arXiv subjects

Izabela Skwira-Chalot

Publications and source records attributed to Izabela Skwira-Chalot.

4 recordsLinked to original sources

arXiv2025

Influence of $^{13}$C on proton-induced $^{13}$N production from natural carbon target

Two recent measurements of $^{12}$C(p,$γ$)$^{13}$N reaction on natural carbon were performed by detecting $β^+$ decay of $^{13}$N residue. It is argued that the measurements at energies above the $^{13}$C(p,n)$^{13}$N reaction threshold of 3.24 MeV proton kinetic energy can be interpreted as a consequence of 1.06\% admixture of $^{13}$C isotope in natural carbon, as the cross section for $^{13}$N production raised by 3 orders of magnitude with respect to the measurements of $^{12}$C(p,$γ$)$^{13}$N at lower energies.

nucl-ex↗

arXiv2025

$β^+$ radioactive nuclei created during proton therapy

During proton therapy, the beam flux decreases due to inelastic interactions with nuclei. At the highest energies used in proton therapy around 25\% protons initiate nuclear reactions. This report presents the cross section measurements of proton-induced production of three $β^+$ emitters -- $^{11}$C, $^{13}$N, $^{15}$O -- with half-lives between 2 and 20 minutes, using solid C, BN and SiO$_2$ targets. Stacks of up to 15 targets were irradiated simultaneously with proton beams of kinetic energy below 58 MeV at the AIC-144 cyclotron of the Institute of Nuclear Physics, Polish Academy of Sciences. The measured cross sections follow the excitation function obtained in the previous experiments, with uncertainty of a few percent.

nucl-ex↗

arXiv2018

Measurement of proton-induced radiation in animal tissue

Hadron therapy, because of the dosimetric and radiobiological advantages, is more and more often used in tumour treatment. This treatment method leads also to the radioactive effects induced by energetic protons on nuclei. Nuclear reactions may lead to the production of radioactive isotopes. In the present experiment, two animal (human-like) tissue samples were irradiated with 60 MeV protons. Gamma-ray spectroscopy and lifetime measurements allowed identifying isotopes produced during the irradiation, e.g. $^{18}$F and $^{34m}$Cl.

physics.med-ph↗

arXiv2018

Application of instruments of nuclear physics to the calculation of theoretical dose distributions in various organs of the human body for beams used in hadrontherapy

The area of interests of nuclear physics are studies of reactions, wherein atomic nuclei of projectile collide with target nuclei. An amount of energy lost by projectile nucleus during its passing through the target is a major issue - it is important to know how charged particles interact with matter. It is possible to afford this knowledge by using theoretical programs, which calculate energy loss applying Bethe-Bloch equation. Hadrontherapy, which is a field of still growing interest, is based on interactions of charged particles with matter. Therefore exists a need of creating a simple model, which could be used to the calculation of dose distributions in biological matter. Two programs (SRIM, Xeloss), used to the calculation of energy loss by nuclear physicist, have been adapted to determine dose distributions in analogs of human tissues. Results of the calculations with those programs for beams used in hadrontherapy (e.g. $^1$H, $^{12}$C) will be compared with experimental data available in references.

physics.med-ph↗