CEFAS7f9ffe62-1736-471a-b9c8-ecfe032a13ce English dataset Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk pointOfContact 2025-05-09T12:46:50 EPSG Geodetic Parameter Registry 2022-01-07 revision WGS 84 Radionuclides data within sediment cores collected in the North Sea between 2023 and 2024 and the Celtic Sea during 2023 2025-05-08 publication 2025-05-09 revision 2025-04-16 creation CEFAS22176 https://data.cefas.co.uk These sample data are from sediment cores collected using a NIOZ (Royal Netherlands Institute for Sea Research design) Box Corer during 3 surveys conducted by the Research Vessel (RV) Cefas Endeavour. Samples were analysed for and data presented for lead-210 ( 210Pb), polonium-210 (210Po), caesium-137 (137Cs), radium-226 (226Ra), radium-228 (228Ra), and potassium-40 (40K)and used to help validate the range of sediment accumulation rates observed in the top 30 cm of the core (e.g., 137Cs) and assess any potential mineralogical changes across the studied core segment (e.g., 40K). Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk originator Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk custodian Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk distributor Department for Environment, Food and Rural Affairs (DEFRA) defra.helpline@defra.gov.uk owner notPlanned Radionuclide Sediment Sea bed Ecosystem Analysis GEMET, version 1.0 2008-06-01 publication Habitats and biotopes GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Sediment SeaVoX Vertical Co-ordinate Coverages 2010-05-18 revision Marine Environmental Data and Information Network MEDIN metadata record availability 2012-01-11 publication data.gov.uk MEDIN metadata record availability 2012-01-11 publication otherRestrictions noLimitations otherRestrictions These data are currently pending release and may be made available on request to Cefas at present. Once published, the data will be licensed under the Open Government Licence v3.0 ( `https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/`_ ) – Please note the applicable attribution statement is as follows: ‘includes Crown copyright, Cefas 2025' .. _`https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/`: https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ English environment 1.73881 1.74086 52.4581 52.4595 2023-05-20 2024-06-09 Unknown https://data.cefas.co.uk/view/22176 Cefas Data Portal information The Cefas Data Portal contains metadata records and data sets available to download and connect to in support of our commitment to open science. dataset INSPIRE Data Specification on Habitats and Biotopes – Technical Guidelines 2013-12-10 publication false See the referenced specification Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 publication true See the referenced specification These data are from the following areas and surveys. - CEND072023 – North Sea (Farnes Deep, Fulmar, & Dogger Bank) – May 20- th- to June 10- th- , 2023. - CEND172023 – Celtic Sea – November 9- th- to November 28- th- , 2023. - CEND092024 – North Sea (Farnes Deep, Fulmar, & Dogger Bank) - May 24- th- to June 9- th- , 2024. At each station within a survey a NIOZ Box Corer was deployed collecting cores up to a maximum sediment depth of 30cm. A metal cylinder was used to take 10cm diameter sub core which were sliced at 2cm intervals for CEND072023 and CEND172023, and 1cm for CEND092024. Between 27 and 34 g of selected slices was mechanically compressed in a uniform plastic container that was then sealed and kept for at least for 21 days prior to high resolution gamma spectrometry analysis (ORTEC Broad Energy Germanium detector (BEGe), USA) to determine indirectly the activity concentration levels of radium-226 (226Ra) or supported lead-210 (210Pb), via its decay product lead-214 at 352 keV. Total 210Pb (i.e., sum of unsupported and supported fractions of 210Pb) was also determined indirectly via alpha spectrometry by measuring 210Po, a decay product of 210Pb in all slices. In more detail, approximately 0.3 g of freeze-dried material was spiked with a known amount of 209Po radiotracer (NPL, UK) and digested using 12 ml of a mixture of HNO3/HF (3/1) in a microwave system (CEM Mars 6, USA). After neutralisation using saturated H3BO3 and evaporation to dryness, each sample solution was taken up to 25 ml 0.5M HCl solution to allow for the spontaneous deposition of 209Po and 210Po on a silver disc for 5 hours at 90˚C. Each silver disc was finally counted via alpha spectrometry for up to 5 days (ORTEC Octête Plus, USA). A data point can potentially have multiple Quality Flags (QFlags) which will be semicolon separated. Definition of each QFlag can be found in the QFlag text file attached to this record. This dataset was produced by work supported jointly by the Joint Nature Conservation Committee (JNCC) lead NC40 Offshore Marine Monitoring project funded by Department of Environment, Food, & Rural Affairs (Defra) under its flagship marine Natural Capital and Ecosystem Assessment (mNCEA) programme and by the Defra funded Carbon Management Project (project number MRD333). Find out more about mNCEA at `https://www.gov.uk/government/publications/natural-capital-and-ecosystem-assessment-programme`_ . .. _`https://www.gov.uk/government/publications/natural-capital-and-ecosystem-assessment-programme`: https://www.gov.uk/government/publications/natural-capital-and-ecosystem-assessment-programme MEDIN 3.1.1