Developmental of high precision incremental heating device for Ar-Ar single mineral dating

对于高可靠的Ar-Ar定年来说，分析单一矿物的气相馏分中的Ar同位素是非常重要的。本研究利用激光探头加热仪和红外测温仪研制了一种高精度增温装置，并将其应用于Ar-Ar单矿物测年。我们购买了红外测温仪的主要设备，并用它和原激光测头加热设备进行了基础实验。即将开发的新装置使仅使用红外温度计的中温探测器就可以测量高温范围成为可能，尽管商用红外温度计需要高温探测器来测量温度。这个案例遵循了我们最初的想法，即使用特定的滤光片来测量高温。在对通过滤光器的红外线的能量损失进行校准时，我们使用…莫尔没有选择重写安装在转换器中的程序，而是在真实温度和输出电压之间制作了一条校准曲线。这使得精确和轻松地测量激光增量加热控制的样品温度成为可能。这项技术已经应用于天然样品的Ar-Ar矿物测年，并在会议上公布了一些结果。在进行这个项目的过程中，有一个副产品，我们不得不对这个项目的内容进行了轻微的修改。这使得我们认识到一种经济但精确的四重质谱仪，用于定性和定量分析从中温范围内的样品中提取的气体物种。这种质谱计可以立即测量强度随时间变化很快的气体物种的质量谱，并估计气体进入质谱计时零时每种气体物种的绝对丰度。在高可靠的Ar-Ar测年中，需要对多个增量加热气体组分进行年龄谱测量，这要求减少每一组分的分析时间。这种新的质谱计使得在将气体引入质谱仪之前评估气体净化时间成为可能。较少

It is most important to analyze argon isotopes in gas phase fractions extracted from a single mineral by incremental heating for highly reliable Ar-Ar dating. This study is to develop a high precision incremental heating device with the temperature control system by using a laser probe heating apparatus and an infrared thermometer and to apply it to Ar-Ar single mineral dating. We have bought the main apparatuse of an infrared thermometer and then carried out the basic experiments using it and the former laser probe heating apparatuse. The new device to be developed makes it possible to measure the high temperature range using only the detector for medium temperature of infrared thermometer though the commercial base infrared thermometer has required the high temperature detector to measure the temperatures. This case follows our original idea to use a specific filter in measuring the high temperatures. In the calibration for energy loss of infrared rays coming through the filfter, we … More did not choose to re-write the program installed in the converter and does in stead to make a calibration curve between the true temperature and the out put voltage. This makes it possible to measure precisely and easily the sample temperatures controlled by laser incremental heating. This technique has been applied to Ar-Ar mineral dating of natural samples and some results have been presented at conferences.In proceeding this project, there is a by-product ; we had to modify slightly the content of this project. This lead us to recognize a economical but precise quadruple mass spectrometer for qualitative and quantitative analyzes of gas species extracted from specimens in meddium temperature range. This mass spectrometer makes it possible to measure immediately mass spector of gas species of which the intensity change quickly in time and to estimate the absolute abundance of each gas species at the time zero when the gas was introduced into the mass spectrometer. In highly reliable Ar-Ar dating, it is neccessary to take the age spectrum for many incremental heating gas fractions, requiring decreasing of analysing time of each fraction. This new mass spectrometer makes it possible to evaluate the gas purification time before introducing the gas into mass spectrometer. Less