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2 2010

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Nuclear data for the cyclotron production of 66Ga, 86Y, 76Br, 64Cu and 43Sc in PET imaging

Sadeghi M., Enferadi M., Aref M., Jafari H.

Nukleonika

2010

Vol. 55, No. 3

293-302

Positron emission tomography (PET) is a powerful diagnostic tool, which provides superior spatial resolution and an opportunity to obtain quantitative information concerning distribution of radioactivity in vivo. Most interesting positron emitters for the purpose of diagnose are 64Cu, 124I, 18F, 86Y, 48V, 52Mn, 140Pr, 72As, 74As, 89Zr, 82Sr, 68Ga, 66Ga, 45Ti, 76Br and 82Rb. Aim of the presented study is to compare the calculated cross sections of several radioisotopes of positron emitters as follows 86Y, 43Sc, 64Cu, 66Ga and 76Br with incident proton energy up to 30 MeV. In this work, excitation function of positron emitters via the 86Sr(p,n)86Y, 43Ca(p,n)43Sc, 66Zn(p,n)66Ga, 64Ni(p,n)64Cu and 76Se(p,n)76Br reactions were calculated by ALICE/ASH 0.1 (GDH model and hybrid model) and TALYS-1.2 (equilibrium and pre-equilibrium) codes and compared to existing data. Requisite for optimal thicknesses of targets were obtained by the stopping and range of ions in matter (SRIM) code for each reaction.

Dynamical modeling and excitation reconstruction as fundamental of Earth rotation prediction

Zotov L. V.

Artificial Satellites : Journal of Planetary Geodesy

2010

Vol. 45, No. 2

95--110

Though pure mathematical approximations such as regression models and neural networks show good results in Earth rotation forecasting, dynamical modeling remains the only base for the physically meaningful prediction. That assumes the knowledge of cause-effect relationships and physical model of the rotating Earth. Excitation reconstruction from the observed Earth orientation parameters (EOP) is a crucial stage, needed for comparison with known causes, such as tidal forcing, atmospheric (AAM), oceanic (OAM) angular momentum changes, and uncovering unknown ones. We demonstrate different approaches, which can be used to avoid ill-conditionality and amplification of noises during the inversion. We present amplitude and phase studies of the model and reconstructed excitations of Chandler wobble. We found out, that modulation of Chandler excitation is synchronous with 18-yr tidal effects in the Earth's rotation rate changes. The results of the study can be used for excitation and EOP forecast. The key issues of the EOP prediction are discussed.