Gap Acute - 5: What are the optimal SPE alert and dosimetry technologies? (Closed. Technology maturation transferred to Advanced Exploration Systems)
Last Published:  03/29/18 08:54:54 AM (Central)
Responsible Element: Space Radiation (SR)
Status: Closed
Closure Rationale
The space radiation measurement and dosimetry technology development and maturation responsibility was transitioned to the Advanced Exploration Systems (AES) Program RadWorks Project in December of 2012.  By 2011 the development of Solar Particle Event (SPE) alert and dosimetry technologies had reached a high level of maturity under the Space Radiation Project Element therefore the HRP external Standing Review Panel in 2011 recommended that this development no longer fell under the research category, and this responsibility was transferred to AES. 
Closure Documentation:
No Closure Documentation Available

  1. Initial State

    During SPEs, a variety of mission scenarios can require advanced monitoring technologies to assure proper operational responses to the dynamic radiation environment presented over the course of a SPE. Real-time area radiation monitors are utilized in spaceflight; however, further development is needed for active crew personnel dosimetry, including methods to incorporate dosimetry into extra-vehicular spacesuits or extravehicular activity (EVA) toolboxes. Spacesuits or vehicle radiation detectors will be constrained by mass, volume, power, and data transmission requirements.

  2. Target for Closure:  Deliver  SPE alert and monitoring dosimetry technologies to the Advanced Exploration Systems (AES) program meeting the requirements specified in the Customer-Supplier Agreement between HRP and AES.
  3. Interim Stages (Metrics)

    • Determine Dosimetry Requirements and Technology for EVA (20%)- completed.
    • Develop EVA Dosimetry (40%) – completed.
    • Develop EVA Alert Dosimetry (40%)-completed.
  4. Approach

    Ground-based, peer-reviewed research to develop dosimetry systems for monitoring human exposures during spaceflight missions. Dosimeters that respond to variable dose-rates and within the LET range of an SPE are a priority.


  1. Lunar EVA Dosimetry: Design of a Radiation Dosimeter for Astronauts During Lunar Extravehicular Activities – Completed and Prototype Delivered February 2012 (Borak, NSBRI)
  2. Lunar EVA Dosimetry: Microdosimeter-Dosimeter Instrument- Delivery Milestone 06/30/2013 (Ziegler NSBRI)
  3. Radiation Alert Immediate Disclosure (RAID) Delivery Milestone: 1/31/2014  (Krug, SBIR Phase II)

Delivery Milestones:

Lunar Dosimetry Requirements Ground Study (2007)

Spectroscopic Dosimeter (2010)

Tissue-Equivalent Radiation Dosimeter-On-A-Chip (2010)

Lunar EVA Dosimetry: Small Active Dosimetry System for Lunar Extravehicular Activity Missions: Spacesuit and Tool-Box Applications (4/2012)

Target for Closure
No Target for Closure available.
Risk Risk of Acute Radiation Syndromes Due to Solar Particle Events (SPEs)
You are here! Gap Acute - 5: What are the optimal SPE alert and dosimetry technologies? (Closed. Technology maturation transferred to Advanced Exploration Systems)

No Documentation Available