标题： 薄层ThF4的光致发光和辐射发光测量 显示英文标题

标题： Measurement of photo- and radio-luminescence of thin ThF4 films

摘要： 我们在薄层ThF$_4$薄膜的紫外和可见光范围内的光致发光和辐射发光进行了测量。 在紫外范围内，我们发现两种发光强度与光电倍增管（PMT）的内部暗计数噪声处于相似水平。 我们的结果表明，薄层ThF$_4$晶体可以作为寻找$^{229m}$钍的目标以及未来核钟的介质。 测量结果表明，使用小而薄的ThF$_4$薄膜可以在保持信号水平不变的情况下减少背景噪声，这是通过增加$^{229}$钍的富集度实现的。 我们开发的装置现在已经准备好对ThF$_4$中的$^{229m}$钍激发和衰变进行直接测量。 显示英文摘要

摘要： We conducted measurements on the photo- and radio-luminescence of thin ThF$_4$ films in both the UV and visible ranges. In the UV range, we found that both luminescences are at a similar level as the internal dark counting noise of the photo-multiplier-tube (PMT). Our results suggest that thin ThF$_4$ crystals could be used as a target for the search for $^{229m}$Th and as a medium for the future nuclear clock. The measurements indicate that using a small and thin ThF$_4$ film can reduce background noise while maintaining the signal at the same level, achieved by increasing the $^{229}$Th enrichment. Our developed apparatus is now ready for direct measurements of $^{229m}$Th excitation and decay in ThF$_4$.