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題名 | 室內光源對高能光子劑量計--CVD鑽石薄膜的熱發光影響=Indoor Light on Thermoluminescence of CVD Diamond Film used as a High Energy Photon Dosimeter |
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作者 | 畢祖平; 賴源淳; 劉幕台; 林招膨; 張東浩; 劉祺章; | 書刊名 | 中華放射線醫學雜誌 |
卷期 | 28:5 2003.10[民92.10] |
頁次 | 頁299-305 |
分類號 | 414.93 |
關鍵詞 | 聚合體鑽石薄膜; 輝光曲線; 光效應; 熱發光; CVD diamond; Glow curve; Light effect; Thermoluminescence; |
語文 | 中文(Chinese) |
中文摘要 | 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。 |
英文摘要 | 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. |
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