MRI: Acquisition of a Canberra Broad Energy Germanium Detector BE3830 Gamma Spectroscopy System

1428025 keen - zebert这项主要研究仪器（MRI）计划拨款为购买基于Ge探测器的伽马射线光谱系统提供部分支持，该系统将支持完整的校园光学刺激和热释光地质年代学能力。伽马射线能谱仪将用于评估要测定年代的矿物阶段所经历的年辐射剂量率，这些阶段是矿物中所含核素放射性衰变的结果。该设备将允许内华达大学沙漠研究所（DRI）的全部能力来确定矿物相的埋藏时间，因为最后一次暴露在阳光下或超过300摄氏度的温度下，应用于第四纪地球科学和考古调查。该设备建立在已经安置在DRI的OSL/TL阅读器基础设施上，可以测量等效剂量，或者由于矿物中痕量核素的放射性活性衰变而在晶格缺陷中积累的能量，这些能量与上次暴露在阳光或高温下的时间长度成正比，从而释放出晶格捕获的能量。OSL/TL日期是根据当量剂量与剂量率之比计算的。DRI的OSL和TL测年能力将支持从湿润的中部大陆到北美大盆地、印度和新西兰山区以及南非内陆河流系统等一系列环境中河流和风成景观的景观演变和过程地貌学的基础研究。该设施将为外部用户及其学生提供服务，PI积极参与当地K-12的外展活动，向学生传授自然发生的放射性及其有用的应用

1428025Keen-ZebertThis Major Research Instrumentation (MRI) Program grant provides partial support for the acquisition of a Ge detector based gamma ray spectroscopy system that will support the full on-campus capability for optically stimulated and thermoluminescence geochronology. The gamma ray spectrometer will be used to assess the annual dose rate of radiation experienced by mineral phases to be dated that are resultant of radioactive decay of nuclides contained within the minerals. The equipment will allow for the complete capacity at the University of Nevada Desert Research Institute (DRI) to ascertain the burial time of mineral phases since last exposure to sunlight or temperatures in excess of 300 degrees C with application to Quaternary geoscience and archaeological investigations. The equipment builds on the OSL/TL reader infrastructure already housed at DRI which allows for measurement of equivalent dose, or the energy accumulated in crystal lattice defects as a result of radioactive active decay of trace nuclides in the mineral that are proportional to the length of time since last exposure to sunlight or high temperatures, which releases this crystal lattice trapped energy. OSL/TL dates are calculated based on the ratio of equivalent dose to dose rate.OSL and TL dating capabilities at DRI will support fundamental research on landscape evolution and process geomorphology in both fluvial and aeolian landscapes over a range of environments from the humid mid-continent to the Great Basin of North America, mountainous regions of India and New Zealand, and river systems in the interior of South Africa. The facility will serve outside users and their students and the PI is actively engaged in local K-12 outreach activities that teaches students about natural occurring radioactivity and its useful applications.***