Speaker
Description
Cosmic radiation can be divided into GCR (Galactic Cosmic Radiation) originating from outside the solar system, SCR (Solar Cosmic Radiation) originating from the Sun, and trapped particles in the Van Allen belt. Cosmic radiation is a high-energy particle that has a significant impact on satellites and humans operating in space. In particular, when cosmic radiation passes through electronic components, the electronic components absorb the energy of the radiation, causing effects such as TID (Total Ionizing Dose), SEE (Single Event Effect), and DDD (Displacement Dose Damage). This study analyzes the TID impact of COTS (Commercial Off-The-Shelf) OBC (On Board Computer) and MCU (MicroController Unit) such as Arduino (YUN, UNO, PICO, DUE, etc.), Raspberry Pi (CM3, CM4, etc.), LattePanda, and Nucleo among electronic components. Furthermore, to ensure that COTS products can physically reduce absorbed doses, various types of shields were designed and simulated using Gean4 (GEometry ANd Tracking) and MCNP6.2 (Monte Carlo N-Particle). 1-layer shield is composed of one of seven materials (Al, Fe, Cu, Ni, Ti, Pb, W), and compare the change in absorbed dose reduction. The 2-layer shield adds a 4mm Aluminum layer to the front of 1-layer shield, emulating an actual satellite’s outer wall. The 3-layer shield adds a BPE (Borated Polyethylene) to the back of 2-layer shield to reduce neutron flux. Geant4 and MCNP6.2 were used for shield design and simulation, and the results of the two programs were compared. In general, the higher density of the material can shield more efficiently, and it was confirmed that the results of the two programs differed by at least 2% and up to 19%.
