Abstract Balloon-borne Instrument for Spectral Scanning of high-altitude Environments (BISSE) is a lightweight gamma-ray measurement setup that can be placed in standard weather balloons and retrieved after the flight. This allows multiple flights with relatively small cost. The purpose BISSE to record spectral information on radiation at high altitudes. To obtain good resolution weight we use cadmium zinc telluride (CZT) detector which has crystal dimension 1 cm cubed. commercially...

Variations of the cosmogenic radionuclide 7 Be in global atmosphere are driven by cooperation processes its production, air transports, and removal. We use a combination Goddard Institute for Space Studies ModelE OuluCRAC:7Be production model to simulate variations concentration period from 1 January 28 February 2005. This features significant synoptic variability at multiple monitoring stations around globe spans an extreme solar energetic particle (SEP) event that occurred on 20 January....

The sediments deposited in Lake Kevojärvi (69°45N, 27°00′E) northernmost Finland were investigated for radioactivity. Freeze cores recovered from the 35-m deep basin has preserved a distinct succession of annual laminations between 1909 and 2015. basic varve structure is composed detrital snowmelt layer an organic-rich post-snowmelt lying on top layer. past nuclear events have been lake sediment. In order to study these, sediment freeze with bottom measured gamma emitting radionuclides. A...

The history of expansion bloom-forming cold water dinoflagellates in the Northern Baltic Sea was studied using 100-year-old sediment archives their resting cysts. Vertical cyst distributions Biecheleria baltica and Apocalathium malmogiense, two indistinguishable by light microscopy not recognized as distinct species monitoring, chain-forming Peridiniella catenata were analysed Pb210 Cs137 dated layers a core from deep, hypoxic accumulation bottoms Gulf Finland. Cyst profiles showed that B....

Measurements of the natural radiation background with different devices and at various conditions are important from a methodological point view in order to compare eventually inter-calibrate experimental sets, also provide reliable basis for improving existing models assessment environmental Earth's atmosphere. Here, we report results measurements small portable device, namely mobile dosimetry unit (MDU)-1 Liulin, performed Arctic region, including altitude profile atmospheric obtained...

Abstract. The short-living cosmogenic isotope 7Be, which is produced by cosmic rays in the atmosphere, often used as a tracer for atmospheric dynamics, with precise and high-resolution measurements covering recent decades. long-living 10Be, measured polar ice cores an annual resolution, proxy long-term cosmic-ray variability, whose signal can, however, be distorted transport deposition that need to properly modeled accounted for. While of 7Be can high accuracy using known meteorological...

Monitoring of 137Cs in reindeer herders and meat Finnish Lapland began the early 1960s has continued until today. The monitoring Halla area after Chernobyl accident. In this study, together with samples were monitored for gamma-emitting radionuclides from two separate areas management area, Northern Finland area. effective half-lives determined 3.0 ± 1.7 to 5.1 0.5 y. For 134Cs, observed 1.3 0.2 1.5 0.1 among male female 5.5 4.4 0.9 y, respectively, body-burden 137Cs. herding cooperative,...

Abstract. Short-living cosmogenic isotope 7Be, produced by cosmic rays in the atmosphere, is often used as a probe for atmospheric dynamics. Previously, modelling of beryllium transport was performed using simplified box-models or air back-tracing codes. While ability full dynamics models to model demonstrated earlier, no such ready-to-use currently available. Here we present chemistry-climate SOCOL-AERv2-BEv1 trace isotopes atmosphere. The SOCOL (SOlar Climate Ozone Links) has been improved...

Knowledge of past anthropogenic sources radionuclide contamination in Russian Arctic areas is important to assess the radioecological situation these less-studied regions. Therefore, we investigated 1990s. Lichen and moss samples were collected from 1993 1996 Kola Peninsula, Franz Josef Land, few other locations. The activity concentration 137Cs was determined archived by gamma spectrometry 2020. After radiochemical separation Pu U isotopes lichens mosses, mass ratios 240Pu/239Pu, 234U/238U,...

Radiation and Nuclear Safety Authority—STUK monitors the amount of airborne radioactivity with three aerosol samplers in Northern Finland. Naturally occurring radioactive nuclei 7Be 22Na can be seen. A time series was constructed for both observed at Rovaniemi (lat 66,3° N long 25,4° E). The most consistent found to from Ivalo 68,64° 27,57° were compared ratio plotted. analysis performed find periodicities. Two periodicities longer than one year 4,3 years 11 years, also 3 shorter 1,7 months,...

<title>Abstract</title> Terrestrial Gamma Glow (TGG) was detected for the first time in high latitudes outside latitudinal band of ± 38° where Flashes (TGF) are typically observed. This study reports observations a TGG events that occurred Southern Finland at municipality Vantaa (60° 18’ N 24° 58’ E 55 m a.m.s.l) on May 17th, 2020 between 10:15 and 10:30 UTC. Three independently measuring units NaI(Tl) γ spectrometers were used when thundercloud emitting radiation passed over or near...

The CREDO-Maze project is the concept for a network of stations recording local, extensive cosmic ray air showers. Each station consists four small scintillation detectors and control unit that monitors flux 24 h day transmits results to central server. modular design each array allows be used in educational classes on nuclear radiation, relativistic physics, particle physics as teaching aid regular school classrooms more. As an example, we present here some preliminary from muon telescope...

Abstract This study reports observations of Thunderstorm Ground Enhancements (TGE) that occurred in Southern Finland the Municipality Vantaa (60° 18’ N 24° 58’ E at 55 m a.m.s.l) on May 17th, 2020 between 10:23 and 10:28 UTC. The TGEs when a storm front moved across Helsinki region from roughly southwest to northeast direction. were caused by Runaway Relativistic Electron Avalanche (RREA) occurring inside thundercloud. Three independent measuring units high-volume NaI(Tl) γ spectrometers...