IJS KOLOKVIJ, sreda, 15. 1. 2025, ob 13. uri, doc. dr. Benjamin Zorko

Nataša Goševac Natasa.Gosevac at ijs.si
Wed Jan 8 09:08:06 CET 2025



Vabimo vas na 5. predavanje iz sklopa »Kolokviji na IJS« v akademskem letu 2024/25, ki bo v sredo, 15. januarja 2025, ob 13:00 v Veliki predavalnici Instituta »Jožef Stefan« na Jamovi cesti 39 v Ljubljani. Predavanje bo v slovenščini. Na voljo bodo kava, pijača in prigrizki.

 

 

Ocenjevanje doz: od konceptualnega modela do okoljskega radiološkega monitoringa

 

doc. dr. Benjamin Zorko

Institut »Jožef Stefan«, Ljubljana, Slovenija

 

 

Radionuklidi se v okolje nadzorovano izpuščajo iz različnih jedrskih in sevalnih objektov, kar lahko potencialno škodljivo vpliva na zdravje ljudi in okolje. Če izpusti lahko povzročijo škodljive radiološke učinke, jih je treba ovrednotiti v skladu z upravnimi zahtevami in dobro prakso. Pri ljudeh učinke ocenjujemo z efektivno dozo, pri rastlinah in živalih pa s hitrostjo absorbirane doze. Za oceno efektivne doze za referenčno osebo so ključni štirje koraki: karakterizacija vira, ugotavljanje koncentracij aktivnosti radionuklidov v okoljskih medijih, upoštevanje poti izpostavljenosti in lastnosti referenčne osebe. Predvidene koncentracije aktivnosti radionuklidov v medijih, prek katerih se radioaktivnost vnese v človeško telo ali ga obdaja, ocenjujemo z modeli s kompleksnimi matematičnimi in numeričnimi algoritmi, ki ustrezajo fizikalnim procesom. Celovita ocena efektivne doze temelji na robustnem konceptualnem modelu, ki lahko usmerja operativni nadzor radioaktivnosti v okolju. Ta nadzor pri načrtovani izpostavljenosti lahko vključuje nadzor vira izpustov in nadzor radioaktivnosti v okolju, kar potrjujejo tudi primeri dobre prakse. V predavanju bom predstavil ocene efektivne doze z uporabo konceptualnega modela za primer odlaganja radioaktivnih odpadkov v morjih in v okviru nadzora radioaktivnosti v okolju.

 

O predavatelju: Benjamin Zorko je strokovno raziskovalni svetnik na Institutu »Jožef Stefan«, kjer je vodja infrastrukturnega centra za meritve ionizirajočega sevanja (ICMIS) na Odseku za fiziko nizkih in srednjih energij. Je odgovorni koordinator za pripravo ocene učinkov delovanja Jedrske elektrarne Krško ter drugih monitoringov radioaktivnosti v okolju.

 

 

Napovednik predavanja in posnetke preteklih predavanj najdete na novi spletni strani »Kolokvijev na IJS«  <https://kolokviji.ijs.si/> https://kolokviji.ijs.si/, posnetke pa tudi posebej na  <https://video.arnes.si/?q=Kolokviji_IJS> https://video.arnes.si/?q=Kolokviji_IJS (zadnje tri sezone) in  <http://videolectures.net/kolokviji_ijs> http://videolectures.net/kolokviji_ijs (starejši).

 

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We invite you to the 5th lecture in the framework of »JSI Colloquia« in the academic year 2024/25, which will take place on Wednesday, January 15, 2024, at 1:00 PM in the main lecture hall of Jožef Stefan Institute, Jamova cesta 39 in Ljubljana. The lecture will be held in Slovenian. Coffee, drinks and snacks will be available.

 

 

Dose assessment: from conceptual model to environmental radioactivity monitoring

 

Assist. Prof. Dr. Benjamin Zorko

Jožef Stefan Institute, Ljubljana, Slovenia

 

 

Radionuclides are discharged into the environment from a variety of nuclear and radiation facilities, potentially causing harmful effects on human health and the environment. If discharges are likely to result in adverse radiological effects, they must be evaluated in accordance with regulatory requirements and good practice. For humans, effects are assessed using effective dose, whereas for non-human biota, absorbed dose rate is considered. To estimate the effective dose for a reference person, four steps are essential: characterizing the source, determining radionuclide activity concentrations in environmental media, considering exposure pathways, and accounting for the characteristics of the reference person. Predicted radionuclide activity concentrations in the media through which radioactivity enters or surrounds the human body are estimated using models that employ complex mathematical and numerical algorithms resembling physical processes. The overall dose assessment is based on a robust conceptual model that can guide the operational radioactivity monitoring. In planned exposure situations, both source monitoring and environmental radioactivity monitoring may be conducted, as supported by good practice examples. In the talk, I will present effective dose estimates using a conceptual model for the case of radioactive waste disposal at sea and in the context of environmental radioactivity monitoring.

 

About the lecturer: Benjamin Zorko is a research councilor at the Jožef Stefan Institute, where he is the head of the Infrastructure Center for Ionizing Radiation Measurements (ICMIS) at the Department of Low and Medium Energy Physics. He is the coordinator responsible for preparing the impact assessment of the Krško Nuclear Power Plant and other environmental radioactivity monitoring.

 

 

The lecture trailer and recordings of past lectures can be found on the new website of »JSI colloquia«  <https://kolokviji.ijs.si/> https://kolokviji.ijs.si/, and recordings specifically at  <https://video.arnes.si/en/?q=Kolokviji_IJS> https://video.arnes.si/en/?q=Kolokviji_IJS (last three seasons) and  <http://videolectures.net/kolokviji_ijs> http://videolectures.net/kolokviji_ijs (older).

 

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