Average activation cross sections for a number of elements were determined using unmoderated neutrons from Pu-Be and Po-Be sources. Applying threshold detectors it was found that 10% of Pu-Be neutrons are emitted in the energy interval 10--100 keV. Neutron spectra from Pu-Be13 sources of different dimensions were the same within the interval 0.5--5 Ci; the majority of neutrons below 2 MeV carne from the multibody break-up of 13C.
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