What is dosimetry?
Cody Miles | July 4, 2018
Dosimetry is an accurate and systematic measurement of the absorbed dose in matter and tissue resulting from exposure to ionizing radiation.
Radiation Detection Company measures radiation exposure using thermoluminescent dosimeters. These dosimeters contain four separate phosphors. The badges are read with control values that are subtracted from the personnel badges. An algorithm then selects the correct energy the badge was exposed to in order to apply the appropriate dose.
When the thermoluminescent phosphors within the dosimeter are heated, the previously absorbed energy from the ionizing radiation is released in the form of light. We can accurately measure the light output with a device called a photo-multiplier tube. The signal from the photo-multiplier tube is then used to calculate the dose that the material had absorbed.
The type of radiation each badge is exposed to is determined through energy discrimination from filtration between the source and the phosphor material. As the radiation passes through the filters, some of the energy is shielded. Using the ratio response of the four phosphors, we can determine your proper dose.
All of our dosimeters contain either lithium fluoride, or lithium borate phosphors. Unlike aluminum oxide, these phosphors are considered tissue equivalent. This means we can accurately determine your dose using phosphors that respond to radiation almost exactly the way the tissue in your body does.
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