Locating Radiation by The Mobile Phone

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In accidents or terror attacks which are suspected to involve radioactive substances, it’s difficult to determine whether people nearby have been exposed to radiation and to what extent. By analyzing mobile phones and other objects which come in close contact with the body, it’s possible to retrieve important information on radiation exposure. This has been shown by a new thesis from Lund University in Sweden.

According to the university’s site, the nuclear power plant disasters in Chernobyl and Fukushima are two examples of accidents which have exposed the population to ionizing radiation. “Being able to quickly determine whether someone has been exposed to radiation is a major advantage. In case of a nuclear power plant disaster, many people are worried, even when only a small number of people have been exposed to harmful levels of radiation”, explains Therése Geber-Bergstrand, medical physicist and doctoral student at Lund University.

Together with her colleagues, Therése Geber-Bergstrand examined a number of objects or materials that come in close contact with the body and which have the potential of providing information on whether the carrier has been exposed to radiation. Among the objects examined were: mobile phones, teeth, and dental fillings. The study showed that several of the materials contained very promising properties, not least mobile phones. They contain resistors made from aluminum oxide, which can provide information about radiation as late as six years after the time of exposure. During analysis, the phone is dismantled and the resistor is subsequently examined using a light-sensitive measuring technique, known as Optically Stimulated Luminescence (OSL).

“The results from the mobile phones were very promising. Even though further studies are required, phones can be used right away. We have an agreement with the Swedish Radiation Safety Authority about analyzing a number of mobile phones in our emergency preparedness lab when needed”, said Therése Geber-Bergstrand.

Analysis of mobile phones and other tested objects can also be performed on a large scale and relatively quickly. It may be possible to receive a test result within one or two hours, compared to the couple of days it can take to receive tests results from a medical exam. According to Therése Geber-Bergstrand, an initial check of the mobile phone can, therefore, be a valuable tool for determining who needs to undergo more time-consuming and resource-intensive tests.