ArticleRadiation protection dosimetry2025
Revisiting external dose rate and ground deposition of Chornobyl fallout in the Gävle region in Sweden: comparison between estimates from soil sampling vs in situ measurements using a field portable NaI(Tl) gamma spectrometer.
Article in Radiation protection dosimetry, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
A field survey was conducted in Sweden with the purpose to revisit the ground deposition of Chornobyl 137Cs and the associated ambient dose equivalent rate, H* (10), at various measuring locations in the Gävle and Älvkarleby municipalities. The specific purpose was to compare the 137Cs deposition values as measured in situ using a field portable gamma spectrometer [3″(Ø) × 3″ NaI(Tl)-crystal] with the ex situ estimates obtained from gamma spectrometry of soil cores taken at the measuring locations. An additional purpose was to re-assess the effective ecological half-times of the Cs-contribution to the H* (10) and compare with a previous assessment done for data until 2013. The results show that ex-situ soil sample data exceed the 137Cs deposition values from the field portable NaI(Tl) gamma spectrometer by, on average, 50%. The discrepancy could mainly attributed to the difference between the actual field-of-view seen by the portable device at 1 m above ground compared with the calibration geometry of an infinite planar surface with a Cs ground penetration at 3 g cm-2. The H* (10) measurements collected in 2022 could indicate that the effective ecological half-time of 137Cs attributed ambient dose equivalent rate in the area ranges between 10 and 20 y instead of the 6.8 y obtained from the previous assessment of data between 1987 and 2013. The findings demonstrate, however, the usability of the portable field gamma spectrometer when used to characterize the long-term time dynamics of external doses from 137Cs in cases where the 137Cs dose contribution is well below normal background levels.
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