Anomalous contact angle of water droplets on the proton irradiated PADC track detectors

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Other Title
  • プロトン照射したPADC検出器表面上液滴の接触角異常
  • プロトン ショウシャシタ PADC ケンシュツキ ヒョウメンジョウ エキテキ ノ セッショクカク
  • プロトン ショウシャシタ PADC ケンシュツキ ヒョウメン ジョウ エキテキ ノ セッショクカク イジョウ

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Description

Anomalous behavior has been observed on the contact angle of water droplets on PADC, poly (allyl diglycol carbonate), nuclear track detectors which is exposed to proton beams. The angel reaches to the maximum value of 89 degree from the original value of 70 degree without the exposure at a fluence of 1.0x1013 ions/cm2.In the case of heavy ion irradiations by He, C and Xe ions, the angle decreases with increasing the fluence. Similar results have been observed for gamma irradiations, UV irradiations and the exposure to corona discharge. In order to evaluate the surface structure, XPS observations were made for PADC, in which X ray irradiation are simultaneously conducted. The polyethylene like network is more radiation tolerance than the ether and carbonate ester bonds which are in the repeat units. The observed anomalous behavior of the track angle is discussed from the point of views of track core size and spatial distribution on the PADC.

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