
<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Dingle, Cheri Anne M.</style></author><author><style face="normal" font="default" size="100%">Jecong, Julius Federico M.</style></author><author><style face="normal" font="default" size="100%">Hila, Frederick C.</style></author><author><style face="normal" font="default" size="100%">Ramo, Ma. Elina Salvacion V.</style></author><author><style face="normal" font="default" size="100%">Guillermo, Neil Raymund D.</style></author><author><style face="normal" font="default" size="100%">Vasquez Jr, Magdaleno R.</style></author><author><style face="normal" font="default" size="100%">Samson, Vallerie Ann I.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Determination of the REE content, geological age, and absorbed alpha dose of allanite mineral from Palawan, Philippines</style></title><secondary-title><style face="normal" font="default" size="100%">X-Ray Spectrometry</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2019</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://onlinelibrary.wiley.com/doi/abs/10.1002/xrs.3029</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">48</style></volume><pages><style face="normal" font="default" size="100%">513-521</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Allanite is a common accessory mineral in igneous rocks that contains significant amounts of rare-earth elements (REEs), thorium (Th), and uranium (U). The presence of Th and U in the allanite exposes it to radiation resulting in radiation damage in its crystal structure and further leads to metamictization. Hence, allanite can be used as a natural analogue to assess the long-term radiation effects in materials for high-level nuclear waste disposal. It provides information on the effect of α-decay on the crystal structure including the stability and integrity of the material. In this study, the absorbed α-dose of allanite from Ombo, Palawan, Philippines, was estimated from the Th and U content and geological age of the mineral using X-ray fluorescence and gamma-ray spectrometry. The amount of Th and REE was measured to be around 1.37 and  30.4 wt.%, respectively. Radiometric dating using gamma-ray spectrometry estimated the age of the allanite mineral to be around 24–35 million years. Having obtained the amount of radioactivity and the time of exposure, the corresponding absorbed α-dose was estimated to be at 2.84 × 1014 α-decays/mg. Results suggest that the allanite mineral studied has not accumulated significant radiation damage to cause amorphization and still exhibit a crystalline structure. This study may provide data on the properties of allanite or silicate matrices as part of the ongoing studies on silicate minerals as natural analogues.</style></abstract><issue><style face="normal" font="default" size="100%">5</style></issue></record></records></xml>