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Ahonen, Mikko, PhD, post-doc researcher
Publications (10 of 13) Show all publications
Koppel, T., Vilcane, I. & Ahonen, M. (2018). 50 Hz magnetic field affects heart rate variability - An experimental study. In: EMF-Med 2018 - 1st EMF-Med World Conference on Biomedical Applications of Electromagnetic Fields and COST EMF-MED Final Event with 6th MCM: . Paper presented at 1st EMF-Med World Conference on Biomedical Applications of Electromagnetic Fields, EMF-Med 2018, Split, Croatia, 10 September 2018 through 13 September 2018. IEEE, Article ID 8526072.
Open this publication in new window or tab >>50 Hz magnetic field affects heart rate variability - An experimental study
2018 (English)In: EMF-Med 2018 - 1st EMF-Med World Conference on Biomedical Applications of Electromagnetic Fields and COST EMF-MED Final Event with 6th MCM, IEEE, 2018, article id 8526072Conference paper, Published paper (Refereed)
Abstract [en]

This study exposed subjects (N=108) to 50 Hz sinusoidal magnetic field at 4 μT. The test was done under blind test conditions, consisting of five stages, including control and exposure stages, each lasting for two minutes. The exposure took place in two stages. The results show, the average heart rate increased due course of the test (p=0.003). In addition, the total power of the heart rate variability (HRV) was statistically significantly lower during exposure stages than control stages. High frequency component of HRV decreases due course of the entire test (p = 0.014). 

Place, publisher, year, edition, pages
IEEE, 2018
Keywords
50 Hz, Heart rate variability, Magnetic field, Power frequency, Therapy
National Category
Engineering and Technology
Identifiers
urn:nbn:se:miun:diva-35243 (URN)10.23919/EMF-MED.2018.8526072 (DOI)2-s2.0-85057753172 (Scopus ID)978-9-5329-0079-8 (ISBN)
Conference
1st EMF-Med World Conference on Biomedical Applications of Electromagnetic Fields, EMF-Med 2018, Split, Croatia, 10 September 2018 through 13 September 2018
Available from: 2018-12-17 Created: 2018-12-17 Last updated: 2018-12-17Bibliographically approved
Carlberg, M., Koppel, T., Ahonen, M. & Hardell, L. (2018). Case-Control Study on Occupational Exposure to Extremely Low-Frequency Electromagnetic Fields and the Association with Meningioma. BioMed Research International, Article ID 5912394.
Open this publication in new window or tab >>Case-Control Study on Occupational Exposure to Extremely Low-Frequency Electromagnetic Fields and the Association with Meningioma
2018 (English)In: BioMed Research International, ISSN 2314-6133, E-ISSN 2314-6141, article id 5912394Article in journal (Refereed) Published
Abstract [en]

Objective. Exposure to extremely low-frequency electromagnetic fields (ELF-EMF) was in 2002 classified as a possible human carcinogen, Group 2B, by the International Agency for Research on Cancer at WHO based on an increased risk for childhood leukemia. In case-control studies on brain tumors during 1997-2003 and 2007-2009 we assessed lifetime occupations in addition to exposure to different agents. The INTEROCC ELF-EMF Job-ExposureMatrix was used for associating occupations with ELF-EMF exposure (mu T) with meningioma. Cumulative exposure (mu T-years), average exposure (mu T), and maximum exposed job (mu T) were calculated. Results. No increased risk for meningioma was found in any category. For cumulative exposure in the highest exposure category 8.52+ mu T years odds ratio (OR) = 0.9, 95% confidence interval (CI) = 0.7-1.2, and.. linear trend = 0.45 were calculated. No statistically significant risks were found in different time windows. Conclusion. In conclusion occupational ELF-EMF was not associated with an increased risk for meningioma.

National Category
Health Sciences
Identifiers
urn:nbn:se:miun:diva-32742 (URN)10.1155/2018/5912394 (DOI)000419164300001 ()2-s2.0-85040688542 (Scopus ID)
Available from: 2018-01-25 Created: 2018-01-25 Last updated: 2019-08-06Bibliographically approved
Carlberg, M., Koppel, T., Ahonen, M. & Hardell, L. (2017). Case-control study on occupational exposure to extremely low-frequency electromagnetic fields and glioma risk. American Journal of Industrial Medicine, 60(5), 494-503
Open this publication in new window or tab >>Case-control study on occupational exposure to extremely low-frequency electromagnetic fields and glioma risk
2017 (English)In: American Journal of Industrial Medicine, ISSN 0271-3586, E-ISSN 1097-0274, Vol. 60, no 5, p. 494-503Article in journal (Refereed) Published
Abstract [en]

Background

Exposure to extremely low-frequency electromagnetic fields (ELF-EMF) was in 2002 classified as a possible human carcinogen, Group 2B, by the International Agency for Research on Cancer at WHO.

Methods

Life time occupations were assessed in case-control studies during 1997-2003 and 2007-2009. An ELF-EMF Job-Exposure Matrix was used for associating occupations with ELF exposure (T). Cumulative exposure (T-years), average exposure (T), and maximum exposed job (T) were calculated.

Results

Cumulative exposure gave for astrocytoma grade IV (glioblastoma multiforme) in the time window 1-14 years odds ratio (OR)=1.9, 95% confidence interval (CI)=1.4-2.6, p linear trend <0.001, and in the time window 15+ years OR=0.9, 95%CI=0.6-1.3, p linear trend=0.44 in the highest exposure categories 2.75+ and 6.59+ T years, respectively.

Conclusion

An increased risk in late stage (promotion/progression) of astrocytoma grade IV for occupational ELF-EMF exposure was found.

Keywords
astrocytoma, electromagnetic fields, ELF-EMF, glioma, occupational exposure, RF-EMF, risk factors, wireless phones
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:miun:diva-30778 (URN)10.1002/ajim.22707 (DOI)000399609000010 ()28394434 (PubMedID)2-s2.0-85017463500 (Scopus ID)
Available from: 2017-05-23 Created: 2017-05-23 Last updated: 2017-06-21Bibliographically approved
Ahonen, M. (2017). Designing to archive open data – Case: ISERV e-services project.. In: : . Paper presented at The 40th Information Systems Research Seminar in Scandinavia (IRIS40) in Halden, Norway, August 6th-9th, 2017.
Open this publication in new window or tab >>Designing to archive open data – Case: ISERV e-services project.
2017 (English)Conference paper, Published paper (Refereed)
National Category
Information Systems
Identifiers
urn:nbn:se:miun:diva-32608 (URN)
Conference
The 40th Information Systems Research Seminar in Scandinavia (IRIS40) in Halden, Norway, August 6th-9th, 2017
Available from: 2017-12-22 Created: 2017-12-22 Last updated: 2018-01-13Bibliographically approved
Carlberg, M., Hedendahl, L., Ahonen, M., Koppel, T. & Hardell, L. (2016). Increasing incidence of thyroid cancer in the Nordic countries with main focus on Swedish data. BMC Cancer, 16, Article ID 426.
Open this publication in new window or tab >>Increasing incidence of thyroid cancer in the Nordic countries with main focus on Swedish data
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2016 (English)In: BMC Cancer, ISSN 1471-2407, E-ISSN 1471-2407, Vol. 16, article id 426Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Radiofrequency radiation in the frequency range 30 kHz-300 GHz was evaluated to be Group 2B, i.e. 'possibly' carcinogenic to humans, by the International Agency for Research on Cancer (IARC) at WHO in May 2011. Among the evaluated devices were mobile and cordless phones, since they emit radiofrequency electromagnetic fields (RF-EMF). In addition to the brain, another organ, the thyroid gland, also receives high exposure. The incidence of thyroid cancer is increasing in many countries, especially the papillary type that is the most radiosensitive type.

METHODS: We used the Swedish Cancer Register to study the incidence of thyroid cancer during 1970-2013 using joinpoint regression analysis.

RESULTS: In women, the incidence increased statistically significantly during the whole study period; average annual percentage change (AAPC) +1.19 % (95 % confidence interval (CI) +0.56, +1.83 %). Two joinpoints were detected, 1979 and 2001, with a high increase of the incidence during the last period 2001-2013 with an annual percentage change (APC) of +5.34 % (95 % CI +3.93, +6.77 %). AAPC for all men during 1970-2013 was +0.77 % (95 % CI -0.03, +1.58 %). One joinpoint was detected in 2005 with a statistically significant increase in incidence during 2005-2013; APC +7.56 % (95 % CI +3.34, +11.96 %). Based on NORDCAN data, there was a statistically significant increase in the incidence of thyroid cancer in the Nordic countries during the same time period. In both women and men a joinpoint was detected in 2006. The incidence increased during 2006-2013 in women; APC +6.16 % (95 % CI +3.94, +8.42 %) and in men; APC +6.84 % (95 % CI +3.69, +10.08 %), thus showing similar results as the Swedish Cancer Register. Analyses based on data from the Cancer Register showed that the increasing trend in Sweden was mainly caused by thyroid cancer of the papillary type.

CONCLUSIONS: We postulate that the whole increase cannot be attributed to better diagnostic procedures. Increasing exposure to ionizing radiation, e.g. medical computed tomography (CT) scans, and to RF-EMF (non-ionizing radiation) should be further studied. The design of our study does not permit conclusions regarding causality.

Keywords
Male, Adolescent, Adult, Female, Middle Aged, Young Adult, Aged, 80 and over, Incidence, Aged, Registries, Infant, Child, Preschool, Sweden, Humans, child, regression analysis, Cordless phone, Ionizing radiation, Mobile phone, NORDCAN, Nordic countries, Radiofrequency electromagnetic fields, RF-EMF, Surveys and Questionnaires, Swedish Cancer Register, Thyroid cancer, Thyroid Neoplasms
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Identifiers
urn:nbn:se:miun:diva-32592 (URN)10.1186/s12885-016-2429-4 (DOI)
Available from: 2017-12-22 Created: 2017-12-22 Last updated: 2018-01-04Bibliographically approved
Hardell, L., Koppel, T., Carlberg, M., Ahonen, M. & Hedendahl, L. (2016). Radiofrequency radiation at Stockholm Central Railway Station in Sweden and some medical aspects on public exposure to RF fields. International Journal of Oncology, 49(4), 1315-1324
Open this publication in new window or tab >>Radiofrequency radiation at Stockholm Central Railway Station in Sweden and some medical aspects on public exposure to RF fields
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2016 (English)In: International Journal of Oncology, ISSN 1019-6439, Vol. 49, no 4, p. 1315-1324Article in journal (Refereed) Published
Abstract [en]

The Stockholm Central Railway Station in Sweden was investigated for public radiofrequency (RF) radiation exposure. The exposimeter EME Spy 200 was used to collect the RF exposure data across the railway station. The exposimeter covers 20 different radiofrequency bands from 88 to 5,850 MHz. In total 1,669 data points were recorded. The median value for total exposure was 921 µW/m2 (or 0.092 µW/cm2; 1 µW/m2=0.0001 µW/cm2) with some outliers over 95,544 µW/m2 (6 V/m, upper detection limit). The mean total RF radiation level varied between 2,817 to 4,891 µW/m2 for each walking round. High mean measurements were obtained for GSM + UMTS 900 downlink varying between 1,165 and 2,075 µW/m2. High levels were also obtained for UMTS 2100 downlink; 442 to 1,632 µW/m2. Also LTE 800 downlink, GSM 1800 downlink, and LTE 2600 downlink were in the higher range of measurements. Hot spots were identified, for example close to a wall mounted base station yielding over 95,544 µW/m2 and thus exceeding the exposimeter's detection limit. Almost all of the total measured levels were above the precautionary target level of 3-6 µW/m2 as proposed by the BioInitiative Working Group in 2012. That target level was one-tenth of the scientific benchmark providing a safety margin either for children, or chronic exposure conditions. We compare the levels of RF radiation exposures identified in the present study to published scientific results reporting adverse biological effects and health harm at levels equivalent to, or below those measured in this Stockholm Central Railway Station project. It should be noted that these RF radiation levels give transient exposure, since people are generally passing through the areas tested, except for subsets of people who are there for hours each day of work.

Keywords
RF-EMF, radiation, exposure, microwave, dosimetry, public health, prevention
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Identifiers
urn:nbn:se:miun:diva-32591 (URN)10.3892/ijo.2016.3657 (DOI)
Available from: 2017-12-22 Created: 2017-12-22 Last updated: 2018-01-05Bibliographically approved
Ahonen, M. & Koppel, T. (2016). Voltage transients measurements and power line communication. In: 2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON): . Paper presented at 2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON) (pp. 1-4). IEEE
Open this publication in new window or tab >>Voltage transients measurements and power line communication
2016 (English)In: 2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON), IEEE, 2016, p. 1-4Conference paper, Published paper (Refereed)
Abstract [en]

Power line communication (PLC) connects energy producers with energy consumers. In the European Union stricter guidelines are under development to limit disturbances in the 2-150 kHz frequency range, because devices utilising PLC do not work. This study measured voltage transients in 22 locations and identified sources for noise. Home environments and public buildings were measured. Measurements were conducted in the frequency range of 150 kHz-500 kHz (according to EN 55011 to EN 55022) and in the lower frequency range of 3 kHz to 95 kHz. Results indicate that voltage transients are generated mostly by switching mode power supplies, pumps, rectifiers, inverters and even low quality smart meters. Several of these devices exceeded PLC standard level, 122 dBμV. Additionally we demonstrate that basic power quality recordings do not provide enough information to mitigate PLC problems occurring within microseconds and frequency specific voltage transient measurements are needed.

Place, publisher, year, edition, pages
IEEE, 2016
Keywords
Measurement, carrier transmission on power lines, Power line communications, power line communication, smart grid, Frequency measurement, Voltage measurement, Inverters, voltage transient, European Union, Power measurement, EN 55011, EN 55022, energy consumers, energy producers, frequency 150 kHz to 500 kHz, frequency 2 kHz to 150 kHz, frequency 3 kHz to 95 kHz, home environments, power system measurement, power system transients, powerline communication, public buildings, pumps, rectifiers, smart meters, switching mode power supplies, Transient analysis, voltage transients measurements, Smart Meter, Standards
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Environmental Engineering
Identifiers
urn:nbn:se:miun:diva-32590 (URN)10.1109/RTUCON.2016.7763143 (DOI)978-1-5090-3731-5 (ISBN)
Conference
2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)
Available from: 2017-12-22 Created: 2017-12-22 Last updated: 2018-01-05Bibliographically approved
Koppel, T. & Ahonen, M. (2015). Exposure to radiofrequency electromagnetic fields from mobile networking in motor-cars. Paper presented at 8th International Workshop on Biological effects of Electromagnetic Fields, Varna, Bulgaria, 21-26 September 2014. Bulgarian Journal of Public Health, 7(2 Suppl. 1), 24-30
Open this publication in new window or tab >>Exposure to radiofrequency electromagnetic fields from mobile networking in motor-cars
2015 (English)In: Bulgarian Journal of Public Health, ISSN 1313-860X, Vol. 7, no 2 Suppl. 1, p. 24-30Article in journal (Refereed) Published
Abstract [en]

The relevance of the study is prescribed by the rapid development in mobile computer and wireless data transmission technologies. The levels of radiofrequency electromagnetic fields that the population is exposed to have increased likewise. This article investigates the levels of exposure to the radiofrequency electromagnetic fields from mobile networking in motor-cars. The object of the study is...

Keywords
RF, exposure, car, vehicle, radiofrequency, radiation, microwave
National Category
Environmental Engineering
Identifiers
urn:nbn:se:miun:diva-32593 (URN)
Conference
8th International Workshop on Biological effects of Electromagnetic Fields, Varna, Bulgaria, 21-26 September 2014
Available from: 2017-12-22 Created: 2017-12-22 Last updated: 2018-01-08Bibliographically approved
Koppel, T., Ahonen, M. & Vilcāne, I. (2014). Reducing Exposure to Radiofrequency Electromagnetic Fields from Wireless Networking with Laptop Computers. In: 55th International Riga Technical University Conference SCEE’2014 “Scientific Conference on Economics and Entrepreneurship”, Latvia, Rīga, 14-17 October, 2014: . Paper presented at 55th International Riga Technical University Conference SCEE’2014 “Scientific Conference on Economics and Entrepreneurship”, Latvia, Rīga, 14-17 October, 2014 (pp. 1-2). Riga: RTU Press
Open this publication in new window or tab >>Reducing Exposure to Radiofrequency Electromagnetic Fields from Wireless Networking with Laptop Computers
2014 (English)In: 55th International Riga Technical University Conference SCEE’2014 “Scientific Conference on Economics and Entrepreneurship”, Latvia, Rīga, 14-17 October, 2014, Riga: RTU Press , 2014, p. 1-2Conference paper, Published paper (Refereed)
Abstract [en]

Mobile modems are used with laptops to connect Internet wirelessly. Recently several organisations, including the WHO IARC and the European Union have emphasised health risk-management practices related to wireless devices. We present here radio frequency (RF) power density measurements when a wireless modem is 30 cm, 1 m and 5 m from a user. Our results indicate that by using a USB cable and adding distance between a user and a wireless modem, there is a substantial reduction of exposure. Additionally we noticed a great difference in GSM/EDGE versus 3G/HSDPA radiation power density levels. Therefore, precautionary principle and USB-cable related risk-management practise is recommended when utilising wireless modems with laptops.

Place, publisher, year, edition, pages
Riga: RTU Press, 2014
Keywords
mobile modem, radiofrequency, radiation, laptop, exposure
National Category
Other Environmental Engineering
Identifiers
urn:nbn:se:miun:diva-32588 (URN)978-9934-8275-2-5 (ISBN)
Conference
55th International Riga Technical University Conference SCEE’2014 “Scientific Conference on Economics and Entrepreneurship”, Latvia, Rīga, 14-17 October, 2014
Available from: 2017-12-22 Created: 2017-12-22 Last updated: 2018-01-08Bibliographically approved
Koppel, T. & Ahonen, M. (2014). The Shielding of Inbound Radiofrequency Electromagnetic Fields at Workplaces. Safety of Technogenic Environment, 5, 29-37
Open this publication in new window or tab >>The Shielding of Inbound Radiofrequency Electromagnetic Fields at Workplaces
2014 (English)In: Safety of Technogenic Environment, E-ISSN 2451-313X, Vol. 5, p. 29-37Article in journal (Refereed) Published
Abstract [en]

The emergence of new technologies and increased use of wireless voice and data transmissions has increased the human exposure to the radiofrequency (RF) electromagnetic fields (EMFs). Effective reduction measures of these fields have become more relevant in risk management at workplaces. Not only occupational health, but also counter-espionage and low electromagnetic interference are important arguments for RF EMF mitigation. This study investigates the most commonly used mitigation materials and methods of RF EMFs. The materials investigated in this study included: a graphite based paint; a wire netting; a foil paper; a metalized fabric; a transparent conductive film and other solutions. The study undertook two kinds of measurements: 1) a semi-controlled environment was created to test the mitigation materials/methods under equal conditions, 2) measurements were conducted before and after the implementation of the intervention measures in the actual living and working environments. The results revealed great differences in various mitigation materials and methods: under semicontrolled conditions the best shielding capability was achieved by metallized fabric, followed by iron wire netting and foil paper. Iron bars produced moderate screening whereas graphite paint and metallic frame proved to have little effect.

Keywords
Electromagnetic fields, mitigation, radiofrequency, reduction, risk management, shielding
National Category
Other Environmental Engineering
Identifiers
urn:nbn:se:miun:diva-32586 (URN)10.7250/ste.2014.003 (DOI)
Available from: 2017-12-22 Created: 2017-12-22 Last updated: 2018-03-22Bibliographically approved
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