Total photoabsorption cross sections for H-1, H-2 and He-3from 200 to 800 MeV

The total photoabsorption cross sections for 1H, 2H, and 3He have been measured for incident photon energies ranging from 200 to 800 MeV. The 3He data are the first for this nucleus. By using the large acceptance detector DAPHNE in conjunction with the tagged photon beam facility of the MAMI accelerator in Mainz, cross sections of high precision have been obtained. The results show clearly the changes in the nucleon resonances in going from 1H to 3He. In particular, for the D13 region the behavior for 3He is intermediate between that for 1H, 2H, and heavier nuclei. This will provide a strong constraint to the theories that are presently being developed with a view to explaining the apparent ‘‘damping’’ of higher resonances in heavy nuclei

Boron concentration imaging for BNCT

none14A precise knowledge of the boron concentration, both in tumor and healthy tissues, is an essential requirement for the BNCT treatment of cancer. Many methods can be used to detect the boron signal coming from biological samples, but it is very important to know what type of tissues are present in the sample. In the case of liver metastases, for example, tumor cells are disseminated through the healthy tissues. Tumor cells, normal hepatocytes, blood cells and necrotic material can be simultaneously present inside a metastatic nodule having a diameter of a few millimeters . In this paper we show the results of the analysis of tumor samples from human liver infused by BPA that was performed using neutron radiography. We have found that the boron concentration is very different in the various biological materials. This demands to take into account the morphology of the sample for the correct evaluation of the boron concentration.S. Altieri; A.Braghieri; S. Bortolussi; P. Bruschi; F.Fossati; P. Pedroni; T.Pinelli; A. Zonta; C.Ferrari; U.Prati; L.Roveda; S.Barni; P.Chiari; R.NanoAltieri, Saverio; Braghieri, Alessandro; Bortolussi, Silva; Bruschi, Piero; Fossati, Francesca; Pedroni, Paolo; Pinelli, Tazio; Zonta, Aris; Ferrari, Cinzia; U., Prati; L., Roveda; Barni, Sergio; Chiari, Patrizia; Nano, Rosann

Boron concentration imaging for BNCT

A precise knowledge of the boron concentration, both in tumor and healthy tissues, is an essential requirement for the BNCT treatment of cancer. Many methods can be used to detect the boron signal coming from biological samples, but it is very important to know what type of tissues are present in the sample. In the case of liver metastases, for example, tumor cells are disseminated through the healthy tissues. Tumor cells, normal hepatocytes, blood cells and necrotic material can be simultaneously present inside a metastatic nodule having a diameter of a few millimeters . In this paper we show the results of the analysis of tumor samples from human liver infused by BPA that was performed using neutron radiography. We have found that the boron concentration is very different in the various biological materials. This demands to take into account the morphology of the sample for the correct evaluation of the boron concentration