The payload sub-team is responsible for the implementation of a payload that will take advantage of the conditions that occur during flight (altitude change, temperature, the composition of the air etc.) so that it might justify its inclusion inside the rocket. Of course, there could be more than one experiment that even has a different scientific interest, as long as there is enough space to include them.
For the new project Selene Payload sub-team chose to study environmental radioactivity. The experiment aims to observe the alteration in the concentration of Radon (Rn-222), a radioactive element, in the lower layers of the atmosphere. To succeed the team is going to construct a detection system that measures the amounts of radiation all along the trajectory of the rocket. More specifically, a CubeSat structure will house the experimental set up and once the rocket reaches its apogee, using a drogue parachute it will follow a separate path. Now without the rocket’s tube blocking incoming radiation it will freely make measurements. The Payload will descent independently from the rocket and thus it is essential to implement a Global Positioning System (GPS) (asat.gr/projects/rocketry/rocketry-subsystems/avionics-sub-team), as well as all of the electronics to acquire and store data.
When the payload reaches the ground, the experiment will come to an end. A comparison with the altitude, that each measurement was taken will be made, thus the team will be able to determine the alteration of Rn-222 in accordance to altitude. The data will be processed during the flight with a program developed by the team. Finally they will be stored in a SD card and send using a telemetry feature that avionics (asat.gr/projects/rocketry/rocketry-subsystems/avionics-sub-team) is planning on developing.
The experimental set up hasn’t been determined yet and thus can’t be visualized. The sub-team member are still researching the various detection systems to make and informed decision.