Keyword Search Choose a Category Chemical Detectors Biological Detectors Radiation Detectors Chemical / Biological Sampling Kits Training Information		Home > Detection > Radiation Detectors RAD-BADGE (DTRD103) The RADView™ PD dosimeter badge is a credit card size radiation dosimeter incorporating a self-developing radiochromic film to provide visual measurement of absorbed radiation dose. The film develops a distinctive and characteristic color upon exposure to ionizing radiation, becoming progressively darker in proportion to absorbed dose. RADView™ PD dosimeters are unaffected by brief exposures to sunlight or normal room light. The films are water resistant, tissue equivalent, energy independent and dose-rate independent. The badges do not require calibration or maintenance, have no electronics or batteries, and are small and light. The RADView™ PD can be read visually by the wearer at the incident scene. Most users would be able to visually estimate the dose to within ±20%. The visual readout does not require darkroom or processing equipment. View the RAD-BADGE FAQ International Specialty Products (ISP) holds numerous patents (U.S. Pat. 5,731,112 and others) on the chemical technology and design elements of RADView™ PD dosimeters. Originally developed for the medical industry, the active component in the dosimeter is a microparticulate, radiation sensitive diacetylene monomer dispersed in a polymer matrix and applied to a polyester film base. When the active monomer is exposed to ionizing radiation, a polymerization reaction immediately produces an intensely colored dye polymer that changes the appearance of the dosimeter. The amount of dye produced is proportional to the radiation dose. The dye polymer is cyan blue with a major absorbance peak at 635 nm and a minor peak at 585 nm and appears gray on the badge under the UV filter. The dosimeter will tolerate intermittent UV exposure and temperatures up to 140°F. Under most conditions, the dosimeter can be worn for one year before replacement. A quick visual observation of a RADView™ PD dosimeter allows anyone to assess the absorbed dose. Once an exposure is visually evident, a fully quantitative measurement to confirm the radiation dose can be performed, if required, by optically scanning the RADView™ PD dosimeter. The badge can be sent to Dade Moeller & Associates, Inc. for this independent readout and evaluation. In the RADView™ PD dosimeter, annular segments with calibrated background colors surround the radiation sensitive film in the center of the graphic display. The color of each segment is calibrated to the dose printed on that segment. The background colors of each segment are permanently printed on the badge and do not change, providing a constant reference value for each dose level. If the sensitive film in the center is darker than the background of a segment, the dose is greater than the number on that segment (“dose is darker”), as shown in the examples below. In the first illustration, the color of the center is lighter than the 2 dose segment, indicating the badge has not been exposed to radiation. As the radiation dose increases, the color of the center film gradually darkens. In the second illustration, the film in the center is darker than the 5 rem segment and lighter than the 10 rem segment. This indicates the badge has been exposed to a radiation dose between 5 rem and 10 rem. In the third illustration, the dose is between 25 and 50 rem. Note that the center film is darker than the 25 rem segment and lighter than the 50 rem segment.

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