研究のタイプ: 工学技術/ドシメトリの研究 (experimental study)

[低強度UHFパルスエネルギーに関連する脳幹誘発反応] med./bio.

Brain stem evoked responses associated with low-intensity pulsed UHF energy.

掲載誌: J Appl Physiol 1967; 23 (6): 984-988

この研究は、低電力密度パルス変調超高周波UHF)電磁エネルギーをネコの頭部に照射し、脳幹誘発電位を記録した。搬送周波数は1.2–1.525 GHz、1回のばく露は60000パルスとした。結果として、誘発反応に必要な電力密度平均は30 µW/cm²、ピーク値は60 mW /cm²であった:測定された電位は、アーチファクトではなく、神経的なものであることを確認した;電磁波吸収材でネコの全身、頭部または体幹をシールドする実験により、誘発反応を得るためには頭部のUHFばく露が必要であることが示された;実験した周波数範囲では、最高の周波数で誘発効果の低下が観察された;電力密度の変動は誘発電位に明確に影響した;偏波(脊髄に並行または垂直)は大きく影響しないように見えたが、明白ではない;パルス繰り返し周波数が約50パルス/秒を超えるまでは、これの変化で誘発反応は大きく変化しなかったが、超えると、一連の刺激誘発される活動の重複が起こることが多い、と報告している。

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研究目的(著者による)

The study was designed to be a parametric study of the effect of low-intensity pulse modulated ultra high frequency (UHF) energy on the functioning of the central nervous system. In this report, it is demonstrated that pulse modulated UHF energy at low power densities evokes potentials in the brain stem. The required experimental conditions are defined.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 1.2–1.525 GHz
Modulation type: pulsed
ばく露時間: more than 60000 pulses per session; exposures alternated with rest periods of 5 min

ばく露1

主たる特性
周波数 1.2–1.525 GHz
ばく露時間 more than 60000 pulses per session; exposures alternated with rest periods of 5 min
Additional information 1.2 GHz, 1.3 Ghz; 1.425 GHz, 1.525 GHz
Modulation
Modulation type pulsed
Pulse width 10 µs
Packets per second 130
Additional information

12, 24, 36, 80, 130 pps

ばく露装置
ばく露の発生源/構造
Distance between exposed object and exposure source 0.5 m
チャンバの詳細 non reflecting ecosorb test enclosure
パラメータ
測定量 種別 Method Mass 備考
電力密度 30 µW/cm² mean 備考を参照のこと。 - -
電力密度 600 W/m² peak 備考を参照のこと。 - -

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:
調査の時期:
  • ばく露中

研究の主なアウトカム(著者による)

Evoked potentials in the brain stem were induced by illumination with pulse modulated UHF energy. The threshold power density necessary to evoke the responses was approximately 30 µW/cm² average and 60 mW/cm² peak. The results indicate that the potentials were neural rather than an artifact of the situation. Using an echosorb shield to cover the entire cat, or head, or body, it was found that the head must be exposed to the UHF energy in order to have an effect occur. Within the carrier-frequency range used (1.2-1.525 GHz), there seemed to be a reduction of effect at the highest frequency. Variation in power density has a distinct effect on the evoked potentials. Polarization of the energy, whether perpendicular or parallel to the spine, does not seem to have much effect though this is not unequivocal. As pulse-repetition frequency is changed, the evoked response does not change significantly until the pulse-repetition frequency is greater than approximately 50 pulses/sec. When greater than this, there is often an overlap of activity evoked by the series of stimuli.

研究の種別:

研究助成