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Kotilainen, Aarno T; Kotilainen, Mia M; Vartti, Vesa-Pekka; Hutri, Kaisa-Leena; Virtasalo, Joonas J (2021): Maximum 137Caesium activity content data of subsurface sediments from the Gulf of Bothnia, northern Baltic Sea [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.938175

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Abstract:
This dataset includes maximum contents of 137Caesium in subsurface sediments determined for 1-cm sediment slices of 55 short gravity-cores from the Gulf of Bothnia, northern Baltic Sea. Sediment cores recovered consist primarily of soft, organic-rich, silty clay or clayey silt. Radioactivity from 137Cs in sediments has generally declined due to radioactive decay of 137Cs over the last decades. However, 137Cs contents in subsurface sediments remain at elevated levels compared to pre-Chernobyl levels (i.e. levels before the 1986 Chernobyl nuclear power plant accident). The 137Cs activity of untreated samples was measured by gamma spectrometry using an EG&E Ortec ACE™-2K spectrometer with a four-inch NaI/TI detector at the Geological Survey of Finland (GTK), Espoo. Since 2017, the 137Cs activity of sediment samples has been measured for 60 min using a BrightSpec bMCA-USB pulse height analyser coupled to a well-type NaI(Tl) detector at the Geological Survey of Finland. The 137Cs activity contents are presented per wet weight (Bq kg-1). Samples collected and measured over different years from 2001 to 2019 gave 137Cs values representing discrete time frames during the 18-year sampling/measuring interval, and are not fully, directly comparable. Thus, dataset lists also 137Cs activity content values decay corrected to 2021.
Keyword(s):
137Cs; Chernobyl; sediment; the Baltic Sea; the Gulf of Bothnia
Related to:
Kotilainen, Aarno T; Kotilainen, Mia M; Vartti, Vesa-Pekka; Hutri, Kaisa-Leena; Virtasalo, Joonas J (2021): Chernobyl still with us: 137Caesium activity contents in seabed sediments from the Gulf of Bothnia, northern Baltic Sea. Marine Pollution Bulletin, 172, 112924, https://doi.org/10.1016/j.marpolbul.2021.112924
Virtasalo, Joonas J; Österholm, Peter; Kotilainen, Aarno T; Åström, Mats E (2020): Enrichment of trace metals from acid sulfate soils in sediments of the Kvarken Archipelago, eastern Gulf of Bothnia, Baltic Sea. Biogeosciences, 17(23), 6097-6113, https://doi.org/10.5194/bg-17-6097-2020
Funding:
Academy of Finland, grant/award no. 292985: SmartSEA - Gulf of Bothnia as Resource for Sustainable Growth
European Regional Development Fund (ERDF), grant/award no. SEAmBOTH: SEAmless Maps and Management of the northern BOTHnian Bay
Executive Agency for Small and Medium-sized Enterprises (EASME), grant/award no. EASME/EMFF/2018/1.3.1.8 - Lot 1/SI2.811048: EMODnet Geology
Coverage:
Median Latitude: 64.173965 * Median Longitude: 22.617264 * South-bound Latitude: 61.068500 * West-bound Longitude: 19.730200 * North-bound Latitude: 65.744600 * East-bound Longitude: 24.458200
Date/Time Start: 2001-09-28T00:00:00 * Date/Time End: 2019-08-09T00:00:00
Minimum DEPTH, sediment/rock: 0.000 m * Maximum DEPTH, sediment/rock: 0.445 m
Event(s):
44-Ge-02  * Latitude: 64.035800 * Longitude: 22.871200 * Date/Time: 2002-07-23T00:00:00 * Elevation: -41.5 m * Location: Gulf of Bothnia * Method/Device: Gravity corer (GC) * Comment: Sampled with RVKaita
45-Ge-02  * Latitude: 63.873100 * Longitude: 23.008800 * Date/Time: 2002-07-24T00:00:00 * Elevation: -12.7 m * Location: Gulf of Bothnia * Method/Device: Gravity corer (GC) * Comment: Sampled with RVKaita
50-Ge-02  * Latitude: 63.240100 * Longitude: 22.040700 * Date/Time: 2002-07-27T00:00:00 * Elevation: -5.0 m * Location: Gulf of Bothnia * Method/Device: Gravity corer (GC) * Comment: Sampled with RVKaita
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Event labelEventKotilainen, Aarno T
2 IdentificationIDKotilainen, Aarno T
3 Sample IDSample IDKotilainen, Aarno T
4 DEPTH, sediment/rockDepth sedmKotilainen, Aarno TGeocode
5 LATITUDELatitudeKotilainen, Aarno TGeocode
6 LONGITUDELongitudeKotilainen, Aarno TGeocode
7 Depth, bathymetricBathy depthmKotilainen, Aarno T
8 DATE/TIMEDate/TimeKotilainen, Aarno TGeocode
9 VesselVesselKotilainen, Aarno TRV
10 Caesium-137137CsBq/kgKotilainen, Aarno TGamma spectrometry, NaI(Tl) detectorMax_137Cs
11 Caesium-137, decay corrected137Cs dec corrBq/kgKotilainen, Aarno TDecay correctionMax_137Cs: decay corrected to 2021
12 Reference/sourceReferenceKotilainen, Aarno T
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 3 (ProcLevel3)
Size:
385 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Event		2 
ID		3 
Sample ID		4 
Depth sed [m]		5 
Latitude		6 
Longitude		7 
Bathy depth [m]		8 
Date/Time		9 
Vessel		10 
137Cs [Bq/kg]		11 
137Cs dec corr [Bq/kg]		12 
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