A compact, low-power neutron energy spectrometer (NES) would accurately measure the radiation dose to astronauts. The proposed NES can measure neutron dose to higher accuracy than existing technologies, which are bulky (7-12 kg) and can suffer poor inaccuracy (>50%) because these instruments cannot differentiate thermal, epithermal, or fast neutrons from each other. A multi-channel NES would achieve improved accuracy by including neutron energy information and reducing weight.
The original NES was developed to replace aging neutron dosimeters used aboard nuclear naval vessels for the Dept. of Defense. Surveys of ships are conducted to ensure that radiation levels do not pose a danger to the crew. A handheld NES would provide more accurate feedback and be less burdensome to the operator. Similarly, an improved dosimeter is desired at the Dept. of Energy nuclear reactor locations, such as Transient Reactor Test (TREAT) facility, where operation of the reactor varies.
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