My first experience with environmental testing was when I worked for a small R&D firm that was developing radiation-measurement equipment. One project was a radiation-detection badge for the U.S. Navy. The military specs required that the plastic badge survive hot and cold storage, a 6-ft drop onto a concrete floor, and depth testing down to 100 ft. All these tests were easy to perform, and with the property data sheets from suppliers the designer easily pinpointed a suitable ABS resin. A more-difficult project also under development was a detection system that needed flexible sensors for monitoring radiation. Manufacturing the sensor required encapsulating various radiation-sensitive materials in an adhesive that could be silk-screen printed onto flexible, thin-film substrates. The radiation-sensitive materials were thermoluminescent (TLD) phosphors that when heated from between 120 and 240°C emit light if they have been exposed to radiation. The amount of light emitted by the phosphor was proportional to how much radiation the sensor saw. Once the signal is zeroed, or read out, TLD phosphors can be used again. Traditional ways of heating such phosphors include heated metal planchets or hot gas. Our method, however, employed a 15-W CO laser which sped up the heating process and let us design a system that could heat a printed array of TLD phosphor spots individually. By reading each spot and treating the corresponding signal as a pixel, an algorithm could then plot the readings as a two-dimensional contour map of exposure. For selection of the substrate and adhesive, supplier property data sheets were only helpful in rejecting materials that could not withstand high temperatures. With hindsight, it's easy now to see how some of the problems we encountered late in the design phase may have been avoided if we would have been more vigilant testing prototypes made with sample materials,
Products & Services
TLD and Film Badges
TLD (Thermoluminescent dosimetry) badges and film badges are used to detect radiation at levels that can be harmful to humans.
Radiation detectors are used for medical diagnoses, radioactive dating measurements, and measurements of background radiation, activity levels and radiation doses.
Adhesive tapes are used to assemble materials or parts together using a sticky chemical bond.
Silicone Adhesives and Sealants
Silicone adhesives and sealants have a high degree of flexibility and a very high temperature resistance (up to 600° F), but lack the strength of other epoxy or acrylic resins.
UV Light Systems
UV light systems provide ultraviolet light for identification, tracing, curing, disinfection or processing applications.
Topics of Interest
In-Vivo Dosimetry (Dose Calibration Factors)
It is strongly recommended to perform a separate calibration for each radiation beam quality. If the TLDs can be identified, a calibration factor could...
Calcium Fluoride (CaF 2)
CaF 2, activated by various dopants, is a TL phophor widely used in many dosimetric applications. It is used as natural CaF 2 or with different activators as Mn, Dy and Tm...
Fluorescent lamps are high-efficiency lamps that produce visible light as a result of an interaction of the ultraviolet (UV) energy they produce with the phosphor coating on the...
Zirconium Oxide (ZrO 2)
Zirconia has very much attracted the attention of technologists and scientists owing to its combined electrical, chemical, optical and mechanical characteristics. All these...
The next big prototyping tool for white goods could end up being a pair of scissors. The world's thinnest EL driver, according to Pelikon. That's because new electroluminescent (EL) displays targeting...