But it is impracticable to equip everyone with a dosimeter. Preparedness for an accident where the general public are exposed to radioactivity requires a simpler solution. A group of radiation physics researchers at Linköping University looked for an everyday article that many people carry around in their pocket or bag.
Tried mobile phones and chewing gum
“We were looking for a material in or around the body where we would be able to detect radiation doses retroactively. One thing we tried was mobile phones. By pure chance we tested some chewing gum,” says Axel Israelsson, who documented the findings in his doctoral thesis.
It is xylitol, the sweetening agent in the chewing gum, that is altered when it is exposed to ionizing radiation. Substances known as free radicals are formed, which are conserved in the crystalline material and can be measured with a spectrometer.
Terrorist attacks with “dirty” bombs or incidents with radioactive waste are credible threats where a simple and fast method of measuring radiation exposure is crucial. In a densely populated area it would be enough for a few people to have chewing gum in their pockets to assess who is in need of medical attention.
“The important thing is to point the way to the right medical treatment and separate out those with the greatest need of attention,” Mr Israelsson says.
Investigated whether hair could functionThe research group also investigated whether hair could function as a biological measuring instrument for uranium, for example among people who drank water from wells bored into mountains or who work in the nuclear fuels industry. By investigating individual strands of hair using advanced methods, the uranium traces stored at different times could be detected.
The research was financed by the Swedish Civil Contingencies Agency (MSB in Swedish) and the Swedish Radiation Safety Authority.
Thesis: Chewing gum and human hair as retrospective dosimeters by Axel Israelsson. Linköping University Medical Dissertations No 1408, September 2014.
Related links: Division of Radiological Sciences