この研究は、ケタミン麻酔をかけたSprague-Dawleyラットに、1200 MHz連続波(RFR)の遠方界ばく露を、電磁界のEおよびH方向をそれぞれ体軸に平行にした条件で実施し、生理学的影響を比較した。どちらの条件でも全身平均比吸収率(SAR)を約8 W/kgで等価とするため、E方向ばく露には電力密度20 mW/cm2、H方向ばく露には45 mW/cm2を用いた。同じラットにおいて、2つの条件で、ばく露を断続的に行い、38.5から39.5℃への結腸温度上昇を反復的に生じさせた。その結果、E方向の条件において、結腸、鼓膜、左体側皮下(RF源に近い側)、尾部の加熱が大きかった;E方向およびH方向での2450 MHばく露を行った先行研究の結果に比べ、熱分布の一様性が大きかった;心拍数および血圧への影響については、E方向とH方向の間に有意差はなかった;このことは、2450MHzで見られたような、より大きな末梢の加熱が、これらの差を生じさせるために必要であることを示唆する、と報告している。
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To determine the effects of 1200 MHz irradiation on patterns of heat disposition, heart rate, blood pressure, and respiratory rate in anesthetized rats in E orientation (long axis of body parallel to electric field) and H orientation (long axis of body parallel to magnetic field).
ばく露 | パラメータ |
---|---|
ばく露1:
1.2 GHz
Modulation type:
CW
ばく露時間:
until the temperature had risen from 38.5° to 39.5°
|
|
ばく露2:
1.2 GHz
Modulation type:
CW
ばく露時間:
until the temperature had risen from 38.5° to 39.5°
|
*The exposure was discontinued when the colonic temperature increased to 39.5°C and it was initiated again when the temperature returned to 38.5°C. This procedure was continued for 3 cycles
周波数 | 1.2 GHz |
---|---|
タイプ |
|
特性 |
|
偏波 |
|
ばく露時間 | until the temperature had risen from 38.5° to 39.5° |
Additional information | Animals were exposed in E orientation (long body axis of the animals parallel to the electric field) |
Modulation type | CW |
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ばく露の発生源/構造 | |
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Distance between exposed object and exposure source | 1.7 m |
チャンバの詳細 | Eccosorb RF-shield anechoic chamber |
ばく露装置の詳細 | Animals placed on a holder which consisted of seven 0.5 cm (outside diameter) Plexiglas rods mounted in a semicircular pattern on 4 cm x 6 cm Plexiglas plates (0.5 cm thick). |
周波数 | 1.2 GHz |
---|---|
タイプ |
|
特性 |
|
偏波 |
|
ばく露時間 | until the temperature had risen from 38.5° to 39.5° |
Additional information | Animals were exposed in H orientation (long body axis of the animals parallel to the electric field) |
Modulation type | CW |
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ばく露の発生源/構造 |
|
---|---|
Distance between exposed object and exposure source | 1.7 m |
Exposure in E-orientation resulted in greater colonic, tympanic, left subcutaneous (side toward antenna), and tail heating. The findings indicated a more uniform distribution of heat than that which occurred in previous experiments of 2450-MHz irradiation in E- and H-orientation (publication 2239). A lack of significant differences in blood pressure and heart rate responses between exposures in the two orientations in this investigation suggest that greater peripheral heating, as observed in the earlier study of 2450 MHz, is necessary for these differences to occur.
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