| 1. |
- Persson, Bertil R.R., et al.
(författare)
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Radioecological modelling of Polonium-210 and Caesium-137 in lichen-reindeer-man and top predators
- 2018
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Ingår i: Journal of Environmental Radioactivity. - : Elsevier BV. - 0265-931X .- 1879-1700. ; 186, s. 54-62
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Tidskriftsartikel (refereegranskat)abstract
- This work deals with analysis and modelling of the radionuclides 210Pb and210Po in the food-chain lichen-reindeer-man in addition to 210Po and 137Cs in top predators. By using the methods of Partial Least Square Regression (PLSR) the atmospheric deposition of 210Pb and 210Po is predicted at the sample locations. Dynamic modelling of the activity concentration with differential equations is fitted to the sample data. Reindeer lichen consumption, gastrointestinal absorption, organ distribution and elimination is derived from information in the literature. Dynamic modelling of transfer of 210Pb and 210Po to reindeer meat, liver and bone from lichen consumption, fitted well with data from Sweden and Finland from 1966 to 1971. The activity concentration of 210Pb in the skeleton in man is modelled by using the results of studying the kinetics of lead in skeleton and blood in lead-workers after end of occupational exposure. The result of modelling 210Pb and 210Po activity in skeleton matched well with concentrations of 210Pb and 210Po in teeth from reindeer-breeders and autopsy bone samples in Finland.The results of 210Po and 137Cs in different tissues of wolf, wolverine and lynx previously published, are analysed with multivariate data processing methods such as Principal Component Analysis PCA, and modelled with the method of Projection to Latent Structures, PLS, or Partial Least Square Regression PLSR.
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| 2. |
- Strömberg, Ulf, et al.
(författare)
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Cutaneous malignant melanoma show geographic and socioeconomic disparities in stage at diagnosis and excess mortality.
- 2016
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Ingår i: Acta oncologica (Stockholm, Sweden). - 1651-226X. ; 55:8, s. 993-1000
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Tidskriftsartikel (refereegranskat)abstract
- Background Preventive measures are needed to counteract the increasing burden of cutaneous malignant melanoma (CMM). As a basis for rational melanoma prevention, we investigated geographic differences and impact from socioeconomic factors related to incidence, clinical stage at diagnosis and outcome. Material and methods All patients with primary invasive CMM diagnosed in 2004-2013 in the southern and the western Swedish health care regions with a population of 2.9 million adults were eligible for the study. Population-based data were obtained from the national Cancer Register and the national Melanoma Quality Register. Geographic and socioeconomic differences in incidence per stage at diagnosis were mapped and correlated to excess mortality. Results Disease mapping based on 9743 cases in 99 municipalities and 20 metropolitan districts showed marked, regional disparities in stage-specific incidence of CMM. The incidence of stage I-II tumors was higher in the western health care region, whereas the incidence of stage III-IV CMMs was higher in the southern region. The divergent incidence patterns per stage at diagnosis were consistent across population strata based on educational level. The geographic disparities in CMM stage influenced relative survival with an excess five-year mortality ratio in the southern region versus the western region of 1.49 (95% confidence interval 1.22-1.82). The excess mortality ratio for patients with low versus high educational level was 1.81 (1.37-2.40). Conclusion Residential region and educational level influenced CMM stage and, thereby, excess mortality. These observations suggest that geographic as well as socioeconomic data should be considered in prevention of CMM.
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| 3. |
- Persson, Bertil R, et al.
(författare)
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(7)Be, (210)Pb, and (210)Po in the surface air from the Arctic to Antarctica.
- 2014
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Ingår i: Journal of environmental radioactivity. - : Elsevier BV. - 1879-1700 .- 0265-931X. ; 138, s. 364-74
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Tidskriftsartikel (refereegranskat)abstract
- In the present study we have investigated the activity concentrations of (210)Pb, (210)Po as well as (7)Be in surface air of the North and South Atlantic (1988-1989), the Arctic Ocean (1991), and along the coastline of Siberia (1994) during succeeding expeditions in the Swedish Polar Research program. During the cruises in the Arctic Ocean during 1991-07-28 to 1991-10-04 the average airconcentrations of (7)Be was 0.6±0.4mBq/m(3), (210)Pb 40±4μBq/m(3) and (210)Po-38±10μBq/m(3). During the Swedish-Russian Tundra Ecology-94 expedition along the Siberian coastline the average air concentrations of (7)Be and (210)Pb measured during May-July were 11±3, and 2.4±0.4mBq/m(3), and during July-September they were 7.2±2 and 2.7±1.1mBq/m(3) respectively. The results from measurements of the activity concentration of (210)Pb in the air over the Arctic Ocean vary between 75 and 176μBq/m(3). Inthe air close to land masses, however, the activity concentration of (210)Pb in the air increases to 269-2712μBq/m(3). The activity concentration of (7)Be in the South Atlantic during the cruise down to Antarctica varied between 1.3 and 1.7 with an average of 1.5±0.8mBq/m(3). The activity concentration of (210)Pb in the South Atlantic down to Antarctica varied between 6 and 14μBq/m(3). At the Equator the activity concentration recorded in November 1988 was 630μBq/m(3) and in April 1989 it was 260μBq/m(3). The average activity concentration of (210)Pb during the route Gothenburg-Montevideo in 1988 was 290 and on the return Montevideo-Gothenburg it was 230μBq/m(3). The activity concentration of (210)Po in the South Atlantic down to Antarctica varied between 15 and 58μBq/m(3). At the Equator the activity concentration in November 1988 was 170 and in April 1989 it was 70μBq/m(3). The average activity concentration of (210)Po during the route Gothenburg-Montevideo in 1988 was 63 and on the return Montevideo-Gothenburg it was 60μBq/m(3). The average of the activity concentrations in the Antarctic air of (210)Pb was 27±10μBq/m(3) and of (210)Po it was 12±7μBq/m(3). All our results were compiled together with other published data, and the global latitudinal distribution of (210)Pb was converted to total annual deposition (Bq/m(2)/a) and fitted to a 4th degree polynomial. By using the global latitudinal distribution of (210)Po/(210)Pb-activity ratio from our own results the global latitudinal distribution of (210)Po annual deposition was derived.
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