Fact check: Radioactive kettlebells at Action? SCK CEN explains.
Last week, supermarket chain Action recalled 10 kg kettlebells sold in Belgium and the Netherlands between 28 July and 8 August (see also hln.be). Inspection revealed that certain weights emitted elevated levels of ionising radiation. The reason? Kettlebells are filled with zircon sand, which naturally contains small amounts of radioactive substances. While the radiation is not acutely dangerous, prolonged or heavy use of the item may pose a limited health risk. The recall is therefore a precautionary measure.
What exactly is zircon sand?
The sand in the kettlebells in question is zircon sand. It is a natural mineral commonly used in industrial applications, including ceramics, moulds, and occasionally as a filler material. Naturally, it includes trace amounts of radioactive substances like uranium and thorium, producing a low yet measurable dose of ionising radiation, here measured at 9 becquerels per gram. While not exceptionally high, extended and frequent exposure can result in a limited radiation dose. As a result, its use in consumer products is tightly regulated.
Radioactivity in everyday life: common but rarely dangerous
Did you know that a number of everyday items give off low levels of radiation? We have come across these kettlebells, but also jewellery, sleep masks, and even compression stockings. That sounds alarming, but it is usually harmless.
At SCK CEN, the Belgian nuclear research centre, we understand that the word 'radioactive' often raises concerns. Radioactivity is, however, everywhere: in the air, in the ground, and even within our own bodies. It is a natural phenomenon that only poses a risk at high doses or with prolonged exposure. This news about kettlebells offers a good opportunity to explain what radioactivity is and, crucially, why it is not always a cause for panic.
How do we measure radioactivity?
Radioactivity is invisible, odourless, and neither tangible nor directly perceptible. Nevertheless, it can be measured with specialised devices, such as a Geiger counter, which counts the passing radiation particles. This allows us to estimate how much radiation an object or environment emits.
For instance, a Geiger counter might indicate higher radiation levels in a kettlebell, yet that does not automatically imply a risk. Exposure level and duration are key factors. Short periods of exposure to slightly elevated radiation are typically harmless.
The impact of radiation: how dangerous is it really?
Radiation is everywhere. In the air, in the soil, in our food, even in our own bodies. We refer to this as natural background radiation. It is usually low and poses no danger. Only at higher doses – such as in medical imaging or nuclear power – is it essential to measure and take proper precautions.
In the case of kettlebells, the radiation is slightly elevated, similar to the dose received on a short flight. Not ideal, but not a cause for concern. Even so, it is just as well that Action recalled this product, as prevention is always better than cure.
Acquiring, sharing, and safeguarding nuclear knowledge
At SCK CEN, we work with radioactivity every day; it’s our speciality. This is why we consider it our duty to provide insight whenever the subject comes up in the news. Our goal is to provide clear, scientific explanations that reassure and distinguish fact from fiction. By sharing our expertise, we help foster a better understanding of nuclear technology. We therefore prepare tomorrow’s experts and contribute to a well-informed public debate.
Do you have questions about radiation or radioactivity?
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