In the last three years, GAO has completed TA reports on three topics, the most recent one being released in 2011 rail security, climate engineering, and alternate neutron detectors.
32.
Fast neutron detectors have the advantage of not requiring a moderator, and therefore being capable of measuring the neutron's energy, time of arrival, and in certain cases direction of incidence.
33.
Its major components are left over from other decommissioned experiments : 76 tons of lead from an earlier cosmic-ray experiment, and 128 three-metre-long helium-3 neutron detectors from the Sudbury Neutrino Observatory.
34.
The gamma-ray spectrometer used on the Odyssey spacecraft consists of four main components : the gamma sensor head, the neutron spectrometer, the high energy neutron detector, and the central electronics assembly.
35.
The reactor fully and effectively scrammed immediately on detecting these supply failures, however staff relied on neutron detector readings to determine reactor state due to lack of information on control rod state.
36.
Since the soil's moisture level is partly responsible for its in-place density, the gauge also contains a neutron moisture gauge consisting of an americium / beryllium high-energy neutron source and a thermal neutron detector.
37.
Due to its high 6 Li density this material is suitable for producing light weight compact neutron detectors, as a result LiCaAlF 6 has been used for neutron detection at high altitudes on balloon missions.
38.
The basis for this increase in efficiency was a computer-based system called the Core Operating Limit Supervisory System ( COLSS ), which leveraged almost 300 in-core neutron detectors and a patented algorithm to allow higher power densities.
39.
There were also several gamma ray and neutron detectors, although few survived the blast, with all the gauges within of ground zero being destroyed, however sufficient data were recovered to measure the gamma ray component of the ionizing radiation released.
40.
Since reaching this fourth orbit in December 2015, " Dawn " was scheduled to acquire data for the next three months with its gamma-ray and neutron detector ( GRaND ) and other instruments that will determine the chemical elements at the surface.
