Month: May 2019

Graduate Seminar, 3rd June

Speaker: Szymon Domański

Title: Dosimetry for radiation processing

Abstract: Radiation processing is a growing industry, and is commonly used in the sterilization of medical products for example, sutures, surgical gloves, gowns, face masks, syringes, sticking plasters, dressings and other single use healthcare supplies are all processed using gamma radiation. The use of ionizing radiation for these purposes does not make the underlying product radioactive, and generally has no effects on it that are any more pronounced than other sterilization or preservation technologies. Standards for radiation sterilization of medical and some other products are set by the International Organization for Standardization. In 1995, the ISO released the first edition of ISO-11137 outlining validation methods, quality controls and requirements for all activities related to the sterilization processes. In my presentation I will describe our dosimetry system developed for purposes of irradiation a variety of materials with spent nuclear fuel . I am going to present also current state of compliance with the standards.

Graduate Seminar, 27th May

Speaker: Artem Poliszczuk

Title: AGN selection in the AKARI NEP deep field with the fuzzy SVM algorithm

Abstract: In my presentation I will describe a new catalog of reliable AGN candidates selected from the AKARI NEP-Deep field. Selection of the AGN candidates was done by applying a fuzzy SVM algorithm, which allows to incorporate measurement uncertainties into the classification process. The training dataset was based on the spectroscopic data available for selected objects in the NEP-Deep and NEP-Wide fields. The generalization sample was based on the AKARI NEP-Deep field data including objects without optical counterparts and making use of the infrared information only. A high quality catalog of previously unclassified 275 AGN candidates was prepared.

Graduate Seminar, 13th May

Speaker: Oleg Shkola

Title: Search for heavy charged particles at CMS

Abstract: Many extensions of the Standard Model (SM) predict the existence of heavy, long-lived charged particles (HSCPs). These particles might have speed significantly less than speed of light and/or charge, not equal to ±1e. With lifetimes greater than a few nanoseconds, HSCPs  can travel distances larger than the typical collider detector and appear stable like pions or kaons. Because particle identification algorithms at hadron collider experiments generally assume signatures characteristic of Standard Model (SM) particles, e.g., speed close to the speed of light and a charge of ± 1e, HSCPs may go unidentified. A further complication arises from the fact that HSCPs might be charged during only a part of their passage through detectors, further limiting the ability of standard algorithms to identify them. It is however possible to detect HCPs making use of their higher rate of energy loss via ionization (dE/dx) and longer time of flight to the outer detectors, in comparison with SM particles. During the seminar, results of dedicated searches, done at Compact Muon Solenoid (CSM) experiment on data collected during 2016 will be discussed along with the improvements to the muon timing calculations done by the CMS Warsaw group.