Our STEM school team members have joined the Gamma-Go Workshop organized by the Hong Kong Observatory. In the workshop, students were introduced basic concept related to radiation in our daily lives. They built a radiation detection device using Arduino Boards and various sensor components. They also had a chance to try out their device by finding natural radioactive sources hidden in the school campus. It has been a great opportunity for our students to learn beyond the regular classroom. In the coming future, they will also use a similar device to help collect radiation data in Hong Kong and contribute to the radiation monitoring work of the Hong Kong Observatory.