室內光源對高能光子劑量計─CVD鑽石薄膜的熱發光影響

聚合晶體鑽石薄膜（polycrystalline diamond film）乃是利用化學氣相沈積法（chemical vapor deposition, CVD）所合成的，其應用已行之有年，使用之方法與熱發光劑量計（thermoluminescence dosimeter, TLD）相似。本研究主要是探討光線對於聚合晶體CVD鑽石薄膜的光效應影響。與受0.5戈雷（Gy）高能光子的照射相比，當CVD鑽石薄膜受到桌燈燈泡照射15分鐘，便會產生明顯的熱發光。這種由於光線所誘發的熱發光會在兩小時內達到飽和，其飽和的光強度與光線的頻率有關。而其輝光曲線的尖峰有兩處，一處是位於605K的溫度點，另一處則位於410K的溫度點。熱發光於605K的尖峰強度幾乎不受光線照射影響但受高能光子照設劑量的影響，另一個位於410K的尖峰強度則幾乎是光線所造成。光線的影響可以輕易的以數值分析或實驗的方法來區別。我們建議使用具有綠色燈罩或是純紅色的燈做為室內燈源，以減少光線對結果所造成的影響，而在記讀之前進行預熱也是可行的方法。

關鍵字

聚合體鑽石薄膜；輝光曲線；光效應；熱發光

並列摘要

The effect of light on polycrystalline diamond film that produced by chemical vapor deposition (CVD) and used as a thermoluminescent dosimeter (TLD) should be considered although some literature has indicated that such an effect was theoretically unlikely to happen. A 15 min exposure to a normal desk light bulb induces significant thermoluminescence (TL) comparable to a 0.5 Gy exposure to high-energy photons. This light-induced TL will be saturated within 2 hours. The saturated TL intensity depends on the frequency of the light and blue light dominates. The TL peak area at a temperature of 605 K is insensitive to light but sensitive to high-energy photons. Another peak at about 410 K is caused by light only because the TL from ionization radiation at the same location is bleached. The effect of light could be easily distinguished by a numerical or experimental method. Lamps with a green lampshade or pure red lights are suggested for use as indoor light sources. To reduce the effect of light, preheating before readout is also suggested.

並列關鍵字

CVD diamond ； glow curve ； light effect ； thermoluminescence

國際替代計量

室內光源對高能光子劑量計─CVD鑽石薄膜的熱發光影響

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