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

[携帯電話による皮膚温度の上昇：赤外線カメラによる研究] med./bio.

Skin temperature increase caused by a mobile phone: A methodological infrared camera study

著者: Straume A, Oftedal G, Johnsson A
掲載誌: Bioelectromagnetics 2005; 26 (6): 510-519
RISフォーマットで参考文献をダウンロード

携帯電話使用者は、よく耳元の灼熱感や熱感について苦情を訴える。温度上昇は電話による熱の絶縁によるもので、携帯電話の熱感は電力消費とRF周波数（RF）へのばく露によるものかもしれない。この研究の目的は、赤外線カメラを使って、こういった要因が、GSM900電話の使用によってどれだけの皮膚温上昇の原因になっているかを見いだすことである。健康な男性1名が被験者になった。男性は携帯電話オフでは、携帯電話を普通の姿勢で持ち、電源がオンの時には、無線ばく露を除去すべくアンテナを50Ω負荷に置き換えられ、RF場を送信している。出力電力は固定し、携帯電話の最小あるいは最大のパワーレベルを使用した。この研究は二重盲検で設計された。携帯電話使用後の15分、30分の温度変化をばく露されていない頭部に対して、ばく露されている頭部側で計算した。絶縁と電力パワー消費は、皮膚温に統計的に有意な上昇を招くが、RFへのばく露では見られなかった。

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研究目的（著者による）

The main aim of the study was to use experimental methods and an infrared camera to study how much the radiofrequency fields, the insulation (mobile phone was switched off) and the "electrical heating" (radiofrequency energy was absorbed) contribute to the rise in skin temperature during a mobile phone call.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 902.4 MHz
Modulation type: pulsed
ばく露時間: repeated exposure for 30 min, 6 times per day, on 5 consecutive days, see add. information
  • 電力: 0.21 W mean (maximum output power)
  • SAR: 0.81 W/kg average over mass (1 g) (in the cheek area)
  • SAR: 0.7 W/kg average over mass (1 g) (in the ear area)
  • 電力: 2 mW mean (minimum output power)

ばく露1

主たる特性
周波数 902.4 MHz
タイプ
  • electromagnetic field
ばく露時間 repeated exposure for 30 min, 6 times per day, on 5 consecutive days, see add. information
Modulation
Modulation type pulsed
Additional information

DTX mode was not activated.
ばく露装置
ばく露の発生源／構造
  • セルラ－電話
チャンバの詳細 Faraday cage constructed of aluminium plates
ばく露装置の詳細 The subject held the phone in soft contact with the pinna with the phone touching only the uppermost part of the cheek, hence there was a small gap between the phone and most of the cheek. The display of the phone was masked, and a plastic bag, taped to the top of the phone, covered the load and the cable.
Additional information The following power conditions were used: mobile phone switched off, mobile phone switched on at minimum and at maximum output power. All three conditions were applied both with the phone in the normal configuration and with the antenna being replaced by a 50 Ohm load to absorb the RF energy. When the 50 Ohm load was used, the SAR did not exceed the background level. The study was conducted on five consecutive days, each with six 30 min exposure sessions. The order of the different exposure conditions was changed (double-blind) from day to day. After five days, each condition had been presented at all the different times of the day. In addition, each condition had been preceded by each of the other conditions.
パラメータ
測定量 値 種別 Method Mass 備考
電力 0.21 W mean 測定値 - maximum output power
SAR 0.81 W/kg average over mass 測定値 1 g in the cheek area
SAR 0.7 W/kg average over mass 測定値 1 g in the ear area
電力 2 mW mean 測定値 - minimum output power
Additional parameter details

SAR values indicated are spatial peak values at maximum output power.

測定および計算の詳細

The average output power was measured by a power meter in series with a power sensor coupled to the antenna gate of the phone. SAR measurements have been made by Wilen et al. (see reference article) using the same test phone as in this study.

Reference articles

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:
調査の時期:
  • ばく露前
  • ばく露後

研究の主なアウトカム（著者による）

The insulation of the mobile phone and the electrical heating of the phone caused by power dissipation lead to statistically significant rises in the skin temperature, while the radiofrequency exposure did not.

研究の種別:

研究助成

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