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

[5頭の捕獲された若いトド（Eumetopias jubatus）、同数の家畜の若いブタ（Sus scrofa）およびヒツジ（Ovis aries）の頭皮の0.1-10GHzでの誘電特性] med./bio.

The dielectric properties of the cranial skin of five young captive Steller sea lions (Eumetopias jubatus), and a similar number of young domestic pigs (Sus scrofa) and sheep (Ovis aries) between 0.1 and 10 GHz

著者: Olawale KO, Petrell RJ, Michelson DG, Trites AW
掲載誌: Physiol Meas 2005; 26 (5): 627-637
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この研究は、長期観察のためのRFIDタグを植え込むための基礎データとして、若いメスのアシカ（n = 5）の頭皮の誘電特性を周波数範囲0.1-10 GHzで測定した。同様に、ブタ（Sus scrofa：n = 5）およびヒツジ（Ovis aries：n = 5）の頭の付け根部分（タグの埋め込み部位）も測定した。結果として、得られたデータの周波数曲線の形状は、ヒト成人の皮膚データに類似していたが、値は全般的に低値であった；測定した個体間での変動は、すべての種で認められた、と報告している。なお、RFIDタグの回路は、損失の多い媒質または皮膚、さらに誘電特性の変動の結果として起きるアンテナの離調を考慮して設計されると付言している。

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研究目的（著者による）

To study the dielectric properties of the cranial skin of non-sexually mature Steller sea lions, and domesticated pigs and sheep over a frequency range of 0.1-10 GHz at the base of their heads where a identification tag will be implanted.

詳細情報

Radiofrequency tags are used to help to determine why Steller sea lions are declining by monitoring the movements and survivorship of the young otariids. Knowing the dielectric properties of young Steller sea lions is important, as they are key parameters in electromagnetic irradiation models used in antenna design.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 0.1–10 GHz -

ばく露1

主たる特性
周波数 0.1–10 GHz
Additional information Reference Article: Popovic D and Okoniewski M 2003 Response characterization of the precision open-ended coaxial probe for dielectric spectroscopy of breast tissue IEEE Antennas and Propagation Society Int. Symp. vol 4 54¿7
ばく露装置
ばく露の発生源／構造
  • specially constructed open-ended coaxial dielectric probe
Distance between measurement device and exposed object 0 mm
チャンバの詳細 The porcine subjects were tested within heated laboratories, while the other subjects were tested in unheated research areas adjacent to their cages.
ばく露装置の詳細 On each subject, four sites on the back of the head and behind the coronal suture (proposed implant site) were measured. The sites formed a rectangle of size 5 cm Œ 3 cm. These four sites were numbered and kept consistent across different test subjects by placing a cardboard template on the same head position. Time restrictions (due to the anesthetics, 30¿60 min) permitted two repetitions per position in the otariids and three to four in the other subjects.
パラメータ

No parameters are specified for this exposure.

測定および計算の詳細

A vector network analyzer (VNA) (Agilent 8720ES) and a specially constructed open-ended coaxial dielectric probe with an internal radius of 0.298 mm and an outer radius of 2.5 mm were used. The probe was built out of several sections of coaxial lines, and the final section at the probe aperture is a 2.3 mm borosilicate glass line, hermetically sealed to the stainless steel metal conductors (for additional details see Popovic and Okoniewski (2003)). The borosilicate glass probe did not have a ground plane.

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:
  • ばく露中

研究の主なアウトカム（著者による）

The resulting curves of all animals were similar in shape to each other and to the curves generated from human skin, but the values were generally lower. The values varied with subject and, in the case of the porcine subject, with age.

研究の種別:

研究助成