate; and (c) an overlayer comprising an UV-absorber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for indicating an amount of exposure to sterilizing radiation, the method comprising the step of:
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providing a multilayer radiation dosage indicator comprising; (a) an indicator layer comprising an ion-sensitive ink, an ionic photoinitiator, and a proton source, wherein the ink undergoes a color change upon exposure to a known amount of sterilizing radiation; (b) a substrate; and (c) an overlayer comprising a UV-absorber; exposing said indicator to sterilizing radiation until a color change is observed. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for adjusting the selectivity of a multilayer radiation dosage indicator to sterilizing radiation, the method comprising the steps of:
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providing a multilayer radiation dosage indicator comprising; (a) an indicator layer comprising an ion-sensitive ink, an ionic photoinitiator and a proton source, wherein the link undergoes a color change upon exposure to a known amount of sterilizing radiation; (b) a substrate; and (c) an overlayer comprising a UV-absorber; selecting the amount of UV-absorber in the overlayer to prevent the ink from changing color upon exposure to UV radiation.
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Specification