1. Radiation hardness characterization of silicon photomultipliers for next-generation particle identification detectorsBoris Gardinovački, Dania Consuegra Rodríguez, Rok Dolenec, Tinka Drozdek, Peter Križan, Samo Korpar, Andrej Seljak, Rok Pestotnik, 2026, objavljeni znanstveni prispevek na konferenci Ključne besede: cryogenic detectors, foton detector, radiation-hard detectors, Cherenkov detectors, silicon photomultiplier
Objavljeno v DiRROS: 04.06.2026; Ogledov: 121; Prenosov: 85
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2. Radon concentration variability and microclimate controls in two Slovene show cavesStanka Šebela, Miloš Briestenský, Uroš Novak, 2026, izvirni znanstveni članek Povzetek: The study presents 8-years long dataset (2017–2025) of high-resolution radon concentration measurements in Županova Jama and 2-years long dataset (2022–2024) in Postojnska Jama. Radon concentrations from two show caves were compared with outside and cave air temperature as well as atmospheric pressure to assess diurnal and seasonal variability. Županova Jama showed consistently higher radon levels with a 2023 mean of 4030 Bq/m³, compared to 2278 Bq/m³ in Postojnska Jama. Diurnal variations occurred in both caves, with night values typically higher in Županova Jama, while Postojnska Jama displayed day and night concentrations more balanced depending on ventilation regimes. In Postojnska Jama, summer radon maxima followed outside air temperature peaks with a 12–18 h lag. Seasonally, both caves showed higher radon concentrations in summer and lower in winter. Long-term monitoring near Županova Jama revealed an increase in mean outside air temperature (+0.86 °C from 2018 to 2024) and a parallel rise in radon, particularly in 2023–2024. The influence of atmospheric pressure was found to be seasonally dependent at both sites, with higher radon concentrations during periods of stable summer pressure and lower values during higher winter oscillations. Exposure limits indicate safe annual times of 512 h for Postojnska Jama and 284–289 h for Županova Jama, values not hazardous for visitors but important for cave guides. The findings underline the importance of continuous monitoring and cave-specific ventilation management to mitigate long-term health risks.
Ključne besede: radon concentration, air temperature, atmospheric pressure, radiation exposure levels, Postojnska
jama, Županova Jama, Slovenia
Objavljeno v DiRROS: 24.05.2026; Ogledov: 150; Prenosov: 153
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5. Pediatric interventional neuroradiology : opportunities and challengesCene Jerele, Dimitrij Lovrič, Dimitrij Kuhelj, 2023, pregledni znanstveni članek Povzetek: Pediatric interventional neuroradiology (PINR) is a relatively new field of diagnostic and therapeutic care in the pediatric population that has seen considerable advances in recent decades. However, it is still lagging behind adult interventional neuroradiology due to a variety of reasons, including the lack of evidence validating pediatric-specific procedures, the relative absence of pediatric-specific equipment, and the challenges in establishing and maintaining PINR competencies in a relatively small number of cases. Despite these challenges, the number and variety of PINR procedures are expanding for a variety of indications, including unique pediatric conditions, and are associated with reduced morbidity and psychological stigma. Continued technological advances, such as improved catheter and microwire designs and novel embolic agents, are also contributing to the growth of the field. This review aims to increase awareness of PINR and provide an overview of the current evidence base for minimally invasive neurological interventions in children. Important considerations, such as sedation, contrast agent use, and radiation protection, will also be discussed, taking into account the distinct characteristics of the pediatric population. The review highlights the usefulness and benefits of PINR and emphasizes the need for ongoing research and development to further advance this field.
Ključne besede: pediatric interventional radiology, endovascular procedures, neuroradiological interventions, pediatric-specific interventional techniques, radiation protection
Objavljeno v DiRROS: 14.01.2026; Ogledov: 452; Prenosov: 304
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6. Midseptal and anteroseptal accessory pathway ablation in childrenLászló Környei, Matevž Jan, Mohammad Ebrahim, Vjekoslav Radeljić, Mirta Rode, 2024, izvirni znanstveni članek Povzetek: Objectives: The goal of this study is to document outcomes of ablation for high-risk accessory pathways in paediatrics using 3D mapping systems with minimal to zero fluoroscopy. Methods: It is a cross-sectional, multicentre study, conducted between 2013 and 2023, and involving four different centres in Hungary, Croatia, Kuwait, and Slovenia. Results: A total of 128 procedures were performed on 111 patients. The cohort included 57.8% anteroseptal (AS) pathways and 42.2% midseptal (MS) pathways. The mean follow-up time was 2.0 ± 2.1 years. Cryoablation was used in 72.7% of the cases, and radiofrequency ablation was used in 27.3%. The EnSite Precision™ Cardiac Mapping System was the predominant system used. The overall acute success rate was 89.1%, with recurrence rates at 17.2% with similar results regardless of the type of energy used. The success rate was not significantly different between AS and MS substrates. The age and weight of the patient had no bearing on the outcomes (median age and weight were 13 years and 52 kg, respectively). The complications rate was at 4.69% and included transient AV block (three patients), hematoma (one patient), right bundle branch block (one patient), and possible permanent complete AV block (one patient). Fluoroscopy was utilized in 18 cases, with a fluoroscopy time mean of 3 min and 45 s. Conclusions: MS and AS AP in paediatric patients can be treated effectively with either RF or cryoablation and with a low dose of radiation using 3D mapping systems, with excellent acute success rates and low complication rates.
Ključne besede: accessory pathway, electrophysiology, radiation dose, cryoablation, heart block
Objavljeno v DiRROS: 22.12.2025; Ogledov: 963; Prenosov: 292
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7. Study of the neutron radiation hardness of MAPD-3NK2 silicon photomultipliersKlemen Ambrožič, Anže Jazbec, M. Holik, S. Nuruyev, F. Ahmadov, G. Ahmadov, O. Okhrimenko, A. Mammadli, A. Sadygov, Z. Sadygov, 2025, izvirni znanstveni članek Povzetek: The radiation hardness of MAPD-3NK2 photodiodes with deep-buried pixel structures was evaluated under neutron irradiation at fluences ranging from 3.6 × 109to 3.6 × 1012neq/cm². Irradiation induced dark current increase of up to 2060 times, a breakdown voltage shift of (0.37 ± 0.08) V, a photo signal amplitude reduction of (90.1 ± 0.4) %, and a tenfold degradation in amplitude resolution. Partial recovery was observed after 40 days of room-temperature annealing, with dark current decreasing by 35%.Similar performance changes were observed in photodiodes with artificially elevated dark current, indicating that excess current is the primary driver of degradation. This current likely impedes photoelectron detection by occupying pixels or failing to fully quench the avalanche process, thereby reducing photocurrent.
Ključne besede: neutron irradiation, radiation hardness, silicon photomultipliers, photodiodes, dark current degradation
Objavljeno v DiRROS: 26.11.2025; Ogledov: 790; Prenosov: 303
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8. Sequencing of chemotherapy in total neoadjuvant treatment for rectal cancer does not predict radiation-induced lymphopeniaMiha Oražem, Vaneja Velenik, Alojz Ihan, 2025, izvirni znanstveni članek Povzetek: Radiation-induced lymphopenia (RIL) is associated with an increased risk of death in solid tumors, including rectal cancer. The aim of this study was to determine whether the sequencing of chemotherapy in total neoadjuvant treatment (TNT) for rectal cancer predicts the development of RIL. Patients and methods We analyzed acute hematologic toxicity data from 53 patients who underwent TNT for locally or locoregionally advanced rectal cancer between July 2022 and April 2023. Twenty-eight patients received induction chemotherapy with capecitabine and oxaliplatin [CAPOX], and 25 received consolidation chemotherapy (6 cycles of CAPOX in both groups). The chemoradiation protocol consisted of Volumetric Modulated Arc Therapy with Simultaneous Integrated Boost Radiotherapy (VMAT-SIB RT) up to 48.4 Gy in 22 fractions, concomitantly with capecitabine twice a day (lat. bis in die, BID). The Mann-Whitney U test was performed to compare RIL between the two patient groups. Pelvic bone marrow was contoured as a non-limiting organ-at-risk to assess the received dose, and binary logistic regression was used to determine whether RIL depends on V5Gy~V42Gy or the planning target volume (PTV) size. Results Thirty-four patients (64.2%) developed RIL of any grade, which was not significantly associated with either the induction or consolidation chemotherapy TNT regimen (Wald = 3.159, p = 0.076). No significant differences were found in neutrophil counts or the neutrophil-to-lymphocyte ratio. In the logistic regression model predicting the likelihood of RIL, two variables were statistically significant: V10Gy (Wald = 4.366, p = 0.037) and V30Gy (Wald = 6.084, p = 0.014). These results indicate that V10Gy< 71% and V30Gy< 26.6% may reduce the likelihood of developing RIL. Conclusions In our study, the sequencing of chemotherapy in TNT for rectal cancer did not predict the development of RIL. However, the incidence of RIL may be reduced by applying RT dosimetric constraints to the pelvic bone marrow.
Ključne besede: radiation-induced lymphopenia, rectal cancer, total neoadjuvant treatment
Objavljeno v DiRROS: 26.11.2025; Ogledov: 761; Prenosov: 170
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9. Molecular shield for protection of buckwheat plants from UV-B radiationIvan Kreft, Alena Vollmannová, Judita Lidiková, Janette Musilová, Mateja Germ, Aleksandra Golob, Blanka Vombergar, Darja Kocjan Ačko, Zlata Luthar, 2022, pregledni znanstveni članek Povzetek: Tartary buckwheat (Fagopyrum tataricum (L.) Gaertn.) and common buckwheat (Fagopyrum esculentum Moench) are adapted to growing in harsh conditions of high altitudes. Ultraviolet radiation at high altitudes strongly impacts plant growth and development. Under the influence of ultraviolet radiation, protecting substances are synthesized in plants. The synthesis of UV-B defense metabolites is genetically conditioned, and their quantity depends on the intensity of the ultraviolet radiation to which the plants and plant parts are exposed. These substances include flavonoids, and especially rutin. Other substances with aromatic rings of six carbon atoms have a similar function, including fagopyrin, the metabolite specific for buckwheat. Defensive substances are formed in the leaves and flowers of common and Tartary buckwheat, up to about the same concentration in both species. In comparison, the concentration of rutin in the grain of Tartary buckwheat is much higher than in common buckwheat. Flavonoids also have other functions in plants so that they can protect them from pests and diseases. After crushing the grains, rutin is exposed to contact with the molecules of rutin-degrading enzymes. In an environment with the necessary humidity, rutin is turned into bitter quercetin under the action of rutin-degrading enzymes. This bitterness has a deterrent effect against pests. Moreover, flavonoids have important functions in human nutrition to prevent several chronic diseases, including obesity, cardiovascular diseases, gallstone formation, and hypertension.
Ključne besede: buckwheat, rutin, quercetin, flavonoid, secondary metabolites, UV radiation, altitude, climatic change
Objavljeno v DiRROS: 19.11.2025; Ogledov: 575; Prenosov: 329
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10. Defluorination of polytetrafluoroethylene surface by hydrogen plasmaAlenka Vesel, Dane Lojen, Rok Zaplotnik, Gregor Primc, Miran Mozetič, Jernej Ekar, Janez Kovač, Marija Gorjanc, Manja Kurečič, Karin Stana-Kleinschek, 2022, samostojni znanstveni sestavek ali poglavje v monografski publikaciji Ključne besede: polytetrafluoroethylene, fluorine depletion, hydrogen plasma, VUV radiation, surface modification, hydrophilic
Objavljeno v DiRROS: 10.11.2025; Ogledov: 509; Prenosov: 294
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