この研究は、マイクロ波（900MHz）ばく露によりラットの蝸牛上皮に生じる音響的な耳の機能への影響の可能性を調べた。そのための実験装置を開発し、聴覚損傷との客観的で器質的な相関を探求した。雄のSprague-Dawleyラットを用い、立方体チャンバー内での遠方界ばく露による2つのSARで実験を行なった。結果として、2つのSARのどちらにおいても、統計的に有意な証拠は得られなかった；ばく露装置および診断装置は、聴覚系への潜在的な影響の研究に極めて有用であったが、これらの実験で採用されたパラメータについて、証拠は観察されなかった、と報告している。
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To assess potential changes occuring in the cochlear receptor after exposure to electromagnetic fields of a given frequency (around 900 MHz) and a low intensity.
A cubic chamber was developed and a routine acoustic apparatus employed to observe otofunctional effects. In this paper, the methodological approach and the experimental set-up are described, and the first preliminary results of the cochlear receptor functionality are reported.
| ばく露 | パラメータ |
|---|---|
|
ばく露1:
950 MHz
Modulation type:
CW
ばく露時間:
repeated daily exposure, 3 h/day, for 3 days
|
|
|
ばく露2:
936 MHz
Modulation type:
CW
ばく露時間:
repeated daily exposure, 3 h/day, for 5 days
|
| 周波数 | 950 MHz |
|---|---|
| タイプ |
|
| 特性 |
|
| ばく露時間 | repeated daily exposure, 3 h/day, for 3 days |
| Additional information | vertical polarisation |
| Modulation type | CW |
|---|
| ばく露の発生源／構造 |
|
|---|---|
| Distance between exposed object and exposure source | 65 cm |
| チャンバの詳細 | cubic chamber (side 1.2 m) shielded with copper sheets and lined with RF absorbing material (-20 dB) |
| ばく露装置の詳細 | Eight rats immobilised in cylindrical (D=4.5 cm, L=12 cm) Lucite jigs, ending with a cone, were positioned with their heads facing the mouth of the antenna at 65 cm and their longitudinal axis oriented along the direction of propagation. There were two arrays of four jigs at 50 and 60 cm from the ground over an acrylic support. |
| Sham exposure | A sham exposure was conducted. |
| Additional information | Fiberoptic thermosensors were placed on the skin of one rat in the jig during the first day of exposure to monitor any change of temperature. |
| 周波数 | 936 MHz |
|---|---|
| タイプ |
|
| 特性 |
|
| ばく露時間 | repeated daily exposure, 3 h/day, for 5 days |
| Additional information | vertical polarisation |
| Modulation type | CW |
|---|
| ばく露の発生源／構造 |
|
|---|---|
| Distance between exposed object and exposure source | 65 cm |
| Sham exposure | A sham exposure was conducted. |
The exposure system and the diagnostic apparatus are extremely useful to investigate a potential effect on the auditory system. However, with the parameters applied in these experiments, no evidence for a biological effect was observed.
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