DoSEN is an early-stage space technology research project with the sole objective of developing the concept and demonstrating the proof-of-principle of a space radiation instrument possessing unprecedented performance capabilities while requiring only minimal resources (mass, volume, power, cost). DoSEN combines two advanced complementary radiation detection concepts that present fundamental advantages over traditional radiation detectors, but requires proof-of-concept so that DoSEN may be readily implemented on future missions. DoSEN not only measures the energy but also the charge distribution (including neutrons) of energetic particles that affect human (and robotic) health in a way not presently possible with current radiation instruments. Thus, DoSEN lays the foundation for a new generation of radiation instruments for the next phase of NASA’s human and robotic exploration.More »
DoSEN not only measures the energy but also the charge distribution (including neutrons) of energetic particles that affect human (and robotic) health in a way not presently possible with current radiation instruments. Thus, DoSEN lays the foundation for a new generation of radiation instruments for the next phase of NASA's human and robotic exploration.More »
|Organizations Performing Work||Role||Type||Location|
|University of New Hampshire-Main Campus||Lead Organization||Academia||Durham, New Hampshire|
|Ames Research Center (ARC)||Supporting Organization||NASA Center||Moffett Field, California|
The sole focused objective of the DoSEN project is to demonstrate viability and benefits of coincidence LET and SiPM neutron detection. We will:
•Provide proof-of-concept for low-power SiPM neutron detection from an organic scintillator with pulse-shape discrimination.
•Provide proof-of-concept for coincident LET detection of recoil protons from the scintillator.
•Provide proof-of-concept for background suppression in LET & SiPM coincidence energy measurements of a broad range of radiation including neutrons, electrons, protons and heavy ions.
•Provide proof-of-concept for fast coincidence determination and active readout of dose, dose-equivalents, organ doses and neutron doses based on biologically determined quality factors.
The schedule for DoSEN development provides a progression of TRL advances that accrue through the project. The corresponding milestones are as follows:
•First Milestone Completed: Completed initial trade study, and procurements (scintillator, SiPMs, SSDs and TEP for lab benchtop measurement).
•Second Milestone Completed: Completed first tests using radioactive sources. Focus was made on demonstrating neutron detection enabled by SiPMs and first LET coincidence measurements including recoil protons, primary protons, and primary heavy ions. Two papers were submitted outlining the DoSEN concept and feasibility including the performance of the SiPMs.
•Third Milestone Completed: Completed design and implementation including a housing for the prototype, which enables travel for DoSEN characterization at ion/neutron beam facilities within the US.
•Fourth Milestone Completed: We have completed measurements to demonstrate neutron detection and LET coincidence, and to quantify background suppression using coincidence and initial results of fast coincidence logic. The second set of beam measurements were taken at Massachusetts General Hospital on Oct 22, 2015 with a 230 MeV proton beam. Results generally demonstrated LET coincidence and fast coincidence logic of the SiPM and silicon detectors.