Speaker
Description
A space radiation microdosimetric prototype has been developed as a real-time sandwich pixel detector system for studying radiation effects on human cells. The system employs two silicon pixel detectors arranged in a stacked geometry, with a microfluidic chip for cell culture positioned between them. By exploiting the high spatial resolution of the pixel detectors and their event-by-event digital measurement of energy deposition, the prototype supports micrometer-scale correlation of particle incidence positions and deposited energy. Each detector features a 10-μm-thick sensitive layer, a pixel pitch of 6.5 × 6.5 μm2, and a 2048 × 2048 pixel matrix. To support the stacked configuration, a modular and synchronized real-time readout system is implemented based on a Xilinx Zynq UltraScale+ MPSoC platform. The system integrates multi-rail detector power supply, detector configuration, precise timing control, data alignment and training, continuous image acquisition, and high-speed data transmission. Background measurements show stable dark data performance, with row-wise mean values uniformly distributed between of 5 and 7 digital number (DN) and RMS noise below 0.5 DN for most rows, indicating good baseline stability and noise uniformity. Preliminary laboratory tests using 60Co and 90Sr sources show consistent energy peak positions between the upper and lower detectors, while differences in counting rates are observed. Future work will focus on precise spatial synchronization and accelerator-based energy calibration using proton beams of different energies to establish correlations among particle events recorded by the stacked detectors.
| Minioral | Yes |
|---|---|
| IEEE Member | No |
| Are you a student? | Yes |