Fig. 1 Permafrost thawing during the summer in the Canadian Arctic, Melville Island (74°50'N, 109°30'W) in Nunavut, Canada, is attributed to the impacts of climate change. (Photo by Lekhnath Ghimire.) More about this image found in Permafrost thawing during the summer in the Canadian Arctic, Melville Islan...

Fig. 1 ( a ) Intrinsic neutron detection versus P neg and ( b ) threshold energy neutron analysis based SNM active interrogation with CTMFDs [ 3 – 11 ] More about this image found in ( a ) Intrinsic neutron detection versus P neg and ( b ) threshold energ...

Fig. 2 Schematic depiction of the E-ATMFD—design and operational principles [ 9 ] More about this image found in Schematic depiction of the E-ATMFD—design and operational principles [ 9 ]

Fig. 3 Schematic of active photon interrogation experiments during phase-1 2019 campaign More about this image found in Schematic of active photon interrogation experiments during phase-1 2019 ca...

Fig. 4 Variation of detection rate versus time for E-ATMFD.Ver.1 under internal vacuum and after vacuum release toward equilibrium with ambient (i.e., to operation without internal vacuum) More about this image found in Variation of detection rate versus time for E-ATMFD.Ver.1 under internal va...

Fig. 5 Schematic of experimentation layout of phase-2 (2021) tests at 9 MV LINAC facility More about this image found in Schematic of experimentation layout of phase-2 (2021) tests at 9 MV LINAC f...

Fig. 6 Variation of previously reported [ 8 , 9 ] E-ATMFD.Ver.0 count rates versus drive power for cases with and without 3.2 kg DU target (note: error bars are 1 sigma) More about this image found in Variation of previously reported [ 8 , 9 ] E-ATMFD.Ver.0 count rates versus...

Fig. 7 Variation of count rate (with DU) versus E-ATMFD.Ver.1 power level and background/bias count rate (without DU) More about this image found in Variation of count rate (with DU) versus E-ATMFD.Ver.1 power level and back...

Fig. 1 Illustration of the first benchmark problem More about this image found in Illustration of the first benchmark problem

Fig. 2 Time variations of all measurements in the first benchmark problem (without bias errors): ( a ) overall view and ( b ) expanded scale view More about this image found in Time variations of all measurements in the first benchmark problem (without...