umu.sePublikasjoner
Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Radiofrequency fields: exposure, dose and health
Umeå universitet, Medicinska fakulteten, Institutionen för strålningsvetenskaper.
2002 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The overall aim of this thesis is to increase our knowledge of relevant exposure parameters when discussing possible health implication from exposure to radiofrequency electromagnetic fields (RF), especially effects that might occur at non-thermal levels.

In this thesis an effort is made to broaden the exposure assessment and to take the exposure time into account and combine it with the Specific Absorption Rate (SAR) and the field parameters (electric and magnetic field strength) to approach a dose concept.

In the first part of the thesis self-reported subjective symptoms among mobile phone users were studied. As a basis for this an epidemiological study among mobile phone users was completed with the main hypothesis that users of the digital transmission system GSM experience more symptoms than users of the older analogue NMT transmission system.

The hypothesis was falsified, but an interesting side finding was that people with longer calling time per day experienced more symptoms than people with shorter calling time per day. The time-aspect (long duration phone call etc.) was also found to be relevant for the occurrence of symptoms in association with mobile phone use as well as duration of symptoms. The new suggested dosimetric quantity Specific Absorption per Day (SAD), in which both calling time per day as well as the measured SAR1g are included showed a stronger association to the prevalence of some of the symptoms, such as dizziness, discomfort and warmth behind the ear compared to both CT and SAR1g alone.

In the second part whole body exposure conditions were considered. Methods to measure the induced current were examined in an experimental study, where different techniques were compared in different grounding conditions. The results were used in a study of operators of RF plastic sealers (RF operators) where the health status as well as the exposure were studied. The results showed that RF operators are a highly exposed group, which was confirmed by the fact that 16 out of 46 measured work places exceeded the ICNIRP guidelines. Headaches were found to be associated with the mean value of the time integrated E-field during a weld (E-weld) and the warmth sensations in the hands (warm hands) with the time integrated E-field exposure during one day (E-day).

The general findings in this thesis indicated that time should be included in the exposure assessment when studying non-thermal effects such as subjective symptoms in connection with RF exposure. The thesis proposes two different methods for doing this, namely timeintegrated exposure [V/m x t and A/m x t] and dose [J/kg].

sted, utgiver, år, opplag, sider
Umeå: Umeå universitet , 2002. , s. 45
Serie
Umeå University medical dissertations, ISSN 0346-6612 ; 808
Emneord [en]
electromagnetic fields, SAR, Specific Absorption, subjective symptoms
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-4ISBN: 91-7305-293-3 (tryckt)OAI: oai:DiVA.org:umu-4DiVA, id: diva2:143380
Disputas
2002-10-04, 00:00
Tilgjengelig fra: 2002-10-04 Laget: 2002-10-04 Sist oppdatert: 2018-06-09bibliografisk kontrollert
Delarbeid
1. Mobile phone use and subjective symptoms: Comparison of symptoms experienced by users of analogue and digital mobile phones
Åpne denne publikasjonen i ny fane eller vindu >>Mobile phone use and subjective symptoms: Comparison of symptoms experienced by users of analogue and digital mobile phones
2001 Inngår i: Occuptional medicine, ISSN 0962-7480, Vol. 51, nr 1, s. 25-35Artikkel i tidsskrift (Fagfellevurdert) Published
Identifikatorer
urn:nbn:se:umu:diva-4335 (URN)
Tilgjengelig fra: 2002-10-04 Laget: 2002-10-04bibliografisk kontrollert
2. Symptoms experienced in connection with mobile phone use.
Åpne denne publikasjonen i ny fane eller vindu >>Symptoms experienced in connection with mobile phone use.
2000 Inngår i: Occup Med, ISSN 0962-7480, Vol. 50, nr 4, s. 237-45Artikkel i tidsskrift (Fagfellevurdert) Published
Identifikatorer
urn:nbn:se:umu:diva-4336 (URN)
Tilgjengelig fra: 2002-10-04 Laget: 2002-10-04bibliografisk kontrollert
3. Subjective symptoms among mobile phone users: a consequence of absorption of radiofrequency fields?
Åpne denne publikasjonen i ny fane eller vindu >>Subjective symptoms among mobile phone users: a consequence of absorption of radiofrequency fields?
2003 (engelsk)Inngår i: Bioelectromagnetics, ISSN 0197-8462, E-ISSN 1521-186X, Vol. 24, nr 3, s. 152-159Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In a previous epidemiological study, where we studied the prevalence of subjective symptoms among mobile phone (MP) users, we found as an interesting side finding that the prevalence of many of the subjective symptoms increased with increasing calling time and number of calls per day. In this extrapolative study, we have selected 2402 people from the epidemiological study who used any of the four most common GSM MP. We used the information about the prevalence of symptoms, calling time per day, and number of calls per day and combined it with measurements of the Specific Absorption Rate (SAR). We defined three volumes in the head and measured the maximum SAR averaged over a cube of 1 g tissue (SAR(1g)) in each volume. Two new exposure parameters Specific Absorption per Day (SAD) and Specific Absorption per Call (SAC) have been devised and are obtained as combinations of SAR, calling time per day, and number of calls per day, respectively. The results indicates that SAR values >0.5 W/kg may be an important factor for the prevalence of some of the symptoms, especially in combination with long calling times per day.

sted, utgiver, år, opplag, sider
New York: , 2003
Emneord
SAR, specific absorption, headache, cellular phone
HSV kategori
Identifikatorer
urn:nbn:se:umu:diva-52364 (URN)10.1002/bem.10101 (DOI)000181883600001 ()12669297 (PubMedID)
Eksternt samarbeid:
Tilgjengelig fra: 2012-02-20 Laget: 2012-02-20 Sist oppdatert: 2018-06-08bibliografisk kontrollert
4. Induced current measurements in whole body exposure condition to radio frequency electric fields.
Åpne denne publikasjonen i ny fane eller vindu >>Induced current measurements in whole body exposure condition to radio frequency electric fields.
2001 Inngår i: Bioelectromagnetics, ISSN 0197-8462, Vol. 22, nr 8, s. 560-567Artikkel i tidsskrift (Fagfellevurdert) Published
Identifikatorer
urn:nbn:se:umu:diva-4338 (URN)
Tilgjengelig fra: 2002-10-04 Laget: 2002-10-04bibliografisk kontrollert
5. Electromagnetic field exposure and health among RF plastic sealer operators
Åpne denne publikasjonen i ny fane eller vindu >>Electromagnetic field exposure and health among RF plastic sealer operators
Vise andre…
2004 (engelsk)Inngår i: Bioelectromagnetics, ISSN 0197-8462, E-ISSN 1521-186X, Vol. 25, nr 1, s. 5-15Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Operators of RF plastic sealers (RF operators) are an occupational category highly exposed to radiofrequency electromagnetic fields. The aim of the present study was to make an appropriate exposure assessment of RF welding and examine the health status of the operators. In total, 35 RF operators and 37 controls were included. The leakage fields (electric and magnetic field strength) were measured, as well as induced and contact current. Information about welding time and productivity was used to calculate time integrated exposure. A neurophysiological examination and 24 h ECG were also carried out. The participants also had to answer a questionnaire about subjective symptoms. The measurements showed that RF operators were exposed to rather intense electric and magnetic fields. The mean values of the calculated 6 min, spatially averaged E and H field strengths, in line with ICNIRP reference levels, are 107 V/m and 0.24 A/m, respectively. The maximum measured field strengths were 2 kV/m and 1.5 A/m, respectively. The induced current in ankles and wrists varied, depending on the work situation, with a mean value of 101 mA and a maximum measured value of 1 A. In total, 11 out of 46 measured RF plastic sealers exceeded the ICNIRP reference levels. RF operators, especially the ready made clothing workers had a slightly disturbed two-point discrimination ability compared to a control group. A nonsignificant difference between RF operators and controls was found in the prevalence of subjective symptoms, but the time integrated exposure parameters seem to be of importance to the prevalence of some subjective symptoms: fatigue, headaches, and warmth sensations in the hands. Further, RF operators had a significantly lower heart rate (24 h registration) and more episodes of bradycardia compared to controls.

sted, utgiver, år, opplag, sider
New York: Alan R. Liss, Inc., 2004
Emneord
Adult, Arrhythmias, Cardiac, Body Burden, Comorbidity, Electromagnetic Fields, Fatigue, Female, Headache, Humans, Industry, Male, Occupational Exposure, Radiation Dosage, Radiation Injuries, Radiometry, Risk Assessment, Risk Factors, Sex Distribution, Sweden
HSV kategori
Identifikatorer
urn:nbn:se:umu:diva-7389 (URN)10.1002/bem.10154 (DOI)000187953300002 ()14696048 (PubMedID)
Eksternt samarbeid:
Tilgjengelig fra: 2008-01-09 Laget: 2008-01-09 Sist oppdatert: 2018-06-09bibliografisk kontrollert

Open Access i DiVA

fulltekst(308 kB)1344 nedlastinger
Filinformasjon
Fil FULLTEXT01.pdfFilstørrelse 308 kBChecksum SHA-1
94a0e50e0ac32c5ec6e589b91ddf2e46e83028f4c38b137e62b745a3a4e276a83f1fb9bc
Type fulltextMimetype application/pdf

Personposter BETA

Wilén, Jonna

Søk i DiVA

Av forfatter/redaktør
Wilén, Jonna
Av organisasjonen

Søk utenfor DiVA

GoogleGoogle Scholar
Totalt: 1344 nedlastinger
Antall nedlastinger er summen av alle nedlastinger av alle fulltekster. Det kan for eksempel være tidligere versjoner som er ikke lenger tilgjengelige

isbn
urn-nbn

Altmetric

isbn
urn-nbn
Totalt: 822 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf