The Gamma-go workshop is one of the STEM activities of the Hong Kong Observatory’s Pilot School Community Ambient Radiation Measurement Programme. It aims to teach students the basics of radiation through lectures and practical sessions. Contents include how to assemble a portable instrument with radiation detector and meteorological microsensors on the Arduino platform to make real-time, on-site measurements of gamma radiation, air temperature, humidity, atmospheric pressure, and other meteorological elements at a community level. The data are then uploaded to the dedicated web-based Gamma-Go platform for further analysis. After the workshop, the school is given a 3D printed portable Gamma-Go device designed by the Observatory. This device enables the students to continue with the experiential learning by collecting gamma radiation and meteorological data at different places.