Soil technogenic radioactivity in the vicinity of the Morzhovets Lighthouse (the Morzhovets Island, Archangelsk region)

The aim of the study was to assess soil technogenic radioactivity in vicinity Morzhovets Lighthouse and surrounding areas by measuring radio caesium (137Cs) specific activity. Location time study. Field work performed area around (the Island, Archangelsk region) summer 2022. Methods. Soil samples were collected at 26 sites from 0-5 cm layer, which 12 also 5-10 и 10-20 layers. Aboveground phytomass sampled as well. In laboratory air-dried placed Marinelli vessel for 137Cs activity gamma-spectrometry. Registration gamma-radiation measured sample, well processing obtained spectra using Progress-gamma software hardware complex FVKM.412131.002-03. energy calibration gamma spectrometer control safety setup parameters carried out after each measurement a combined source OISN-137-1 vessel. minimal exposure sample 3600 sec; however, increased some with low Results. territory Island is occupied lowland seaside terraced plane landscapes tundra vegetation on peaty podsolised illuvial humus soils, alternating mires. Caesium top represented poorly decomposed peat horizon, found vary 9.4 144.5 Bq/kg illuvial-humus podzol (Gleyic Histic Entic Podzol) 12.2 139.4 bog gley soils (Fibric Histosols (Gleyic)). shown decrease sharply depth, reaching 3 detection limit gamma-spectrometer. Comparative analysis data showed that West Arctic sector decreases east west, increasing distance Novaya Zemlya, 80.2 Zemlya Archipelago) 80.7 (Bolshezemelskaya Tundra) 19. 2 Svalbard Island). Conclusions. distribution persistent fixation element upper 5 cm-thick organic part profile, representing primary biogeochemical barrier. does not accumulate radioactivity. Overall, Morzhovsky displays medley pattern. maximal values both soils.