(1. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長沙 410083；
2. 中南大學(xué) 有色金屬成礦預(yù)測教育部重點(diǎn)實(shí)驗室，長沙 410083；
3. 秋田大學(xué) 工學(xué)資源學(xué)研究院，環(huán)境資源研究中心，日本 秋田 010-8502)
摘 要: 利用質(zhì)子熒光分析(PIXE)方法在聚碳酸酯薄膜上測定了日本地質(zhì)調(diào)查局標(biāo)準(zhǔn)巖石和礦石樣品的化學(xué)組分，樣品為細(xì)粒、微量的(1~2 mg)粉末地質(zhì)樣品。PIXE測試的結(jié)果表明：對標(biāo)準(zhǔn)巖石樣品而言，具有0.4 μm孔徑薄膜的測定值與其他孔徑薄膜(0.2，0.6和0.8 μm)的測定值相比，其相對巖石標(biāo)樣的參考值變化更小，更適合作為理想樣靶被采用；對標(biāo)準(zhǔn)礦石樣品而言，0.2 μm孔徑薄膜的測定值與礦石標(biāo)樣的參考值相比，更適合作為理想的樣靶。日本地質(zhì)調(diào)查局標(biāo)準(zhǔn)巖石和礦石樣品測定的化學(xué)組分總是稍微不同于標(biāo)準(zhǔn)樣品的參考值，因此計算了測定值和參考值之間的校正因子，通過校正因子的調(diào)整，針對量少的巖石和礦石粉末樣品，就可以獲得較為精確的測試結(jié)果。
關(guān)鍵字: 質(zhì)子熒光分析(PIXE)；過濾薄膜；孔徑；校正因子
（1. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
2. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
3. Center for Geo-Environmental Science, Graduate School of Engineering and Resource Science,
Akita University, 1-1 Gakuen-Machi, Tegata, Akita 010-8502, Japan）
Abstract:Chemical analyses of fine-grained powder samples from the Geological Survey of Japan (GSJ) trapped on a polycarbonate filter were carried out by particle induced X-ray emission (PIXE) to measure the chemical compositions of geological samples having small amounts (1-2 mg). The variability of results obtained by using a filter with a pore size of 0.4 μm was smaller than the variability of results obtained by using filters with pore sizes of 0.2, 0.6 and 0.8 μm for rock samples. The results obtained by using filter with a pore size of 0.2 μm are better than the results obtained by using filters with pore sizes of 0.4, 0.6 and 0.8 μm for ore samples. The results of chemical analysis of powder samples of Japanese rock standards by PIXE are slightly different from certified values by the Geological Survey of Japan because of self-absorption of characteristic X-rays in measurements. Calibration factors were calculated on the basis of the measured values and certified values. The use of these calibration factors enables accurate results to be obtained for small amounts of powder samples of rocks and ores.
Key words: particle induced X-ray emission (PIXE); membrane filter; pore size; calibration factor
