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Thoriated glass
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Thoriated glass : ウィキペディア英語版
Thoriated glass
Thoriated glass is a glass material used in the manufacture of optical systems, specifically photographic lenses. It is useful to this process due to its high refractive index. Thoriated glass is radioactive due to the inclusion of thorium dioxide, oxide of radioactive element thorium. It is therefore been succeeded as a material of choice by glass including lanthanum oxide. Thoriated glass can contain up to 30% by weight of thorium.〔http://www.irpa.net/irpa3/cdrom/VOL.3B/W3B_13.PDF Robert C. McMillan & Steven A. Horne: ''Eye Exposure from Thoriated Optical Glass'' (U.S. Army memo)〕 The thoriated glass elements in lens over time develop a yellow tint reducing transmission and interfering with neutral color reproduction.
== References ==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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