Tissue-Equivalent Space Radiation Dosimeter

RMD has designed and fabricated a prototype active, lightweight, and compact dosimeter comprised of a tissue-equivalent plastic scintillator coupled to a solid-state photomultiplier (SSPM). The SSPM consists of an array of Geiger photodiodes (GPDs) built using complementary metal-oxide semiconductor (CMOS) structures. The dosimeter provides a tissue-equivalent response to the relevant energies and types of radiation encountered during low-Earth orbit and interplanetary space flight to the Moon or Mars.

The instrument will be sensitive to the dose rates and particle fluxes from ambient Galactic Cosmic Rays (GCR) and to enhanced rates of major SPEs. The dosimeter will complement the existing Crew Passive Dosimeter (CPD) by providing real-time dosimetry and as an alarming monitor for SPE.

The picture below shows the final prototype, which measures the cumulative dose and dose rate by collecting and storing the scintillator spectral information.