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All authors contributed equally A specially constructed highly-mobile electron accelerator is being developed for Intra Operative Radiation Therapy (IORT) in Poland. The aim of this work was to study the effects of different materials and geometry of accelerator head components on such critical beam properties as flatness, X-ray and neutron contamination, and the amount of dose delivered outside the treatment field. Based on these findings, a treatment head and applicators for the new mobile electron accelerator are being designed. The Monte Carlo code, BEAMnrc/EGSnrc, was used to build two models of a treatment head with plastic and metal applicators. FLUKA code was used for beam-stopper and shielding estimations. Both models fulfill basic requirements for quality of the therapeutic beam, as well as for radiation protection against stray and leakage radiation. The new aspects of our study were simulations for applicators with diameters of 15 and 22 cm for larger field intra operative treatment, which are not generally available on the market.

The lifetime of levels in 128 Cs and 132 La have been measured in-beam of the Warsaw University Cyclotron using DSA method. The absolute M1 and E2 transition probabilities have been deduced. Two cases have been found: 132 La where the B(E2) values in yrast and partner bands differ up to 30 times and 128 Cs -the B(E2) values in both bands differ only few times. It seems that bands in 128 Cs are better candidates for chiral partner bands than the ones in 132 La.