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General
These wallet cards take advantage of the award winning technology pioneered by Dr.Gordhan Patel of JP Laboratories in New Jersey. The technology uses polydiacetylenes which change color as they absorb radiation. The darker the color, the higher the radiation dose. Dr. Patel first published and patented the use of diacetylenes as radiation detectors in 1974.
See detailed photo here.
Uses
The JP Laboratory wallet cards are suitable for people that would like an immediate indicator of significant radiation dose (2 rem or more). Possible users include first responders, military, and general public that would like an inexpensive peace of mind indicator. They are also useful as an additional personal dosimeter. You keep it in your wallet and use it to verify that there has been no significant exposure.
Visual dose indicator
The material in the card changes color with increasing absorbed dose.The dose can be estimated immediately to allow fast decisions. (Click here to see photo)
Why this one and not the competition?
This card has several unique features that make it easier to use, and more reliable. The card comes with a UV-shielding thin plastic film that completely protects the card from false positives arising from exposure to UV radiation. The competition uses colored translucent film that only paritially blocks the UV, so that they can register false dose if left in the sun for longer than "brief periods." The JP Labs card (sold here) also incorporates a special FIT indicator (see below) that gives an immediate visual indicator of any tampering or exposure to excessive heat or UV (if the protective cover is removed, for example.) Finally, the material used in our card has a higher temperature threshold. While others state that they should not be subjected to temperatures higher than 60 degrees C, our card can be exposed to up to 90 degrees C. While they seem extreme, these temperatures are possible on the dashboard of a closed up car on a hot summer day.
FIT Indicator
The unique fit indicator (patent pending) indicates if the card has been tampered with, exposed to excessive sunlight or heat (click on links to see photos) or is otherwise unsuitable for use.
