| 1. |
- Persson, Bertil R, et al.
(författare)
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Radioactivity Exploration from the Arctic to the Antarctic. Part 1: Introduction
- 2015
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Ingår i: Radioactivity Exploration from the Arctic to the Antarctic.. - 1651-5013. ; 2015-002, s. 1-4
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Bokkapitel (refereegranskat)abstract
- This book is dedicated to professor emeritus Bengt Forkman (Nuclear Physics, Lund University) who in 1979 took the initiative to arrange an environmental radioactivity research program for the Ymer-80 expedition. He engaged his old friend Bertil Persson whom he during the 1960th inspired to university studies in Lund who just been promoted to professor of Radioecology at the Swedish University of Agricultural Sciences in Uppsala. Bertil Persson was tutor for Elis Holm at Lund University, who for his thesis was engaged in radiochemical analysis of plutonium isotopes in the environment. Elis Holm became deeply involved in management of Ymer-80 and all the following expeditions as well. We found a superior talent for the logistics in Kjell-Åke Carlsson (who was mechanical engineer at the department of radiation physics at Lund University). Without him, we would not have been able to solve all the thousands of practical issues and contacts with authorities and sponsors. He also contributed with the diaries extensive photographic and video documentation of all the expeditions. We have together compiled this book although several others were partly engaged in the various expeditions to whom we are deeply thankful for their contributions. They will appear as contributors in the separate parts of this book: 1. Ymer-80 (Bengt Forkman, Boel Forkman, Lars Ahlgren (diseased) 2. Swedarp 1988-1989 (Per Roos, Birgitta Roos) 3. Arctic Ocean 1991 4. Tundra Expedition 5. Arctic Ocean 1996 (Dan Josefsson, Mats Ericsson)
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| 2. |
- Persson, Bertil R
(författare)
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Global distribution of 7Be, 210Pb and, 210Po in the surface air (with Appendix A-E)
- 2016
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- In the effort of modelling the global distribution 7Be, 210Pb and 210Po in surface air, the results from exploration of radioactivity exploration from the Arctic to the Antarctic during 1980 to 1996 are compiled with the results reported by other authors. Partial least square regression modelling PLS-regression, predict missing 7Be, 210Pb and 210Po values of air concentration or annual deposition. All available data of air concentration and deposition, of these radionuclides are then correlated with geophysical parameters. The results indicate that the global latitudinal distribution of 7Be air concentration was rather flat, with an overall global average of 4.2 (SE 0.4) mBq.m-3, although with a slight dip at the equator and decrease towards high latitudes. The corresponding latitudinal distribution was also flat, and decreased slightly at high and low altitudes, with overall global average of 7Be annual deposition was 1500 (SE 100) Bq.m-3.a-1. The 7Be deposition rate estimated from reported annual mean air concentration and annual deposition is 13.4 +/- 1.7 (SE) mm.s-1. By using PLS-r modelling of either air concentrations or annual depositions, the average deposition rate of 7Be was estimated to 12.3 +/- 1.6 (SD) mm.s-1. The 7Be deposition-rate don´t vary significantly with longitude, latitude or geometrical average year of sampling date. Linear regression with height, however, is negative with a coefficient of - 0.02. At sea level, the 7Be deposition-rate was estimated to 13 mm.s-1, while at a height of 800 m it was predicted to be 7 mm.s-1. The 16 values of 7Be deposition rate, reported in the literature, are widely scattered (SD = 18) with an average of about 18 mm.s-1. The latitudinal distribution of the activity concentration of 210Pb in air showed a maximum of about 600 +/- 200 micoBq.m-3 around 45 oN with a steady decrease towards higher and lower latitudes. Minimum values of 400 micoBq.m-3 and 80 micoBq.m-3 were estimated at 90 oN and at 90 oS respectively. The latitudinal distribution of all 210Pb air concentration values (micoBq.m-3) is given by the following equation: log10[210Pb] = 2.52 + 0.0083·(Latitude) - 9.87.10-5· (Latitude)2. The latitudinal distribution of all 210Pb annual deposition values (Bq.m-2.a-1) showed a maximum of about 200 +/- 100 Bq.m-2.a-1 around 45 oN, with a steady decrease towards higher and lower latitudes. A minimum of 100 Bq.m-2.a-1 was predicted at 90 oN, although a value of 17 +/- 4 Bq.m-2.a-1 has been recorded at 84.4 oN 2.3 oW. At 90 oS the predicted 210Pb annual deposition was 3 Bq.m-2.a-1. The 210Pb deposition rate was estimated 12.5 +/- 0.7 mm.s-1 with no significant variation with latitude, height, or average of interval of sampling date. With longitude, however, the 210Pb deposition rate varied significantly (linear k=0.02) R=0.99. The values of 210Po air concentration around 20 - 45 oN ranged between 50 – 1000 micoBq.m-3 with a mean of 200 micoBq.m-3, and the 210Po annual deposition ranged between 20-800 Bq.m-2.a-1 with a mean of 100 Bq.m-2.a-1. The longitudinal distribution of the 210Po/210Pb activity ratios follow a narrow linear relation from 0.2 at 90 oW to 1.0 at 170 oE. While the 210Po air concentration and annual deposition are widely distributed along the longitudes with a slight decrease west of the Greenwich meridian.
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| 3. |
- Persson, Bertil R
(författare)
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Analysis and modelling radio-ecological concentration processes of the food chain lichen - reindeer – man. : In memory of my fellow Elis Holm Ph.D. professor
- 2020
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Ingår i: Acta Scientiarum Lundensia. - 1651-5013. ; 2020:002, s. 1-31
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- AbstraktVid den första internationella radioekologikonferensen 25-29 april 1966 i Stockholm presenterade jag min studie om överföringen av 55Fe i livsmedelskedjan lav-ren. Det här dokumentet presenterades den 6–9 november 2016 i Sevilla (Spanien) för den 2: a INTERNATIONELLA KONFERENSEN OM RADIOEKOLOGISKA KONCENTRATIONPROCESSER (50 år senare) som organiserades av prof. Elis Holm, Göteborgs universitet (Sverige) och prof. Rafael Garcia-Tenorio, Universitetet i Sevilla (Spanien).Analys och modellering av den naturliga radioaktiva 210Pb och 210Po i samma livsmedelskedja utfördes med användning av metoderna för partiell minsta kvadratregression (PLS-r) information om den atmosfäriska avsättningen av 210Pb och 210Po härleds från lokala utfällningsdata. Resultatet av modellering av aktivitetskoncentrationen i lav jämförs med experimentella provdata som samlats in under 1966-1971.Information om konsumtion av renlig lav, gastrointestinal absorption och organfördelning härrör från information i litteraturen. Resultaten av modellering av överföringen av 210Pb och 210Po till renkött, lever och ben från lavkonsumtion jämförs med mätningar av prover som samlats in i Sverige och Finland under 1966-1971.Slutligen jämförs resultaten av modellering 210Pb och 210Po aktivitetskoncentration i olika människors organ med prover som samlats in från renuppfödare i Sverige och Finland under 1966-1971. Aktivitetskoncentrationen på 210Pb i skelettet modelleras med hjälp av resultaten från att studera kinetiken för bly i skelett och blod hos blyarbetare efter att yrkesexponeringen avslutats. Resultatet av modellering av 210Pb och 210Po-aktivitet i skelett jämförs med prover av tänder från renuppfödare och obduktionsbenprover i Finland
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| 4. |
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| 5. |
- Persson, Bertil, et al.
(författare)
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The redox state of glutathione, cysteine and homocysteine in the extracellular fluid in the skin.
- 2002
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Ingår i: Free Radical Research. - : Informa UK Limited. - 1029-2470 .- 1071-5762. ; 36:2, s. 151-156
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Tidskriftsartikel (refereegranskat)abstract
- Glutathione, the most abundant low-molecular weight thiol in the skin, has been shown to protect the skin from both photobiological and chemical injury. The thiols, glutathione in particular, have also been shown to be crucially involved in defence against contact allergens. Since the levels of extracellular thiol concentrations are important determinants of intracellular thiol status, we have compared the normal concentrations and the redox status of the main low-molecular weight thiol components in the extracellular fluid at the dermo-epidermal junction with the corresponding plasma levels. In their sulfhydryl form, all three thiols, i.e. glutathione, cysteine and homocysteine, were more abundant in experimental skin blister fluid than in plasma, as were the free disulfides of glutathione and homocysteine, whereas the free disulfides of cysteine were about the same in blister fluid and in plasma. Protein mixed disulfide levels were higher in plasma than in blister fluid. The present results provide information concerning the extracellular defence in the skin.
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| 6. |
- Persson, Bertil R, et al.
(författare)
-
Radioactivity Exploration : From the Arctic to the Antarctic
- 2017
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Bok (refereegranskat)abstract
- This book is dedicated to professor emeritus Bengt Forkman (Nuclear Physics, Lund University) who in 1979 took the initiative to arrange an environmental radioactivity research program for the Ymer-80 expedition. He engaged his old friend Bertil Persson whom he during the 1960th inspired to university studies in Lund and who 1980 has been promoted to professor of Radioecology at the Swedish University of Agricultural Sciences in Uppsala, Sweden. Bertil Persson was tutor for Elis Holm at Lund University, who for his thesis was engaged in radiochemical analysis of plutonium isotopes in the environment. Elis Holm became deeply involved in Ymer-80 and management of all the following expeditions as well. We found a superior talent for the logistics in Kjell-Åke Carlsson (who was mechanical engineer at the department of radiation physics at Lund University). Without him, we would not have been able to solve all the thousands of practical issues and contacts with authorities and sponsors. He also contributed with the diaries extensive photographic and video documentation of all the expeditions. Unfortunately he died in October 2016 just as we finished the first draft of the manuscript to this book, that here is published to his memory.
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| 7. |
- 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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| 8. |
- Persson, Bertil R, et al.
(författare)
-
II INTERNATIONAL CONFERENCE ONRADIOECOLOGICAL CONCENTRATION PROCESSES : II INTERNATIONAL CONFERENCE 50 years later
- 2016
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Bok (refereegranskat)abstract
- From the 6th to the 9th of November 2016, in the meeting hall of Centro Nacional de Aceleradores(University of Seville, Seville, Spain) took place the “II International Conference onRadioecological Concentration Processes (50 years later)” under the joint organization of theUniversities of Seville (Spain) and Gothenburg (Sweden). With this event, the organization try tocommemorate the fifty years anniversary of the first Radioecological Concentration ProcessesConference hold in Stockholm, which is recognized as an extremely important event whichcontributed to the birth of the modern radioecology: In the pioneer 1966 conference, more than 100communications were presented and a good number of participants played afterwards an essentialrole in the development and growing of the radioecology as scientific discipline.The first conference had as a main motivation the dissemination of the radioecological studiesappearing at that time associated to the nuclear weapon tests performed by USA and the formerUSSR at the end of the 1950s or beginning of the 1960s. Since then, a lot of anthropogenicemissions of radioactivity (provoked or accidental) have occurred, being remarkable at the dates ofthis II edition the 30 years passed since the Chernobyl accident and the 5 years passed from theFukushima accident. In addition, the emergence of new analytical techniques has made possible toextend the radioecological studies to new radionuclides and environmental compartments.With this II edition of the Conference, the promotors have tried to obtain information about theactual status of the radioecology over the world, to evaluate the advances reached during the lastyears and to plan the development of some priority research lines to be followed along the first halfof the XXI century. Just thinking in the future of the radioecology, special efforts were devoted tostimulate the active participation, through presentation of communications, of young researchers.
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| 9. |
- Persson, Bertil R
(författare)
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QF Modelling of Electro-Pulse-Therapy
- 2019
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Ingår i: Acta Scientiarum Lundensia. - 1651-5013. ; 2019:001, s. 1-17
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Tidskriftsartikel (refereegranskat)abstract
- In electro-pulse therapy treatment, only the cells exposed to a sufficiently strong electric field will respond immediately. The tumour cells that are permeabilized become much more accessible to hydrophilic molecules since these are normally rejected by the membrane barrier. The anticancer agent Bleomycin has proven to be the most potent drug in electro-pulse therapy and is the one often used in electro-pulse chemotherapy. However, cisplatin, another anticancer agent has also been found to be effective in electro-pulse chemotherapy. Usually, needle electrodes are used for clinical treatment of tumours with Electro-pulse Chemotherapy. A short 100 microsecond pulse with a field-strength of about 1000 V/cm is applied between a pair of electrodes inserted in the tissue to be treated. After the initial pulse, the conductivity in the tissue close to the needle electrodes increase extensively. The aim is to investigate this effect of the initial pulse on the distribution of potential, electric field, current density and absorbed power density of the following pulses. The present investigation has been possible to perform by using the evaluation grant of QuickField Professional program kindly submitted by the QuickField Support Team.According to the result of the present QF simulation, the average pulse strength in the centre between the electrodes will increase above the recommended 1000 V/cm after the initial pulse, causing a high degree of non-reversible electroporation in the target volume by following pulses of the same amplitude.
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| 10. |
- Persson, Bertil R, et al.
(författare)
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Så började klinisk NMR i Lund
- 2017
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Ingår i: Acta Scientiarum Lundensia. - 1651-5013. ; 2017:001, s. 1-15
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Innehållsförteckning:I. Konferens i MünchenII. Resan till England och SkottlandIII. Forskningsverksamheten startar i LundIV. Workshopen i HörbyV. NMR bokenVI. NMR apparatenVII. Diagnostisk radiologi
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