Low-cost detector tracks constant cosmic particle flux on Earth

A compact detector priced at roughly $100 can now record the continuous flow of cosmic particles that permeate the planet and even pass through the human body. The handheld instrument, originally conceived as a university physics project, is sensitive enough to capture muons and other secondary particles generated when high‑energy cosmic rays strike Earth’s atmosphere, providing researchers with real‑time data on a phenomenon that was previously observable only with large, expensive apparatuses.

Since its debut, the detector has been incorporated into a range of scientific endeavors, from ground‑based particle‑physics experiments to high‑altitude balloon flights that study atmospheric radiation. Its low cost and portability have also attracted interest from space agencies exploring payload options for future spacecraft, where continuous monitoring of cosmic radiation could improve mission safety and scientific return. The device’s transition from a classroom prototype to a tool used in major research programs underscores its potential to democratize particle detection and expand our understanding of the invisible radiation environment surrounding Earth.