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

[短報:携帯電話使用中の皮膚表面温度の計測] med./bio.

Measurements of skin surface temperature during mobile phone use.

掲載誌: Bioelectromagnetics 2007; 28 (2): 159-162

この研究は、携帯電話を6分間継続して被験者に使用させた後の顔の側面の温度上昇の最大値を測定した。測定に用いたのは、835MHz帯で作動するAMPSアナログ携帯電話2機種と900MHz帯で作動する初期のGSMデジタル電話3機種である。その結果、温度上昇の最大値はGSMで2.3℃、AMPS で4.5℃であり、両方とも頬に生じた;AMPSとGSMでの温度上昇の差は、平均稼動電力の最大値がAMPS (600 mW)の方がGSM900 (250 mW)より高いためと考えられる;AMPSでは、頬の一点の温度変化は、作動なし(-0.7 ℃)、最大出力送信時(+2.6 ℃)、スタンドバイモード(+2.0 ℃)であった、と報告している。

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研究目的(著者による)

To measure temperature rises on the side of the face after 6 minutes of continuous mobile phone operation using two models of analog mobile phone system phones (operating in the 835 MHz band) and three GSM mobile phone models operating in the 900 MHz band.

詳細情報

Additionally, the temperature on the side of the face for analog mobile phone system phones while it was inoperative, transmitting, and in stand-by mode was measured in order to separate the contributions to heating from the radiofrequency amplifier and control electronics.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 835 MHz
ばく露時間: continuous for 6 min
ばく露2: 900 MHz
ばく露時間: continuous for 6 min

General information

The tests were performed on three GSM and two AMPS phone models that were in use in the mid-1990s and may not be representative of current designs or battery technologies. If the phone had an extendable antenna this was pulled out during the measurements.

ばく露1

主たる特性
周波数 835 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 6 min
ばく露装置
ばく露の発生源/構造
  • セルラ-電話
  • AMPS, at full power
チャンバの詳細 The subject sat on a chair in a semi-anechoic chamber during exposure and warm-up period.
ばく露装置の詳細 Immediately following a 15 min warm-up period, the phone in test mode transmitting at full power was held loosely with the fingers by the subject against the right hand side of his head and touched the skin in the typical use position for a period of 6 min.
Additional information An additional comparative test was performed with one of the AMPS phones while it was inoperative, transmitting, and in stand-by mode in order to separate the contributions from the RF amplifier and control electronics.
パラメータ
測定量 種別 Method Mass 備考
電力 600 mW mean - - -

ばく露2

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 6 min
ばく露装置
ばく露の発生源/構造
  • セルラ-電話
  • GSM, at full power
パラメータ
測定量 種別 Method Mass 備考
電力 250 mW mean - - -

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
  • skin
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)

For the GSM mobile phones the highest recorded temperature rise difference was 2.3°C and for the analog mobile phone system phones it was 4.5°C. The higher differential temperature rise between the two mobile phone systems may reflect the higher maximum average operating power of analog mobile phone (600 mW) versus GSM 900 (250 mW).
Additionally, comparison of temperature changes at a consistent location on the cheek for an analog mobile phone system phone showed that it was -0.7°C for inoperative status (i.e. cooler than the left control cheek side), +2.6°C for transmitting at full power and in stand-by mode +2.0°C.

研究の種別:

研究助成

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