Space Test Program-H4-Miniature Array of Radiation Sensors (STP-H4-MARS) - 11.22.16
Space Test Program-Houston 4-Miniature Array of Radiation Sensors (STP-H4-MARS) uses a network of 8 small radiation dosimeters to monitor the radiation experienced by a host spacecraft. The host is the STP-H4-GLADIS satellite. An STP-H4-MARS sensor includes a small circuit, which directly measures ionizing radiation from the sun and other cosmic sources. Science Results for Everyone
Information Pending Experiment Details
Andrew Nicholas, Ph.D., Naval Research Laboratory, Washington, DC, United States
Naval Research Laboratory, Washington, DC, United States
Sponsoring Space Agency
National Aeronautics and Space Administration (NASA)
Technology Demonstration Office (TDO)
ISS Expedition Duration
March 2013 - March 2015
Space Test Program-Houston 4-Miniature Array of Radiation Sensors (STP-H4-MARS) providse the radiation depth-dose profile in the vehicle, which can be directly compared with calculations using environmental models and radiation transfer computer codes.
STP-H4-MARS allows for verification of space vehicle radiation design models.
STP-H4-MARS tests and characterizes on-orbit performance of a new radiation shielding material (Demron®).
The next step in evaluating Demron® for space applications is a flight demonstration and STP-H4-MARS offers an opportunity for such testing. Even though the ISS trapped electron environment is much more benign than the GEO environment, measurements of trapped electron/proton dose to the STP-H4-MARS sensors on ISS, as a function of Demron® thickness, can provide such a flight demonstration because the ISS trapped electron/proton environment is well characterized and the measurements can be interpreted using existing high energy particle transport codes, e.g., FLUKA (a particle physics Monte Carlo simulation package). Reasonably accurate estimates of GEO performance can then follow using energetic particle transport codes in combination the standard GEO environment models.
The STP-H4-MARS investigation provides data to inform a new 3-dimensional model of radiation impact on an example payload. This verifies design parameters for spacecraft, and help researchers determine how much shielding is necessary for internal instruments and external instruments. The investigation also tests the effectiveness of a new type of radiation shield, which could be used for geosynchronous satellites.
An improved understanding of the radiation environment surrounding Earth helps determine the radiation risks for high-altitude aircraft, unmanned aerial vehicles and balloons. Understanding the ability of space flight hardware to shield against radiation helps researchers studying forms of shielding on Earth, including medical imaging electronics.
Operational Requirements and Protocols
Decadal Survey Recommendations
Information Pending^ back to top
^ back to top
Computer generated image of STP-H4.
+ View Larger Image