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

增量加热法提取单矿物气相组分中的氩同位素分析是高可靠性Ar-Ar定年的关键。本研究利用激光探针加热装置和红外测温仪，研制了一种具有温度控制系统的高精度增量加热装置，并将其应用于Ar-Ar单矿物定年。我们购买了红外测温仪的主体装置，并利用它和原激光探头加热装置进行了基础实验。虽然商用基础红外温度计需要高温探测器来测量温度，但开发的新装置可以仅使用红外温度计的中温探测器来测量高温范围。这种情况下，遵循我们的原始想法，使用特定的过滤器在测量高温。在红外线通过滤光片的能量损失标定中， ...更多信息 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绘制校准曲线。这使得通过激光增量加热控制的样品温度的精确和容易的测量成为可能。该技术已应用于天然样品的Ar-Ar矿物定年，并在会议上发表了一些结果。在进行该项目的过程中，有一个副产品，我们不得不对该项目的内容作一些修改。这使我们认识到一种经济而精确的四极质谱计，用于中温区样品中提取的气体组分的定性和定量分析。该质谱仪使得能够立即测量其强度随时间快速变化的气体种类的质谱，并且估计当气体被引入到质谱仪中时在时间零处的每种气体种类的绝对丰度。在高可靠性的Ar-Ar定年中，需要对多个增量加热气体组分进行年龄谱测定，这就要求减少每个组分的分析时间。这种新型质谱仪可以在将气体引入质谱仪之前评估气体净化时间。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