研究生: |
翁小晴 Hsiao-Ching, Weng |
---|---|
論文名稱: |
以粒子誘發X射線進行北投石成份研究 Studying Hokutolite by Particle Induced X-ray Emission |
指導教授: |
吳秀錦
Hsiu-Chin, Wu |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
理學院 - 物理學系 Department of Physics |
論文出版年: | 2004 |
畢業學年度: | 92 |
語文別: | 中文 |
論文頁數: | 63 |
中文關鍵詞: | 北投石 、粒子誘發X射線 |
外文關鍵詞: | PIXE, Hokutolite, Particle Induced X-ray Emission |
相關次數: | 點閱:2 下載:0 |
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摘要
北投石是大部份沈積在安山岩上面,具有放射性的溫泉生成礦物。目前,全世界只有在台灣的北投溫泉,以及日本的澀黑溫泉發現其蹤跡。北投石的主要成份是硫酸鋇和硫酸鉛的固溶體。一般文獻指出,台灣北投石所含鋇與鉛重量比約在0.6-1.8,1.5-2.5之間;而日本北投石所含鋇與鉛重量比約在3.7-3.8之間。
本實驗以粒子誘發X射線( PIXE)量測台灣北投石,得到鋇與鉛重量比約在0.7-1.45之間。另外,我們以PIXE量測天然安山岩,和放置在北投溪水中一個半月的安山岩(簡稱人為北投石),得到他們成份中鋇與鉛的重量比平均值分別為:0.23與0.32。推測放置在北投溪水中一個半月之天然安山岩,表面已開始被北投溪水之沈積物-北投石,所附著。
另外,我們分別在北投溪源頭(地熱谷)及中下游取水,進行放射性核種224Ra之γ射線量測,得知地熱谷源頭224Ra的活度約3.5 Bq/L,中下游224Ra的活度約1.1 Bq/L。推測中下游的北投溪已被民生用水或雨水等稀釋(約1/3)。
Abstract
Hokutolite, a sediment on Andesite, is a radiative mineral. At present it is only found at Peitou Hot Spring in Taiwan and Tamagawa Hot Spring in Japan. The main composition of Hokutolite is a solid solution of barium sulfate and lead sulfate. Previous studies have shown that the weight ratio of Ba to Pb in Hokutolite from Taiwan is either 0.6-1.8 or 1.5-2.5. On the contrary, the weight ratio of Ba to Pb in Hokutolite from Japan is about 3.7-3.8.
Using Particle Induced X-ray Emission, we obtained that the weight ratio of Ba and Pb in Hokutolite from Taiwan is about 0.7-1.45. However, Andesite and “Artificial Hokutolite” (Andesite sunk in Peito Hot Spring for one and a half months) are also be analyzed. The Ba/Pb weight ratio of Andesite and “Artificial Hokutolite” are 0.23 and 0.32, respectively. Thus, we hypothesize that Hokutolite has started to deposit on the “Artificial Hokutolite” in the month and half of our experiment.
In addition, we analyzed theγ-ray of radionuclide 224Ra in the water issuing from the source and downstream. The radioactivities at these two locations are 3.5Bq/L and1.1Bq/L, respectively. From this we estimate that the Hot Spring is diluted to about 1/3 by domestic sewage and rainfall.
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