| Summary: | 碩士 === 國立清華大學 === 原子科學系 === 88 === Because of the industrial activities by human beings, especially the extraction and mining of mines, the radioactive nuclides could be enhanced to the products, therefore increase radiation dose to the public.
Aggregate is a by-product of the titanium dioxide production process. Since the ore contains trace amount of naturally occurred radioactive uranium, thorium and potassium, these radioactive nuclides are inevitably carried over to the aggregate.
In this research, we study into the radiation characteristics of the aggregate by determining it's constituent of naturally occurred radioactive material in order to know if it could cause the extra radiation does to the public.
The research was divided into two major parts as follows : (1) to assess the response of the ore density to the efficiency of the HPGe Detector using a sample standard, and find out it's efficiency regression straight line by experiment; (2) to analyze the naturally occurred radioactive uranium, thorium and potassium of titanium ore in quality and quantity, and trying to find the relationship in the same sort of titanium ore.
The results show : (1) the efficiency of the gamma energy will decreases as the density of titanium ore increases. (2) the constituent of the naturally occurred radioactive nuclides in titanium ore has a wildly distributed, but there is a fixed correlation in the same sort of ore. (3) there is the high quantity contained of the radioactive thorium in aggregate available, so it can't be used as a building material, and need to improve the radiation hazard for making their commercial application.
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