Measurement of Neutron Spectrum and Induced γ-Spectrum in Vanadium Sphere and Depleted Uranium Sphere

In-vivo neutron and gamma spectra of depleted uranium sphere and vanadium sphere under central D-T neutron source were measured，with a 18 mm×20 mm stilbene crystal detector， at 7，10，13，16，19，22 cm away to the center in 45° direction in depleted-uranium sphrer, and 1.8，4.8，8.3 cm away to the center in the 0° direction in V sphere. Simulation was carried out using MCNP code with ENDF/B-Ⅵ database, and the calculated result was compared with the measured result.