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Simulations of γ quanta scattering in a single module of the J-PET detector

Szymański K., Moskal P., Bednarski T., Białas P., Czerwiński E., Giergiel K., Kapłon Ł., Kochanowski A., Korcyl G., Kowal J., Kowalski P., Kozik T., Krzemień W., Molenda M., Moskal I., Niedźwiecki S., Pałka M., Pawlik-Niedźwiecka M., Raczyński L., Rudy Z., Salabura P., Gupta-Sharma N., Silarski M., Słomski A., Smyrski J., Strzelecki A., Witkowski P., Wiślicki W., Zieliński M., Zoń N.

Bio-Algorithms and Med-Systems

2014

Vol. 10, no. 2

71--77

This article describes the simulations of the scattering of annihilation γ quanta in a strip of a plastic scintillator. Such strips constitute the basic detection modules in a newly proposed positron emission tomography (PET), which utilizes plastic scintillators instead of inorganic crystals. An algorithm simulating the chain of Compton scatterings was elaborated and a series of simulations have been conducted for the scintillator strip with a cross-section of 5×19 mm. The results indicate that secondary interactions occur only in the case of about 8% of the events and only 25% of these events take place in the distance larger than 0.5 cm from the primary interaction. Also, the light signals produced at the primary and secondary interactions overlap with the delay, the distribution of which is characterized by a full width at half-maximum (FWHM) of about 40 ps.

Uniqueness of studies on electron densities in the extended momentum space

Kontrym-Sznajd G.

Nukleonika

2013

Vol. 58, No. 1

203-206

This work draws attention to the fact that by measuring electronic structure via angular correlation of positron radiation (ACAR) and Compton scattering experiments one probes electron densities in the extended momentum space, directly related to the electron Bloch wave functions. Presenting some examples of electron densities in the extended and reduced momentum spaces, it is demonstrated what kind of information concerning the electronic structure can be obtained depending on the considered space. It is also shown how the knowledge of the symmetry selection rules allows to separate various Fermi surfaces and establish Fermi momenta.

Metody korekcji zniekształceń rentgenowskich krzywych dyfrakcyjnych polimerów

Rabiej M., Rabiej S.

Czasopismo Techniczne. Mechanika

2006

R. 103, z. 6-M

415-418

W pracy opisano metody korekcji rentgenowskich krzywych dyfrakcyjnych polimerów zastosowane w programie komputerowym WAXSFIT. Korekcja obejmuje redukcję szumów spowodowanych statystycznie przypadkowymi zakłóceniami procesu rejestracji oraz eliminację promieniowania Comptona i promieniowania tła.

The paper presents the methods of corrections of X-ray diffraction curves of polymers employed in the computer program WAXSFIT. The corrections cover the reduction of noises caused by random disruptions of registration process and elimination of background and Compton scattering.