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radiation assessment detector
The Radiation Assessment Detector (RAD) is an instrument mounted on the Mars Science Laboratory ''Curiosity'' rover. It was the first of ten instruments to be turned on during the mission.
==Purpose==
The first role of RAD was to characterize the broad spectrum of radiation environment found inside the spacecraft during the cruise phase. These measurements have never been done before from the inside of a spacecraft in interplanetary space. Its primary purpose is to determine the viability and shielding needs for potential human travelers on a manned mission to Mars, as well as to characterize the radiation environment on the surface of Mars, which it started doing immediately after MSL landed in August 2012.〔(【引用サイトリンク】title=SwRI Radiation Assessment Detector (RAD) Homepage )〕 Turned on after launch, the RAD recorded several radiation spikes caused by the Sun.〔
RAD is funded by the Exploration Systems Mission Directorate at NASA Headquarters and Germany's Space Agency (DLR), and developed by the Southwest Research Institute (SwRI) and the extraterrestrial physics group at Christian-Albrechts-Universität zu Kiel, Germany.〔〔(NASA – RAD )〕
On 31 May 2013, NASA scientists reported the results obtained during cruise, and stated that the equivalent dose radiation for even the shortest round-trip with current propulsion systems and comparable shielding is found to be . This implies a great health risk caused by energetic particle radiation for any manned mission to Mars.〔〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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