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Bleaching of blue light stimulated luminescence of quartz by moonlight
Journal of Earth System Science ( IF 1.9 ) Pub Date : 2020-10-15 , DOI: 10.1007/s12040-020-01474-1
H M Rajapara , Vinayak Kumar , Naveen Chauhan , P N Gajjar , A K Singhvi

Abstract

Moonlight is sunlight reflected from the moon’s surface. It is additionally modulated by the Earth’s atmosphere, dust and pollutants on its way to the surface of the Earth. This contribution reports the bleaching rates of blue light stimulated luminescence (BLSL) signal of Quartz under full moonlight exposure at the Earth’s surface. Quartz BLSL reduced to 70% by an exposure of 5 hrs moonlight, is in contrast to ~90% reduction in < 3 s with daylight. This was anticipated due to (a) reduced moonlight flux by about a factor of half a million (Agrawal in Lat. Am. J. Phys. Educ. 4(2):325–328, 2010; J. Phys. Astron. 5(1):1–15, 2017); (b) inverse power law dependence of bleaching efficiency on wavelength (Spooner in The validity of optical dating based on feldspar, Ph.D. Thesis, Oxford University, Oxford, 1993; Chen and McKeever in Theory of Thermoluminescence and related phenomena, World Scientific Publications, London, 1997, Chen and Pagonis in Thermally and optically stimulated luminescence: A simulation approach, Wiley and Sons, Chichester, 2011); and (c) moonlight and daylight have spectral peaks around 650 and 550 nm, respectively. Deconvolution of OSL components suggests that moonlight affects the fast component of OSL signal the most. This has ramification for the application in polar regions, where the availability of daylight is at a premium during the winter months. Within a given context, it is conjectured that this could be used to infer the seasonality of sediment transport.

Research highlights

  1. 1.

    Up to 40% reduction of quartz luminescence signal observed over long moonlight exposure.

  2. 2.

    Moonlight can bleach up to 70% of the fast component of blue light stimulated luminescence signal.

  3. 3.

    Moonlight bleaching may hamper the accuracy of ages of sediments which are only transported during night.

  4. 4.

    Seasonality of sediment deposition can be studied using the bleaching effect of moonlight on quartz.



中文翻译:

蓝光的漂白通过月光刺激了石英的发光

摘要

月光是从月球表面反射的阳光。此外,它在到达地球表面的过程中还受到地球大气层,灰尘和污染物的调节。该贡献报告了在地球表面满月光照射下,石英的蓝光激发发光(BLSL)信号的漂白率。通过在5小时的月光下曝光,石英BLSL降低至70%,而在日光下,<3 s降低约90%。可以预见,这是由于(a)月光通量减少了约百万分之一(Agrawal,位于Lat。Am。J. Phys。Educ。4(2):325-328,2010; J。Phys。Astron。5 (1):2017年1月15日);(b)漂白效率对波长的逆幂​​定律依赖性(Spooner在基于长石的光学测年的有效性中,牛津大学牛津大学博士学位论文,1993年; Chen和McKeever的《热致发光理论及相关现象》,世界科学出版物,伦敦,1997年; Chen和Pagonis的《热和光学激发的发光:一种模拟方法》,Wiley and Sons,Chichester,2011年)。(c)月光和日光分别在650和550 nm附近具有光谱峰值。OSL分量的反卷积表明,月光对OSL信号的快速分量影响最大。这对于极地地区的应用有很大的影响,在极地地区,冬季的日光利用率非常高。在给定的背景下,推测可以用来推断沉积物运输的季节性。Wiley and Sons,奇切斯特,2011年);(c)月光和日光分别在650和550 nm附近具有光谱峰值。OSL分量的反卷积表明,月光对OSL信号的快速分量影响最大。这对于极地地区的应用有很大的影响,在极地地区,冬季的日光利用率非常高。在给定的背景下,可以推测这可以用来推断沉积物运输的季节性。Wiley and Sons,奇切斯特,2011年);(c)月光和日光分别在650和550 nm附近具有光谱峰值。OSL分量的反卷积表明,月光对OSL信号的快速分量影响最大。这对于极地地区的应用有很大的影响,在极地地区,冬季的日光利用率非常高。在给定的背景下,推测可以用来推断沉积物运输的季节性。

研究重点

  1. 1。

    在长时间的月光照射下观察到的石英发光信号最多降低40%。

  2. 2。

    月光最多可以漂白蓝光激发的发光信号的快速成分的70%。

  3. 3。

    月光漂白可能会影响仅在夜间运输的沉积物的年龄准确性。

  4. 4。

    可以使用月光对石英的漂白作用来研究沉积物沉积的季节性。

更新日期:2020-10-16
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