研究のタイプ: 医学/生物学の研究 (experimental study)

[パルス波およびと連続波の最大周波数(マイクロ波)放射の内耳への生物学的影響] med./bio.

[Biological effect of pulsed and continuous maximum-frequency (microwave) radiation on the inner ear].

Federal Institute for Occupational Safety and Health and Occupational Medicine (BAuA)
2004, Schriftenreihe der Bundesanstalt für Arbeitsschutz und Arbeitsmedizin FB1019: 1-64

この研究は、GSM携帯電話から放射される高周波(HF)電磁界が、前庭および聴覚系感覚器がある内耳に与える生物学的影響を調べた。影響評価には、サーモグラフィー記録、ビデオ式眼振計測記録、聴性脳幹反応、歪成分耳音響放射(DPOAE)を用いた。その結果、さまざまなモデルおよびヒト側頭骨に対して行ったサーモグラフィー検査は、携帯電話が聴覚および前庭系にとって意味のある刺激をもたらすような温度上昇を誘発しないことを示した;電磁界下でのビデオ眼振記録は、パルス波および連続波のHF電磁界のどちらも前庭反応を引き起こさないことを示した;電磁界ばく露中の聴性脳幹反応の記録(24耳)は、電磁界ばく露なしでの記録に比較して、どのパラメータの変化も示さなかった(I、III、V波ピークの絶対潜時、およびIとV間のピーク間潜時など);DPOAEの記録(20耳)においても、HFによるスペクトルまたは放射レベルへの影響は見られなかった、と報告している。

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研究目的(著者による)

To study the biological effects of high frequency irradiation produced by the GSM mobile phone on the inner ear with its sensors of the vestibular and auditory systems.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 889.6 MHz
Modulation type: CW
ばく露時間: continuous for about 1, 2, or 3 min per ear depending on the examination
  • 電力: 255 mW mean
  • SAR: 1.25 W/kg average over mass (1 g)
  • SAR: 0.77 W/kg average over mass (10 g)
ばく露2: 889.6 MHz
Modulation type: pulsed
ばく露時間: continuous for about 1, 2, or 3 min per ear depending on the examination
  • 電力: 2.2 W peak
  • 電力: 255 mW mean
  • SAR: 1.25 W/kg average over mass (1 g)
  • SAR: 0.77 W/kg average over mass (10 g)
ばく露3: 889.6 MHz
Modulation type: CW
ばく露時間: continuous for 14, 16, 18, 22, or 23 min depending on the material
  • 電力: 255 mW mean
  • SAR: 1.25 W/kg average over mass (1 g)
  • SAR: 0.77 W/kg average over mass (10 g)
ばく露4: 889.6 MHz
Modulation type: pulsed
ばく露時間: continuous for 15, 16, 18, or 31 min depending on the material
  • 電力: 2.2 W peak
  • 電力: 255 mW mean
  • SAR: 1.25 W/kg average over mass (1 g)
  • SAR: 0.77 W/kg average over mass (10 g)

ばく露1

主たる特性
周波数 889.6 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for about 1, 2, or 3 min per ear depending on the examination
Modulation
Modulation type CW
ばく露装置
ばく露の発生源/構造
  • セルラ-電話
ばく露装置の詳細 The exposure setup for test persons consisted of two mobile phones that were prepared for external feeding from a signal generator and a broadband power amplifier via a coaxial cable with additional shield surface wave suppression. The mobile phones were attached to adjustable non-conductive holders mounted on a chair for test persons. The phone on the examined side was activated by a coaxial relay.
Additional information SAR and penetration were measured according to ES 59006 (CENELEC 1998) with the aid of flat and real size head phantoms and the phone in the "intended use position". The highest SAR value was detected at the root point of the antenna.
パラメータ
測定量 種別 Method Mass 備考
電力 255 mW mean 測定値 - -
SAR 1.25 W/kg average over mass 測定値 1 g -
SAR 0.77 W/kg average over mass 測定値 10 g -

ばく露2

主たる特性
周波数 889.6 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for about 1, 2, or 3 min per ear depending on the examination
Modulation
Modulation type pulsed
Pulse width 576 µs
Duty cycle 12.5 %
Repetition frequency 217 Hz
ばく露装置
ばく露の発生源/構造
  • E1と同じ装置
パラメータ
測定量 種別 Method Mass 備考
電力 2.2 W peak 測定値 - -
電力 255 mW mean 測定値 - -
SAR 1.25 W/kg average over mass 測定値 1 g -
SAR 0.77 W/kg average over mass 測定値 10 g -

ばく露3

主たる特性
周波数 889.6 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 14, 16, 18, 22, or 23 min depending on the material
Modulation
Modulation type CW
ばく露装置
ばく露の発生源/構造
  • セルラ-電話
ばく露装置の詳細 For the exposure of samples during thermography a mobile phone was positioned horizontally at a distance of 3 cm parallel to the edge of the wooden worktop of a trolley. Samples were placed in a dish of Piacryl (with walls of 2 mm), the bottom of which was 5 mm apart from the casing and (according to the shape) farther from the antenna of the mobile phone.
Additional information Measurements were made with the mobile phone alone, with an absorbing foil, with animal tissue (sausage slice), and with pars petrosa of the human temporal bone (dry and wet).
パラメータ
測定量 種別 Method Mass 備考
電力 255 mW mean 測定値 - -
SAR 1.25 W/kg average over mass 測定値 1 g -
SAR 0.77 W/kg average over mass 測定値 10 g -

ばく露4

主たる特性
周波数 889.6 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 15, 16, 18, or 31 min depending on the material
Modulation
Modulation type pulsed
Pulse width 576 µs
Duty cycle 12.5 %
Repetition frequency 217 Hz
ばく露装置
ばく露の発生源/構造
  • same setup as in E3
パラメータ
測定量 種別 Method Mass 備考
電力 2.2 W peak 測定値 - -
電力 255 mW mean 測定値 - -
SAR 1.25 W/kg average over mass 測定値 1 g -
SAR 0.77 W/kg average over mass 測定値 10 g -

ばく露を受けた生物:

方法 影響評価項目/測定パラメータ/方法

研究対象とした生物試料:
研究対象とした臓器系:
  • 感覚器
  • ear
調査の時期:
  • ばく露前
  • ばく露中
  • ばく露後

研究の主なアウトカム(著者による)

The thermographic investigations made on various model materials and on the human temporal bone indicate that the mobile phone does not induce any increases of temperature which would lead to a relevant stimulus for the auditory and vestibular system.
Video-nystagmographic recordings under electromagnetic field exposure did not result in vestibular reactions generated by electromagnetic field exposure, neither for the pulsed nor for the continuous high frequency field.
Compared with the recording without electromagnetic field, the brainstem electric response audiometry tests under electromagnetic field exposure of 24 ears (12 subjects) did not reveal any changes of the parameters investigated, i.e. absolute latency of the peaks I, III, V and the interpeak latency between the peaks I and V.
The distortion product otoacoustic emissions (DPOAE) recorded on 20 ears (10 subjects) do not indicate, comparing the three measuring situations, i.e. "before electromagnetic field exposure", "pulsed electromagnetic field exposure" and "continuous electromagnetic field exposure", any possible impacts of the high-frequency electromagnetic field on the spectrum or levels of otoacoustic emissions for none of the subjects.
The data show that the electromagnetic fields generated in using the mobile phone do not have an effect on the inner ear and auditory system to the colliculus inferior in the brainstem and on the vestibular receptors in the inner ear and the vestibular system.

研究の種別:

研究助成

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