Physics

The potassium chloride Standard Test Source enables science departments to check the performance of GM tubes and counting equipment by measuring comparative detector beta efficiency.

Each test source contains a precisely measured 300 mg disc of pure, laboratory-grade potassium chloride, sealed within a durable transparent acrylic slide. The naturally occurring potassium-40 (K-40) present in potassium chloride provides a consistent, low-level beta radiation source suitable for routine GM tube performance checks.