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In 1955, the NPL invented the first atomic clock of the sort that is used today, based on the frequency of radiation from an atom of the element caesium.

In 2022, SecDev, a geopolitical risk consultancy based in Canada, conducted an evaluation, which established that Russia had occupied 63% of Ukrainian coal mines, and half of its manganese, caesium, tantalum and rare earth deposits.

Within the sensors, the light passes through a small glass container containing a caesium gas, which absorbs the light at the right light frequencies.

This is because more radioactive caesium from Chernobyl will seep further into the soil, further contaminating the truffles.

It contains the caesium 137 ceramic source, commonly used in radiation gauges, which emits dangerous amounts of radiation, equivalent of receiving 10 X-rays in an hour.