Activity is a measure of the amount of radionuclide(s) in a material emitting ionising radiation. Activities in samples are measured in Becquerel. Berthold offers several instruments for alpha-beta or gamma counting. Especially for environmental samples or wipe tests there are low or even very low detection limits required. Our low-level counters meet these requirements. They use special background reduction techniques, selected detector materials and lead shieldings to provide excellent MDAs. There are also other instruments for instance for food monitoring.