Radioactivity in the neighborhood: SAT disposes of the “unpleasant legacy” of the Swiss watch industry
Until the 1960s, luminous paint containing radium was used in the production of watches in Switzerland. This made it possible to read the hands even in the dark. It was not until 1963 that this form of production was banned, because the toxic and carcinogenic effect of the radioactive substance had been recognized. Radium has a half-life period of around 1,600 years and residues of the old paint can be found at over 700 former production sites in Switzerland, according to an investigation by the Swiss “Bundesamt for Gesundheit” (Federal Office of Public Health) as part of the “Aktionsplan Radium” (Radium Action Plan).
At 200 of these, the contamination is so high that an urgent need for remediation has been identified. The surprisingly high number of contaminated sites is due to the fact that, at the time, many production steps were carried out at home, where the paint was used.
The decontamination work was carried out by the ROBUR partner SAT KERNTECHNIK on behalf of the Federal Office of Public Health. For this purpose, the paint residues are measured radiologically, made visible by UV light, among other things, and then professionally removed and safely prepared for landfilling or disposal.
The effort for the SAT teams, each consisting of two people, was considerably high. The reason for this was that the paint was distributed over a wide area in the various, often private, properties, so that remains were regularly found in a great variety of places. From radiators to door handles, in drains and of course in the floors of rooms or the gardens of the houses. The radium had spread over a large area. Therefore, the cleanup of each of the former “private” production sites typically took between 2 and 4 weeks. Another complicating matter was the fact that the sites were spread over virtually the whole of Switzerland, requiring a high degree of mobility of the materials and the operation teams.
Of course, not only were the rooms and floors decontaminated, but the Federal Office of Public Health had also arranged for all employees involved in the cleanup to be closely examined and checked to determine whether they might be at risk from incorporation during the work.
Therefore, the permanent presence of a radiation expert was obligatory, protective suits and masks were mandatory for all those involved, as was the wearing of a dosimeter with which the radiation was measured.
Thanks to the experience of the colleagues at SAT KERNTECHNIK as a specialist for dismantling and waste management in nuclear facilities this was a well know situation of course. As a result, the decontamination work has already been successfully completed in large parts of Switzerland and the residents have been able to return to their homes with peace of mind and continue to live there without worries.
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