Determination of the experimental yield of 99mTc in (p,2n) nuclear reaction on enriched 100Mo sample with application of 11-MeV medical cyclotron.

This paper presents the measured thick target yield of 99mTc from molybdenum sample with 92.2% enrichment in 100Mo isotope via the (p,2n) nuclear reaction channel. The yield was determined experimentally with application of the 11-MeV medical cyclotron Eclipse RD, equipped with a new target assembly developed for solid sample irradiations. The experimental physical yield was measured to be 30.9 ± 1.3 MBq/µAh. This result was compared with theoretical calculations and results of other authors. The features of irradiation conditions that may have an influence on produced activity were studied and analyzed.

Measurements and calculations of neutron spectra modified by iron slabs bombarded by neutrons with energies up to 14 MeV.

Neutron spectra behind iron slabs of different thicknesses have been measured in the energy range from 1.6 to 14 MeV using a proton recoil spectrometer and 2H(d, n)3He and 9Be(d, n)10B neutron sources. The measured results have been compared with the predicted ones using the three dimensional Monte Carlo code MCNP 4A and pointwise cross sections from the ENDF/B-IV and ENDF/B-VI data files. The results show that the ENDF/B-IV calculations are in better agreement with the experiment than those obtained by using the ENDF/B-VI cross section data.