The gamma rayindex is usually computed from a well log such as a gamma ray log.
自然伽马指数通常由自然伽马或其它测井曲线计算得到。
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The paper provides easy-to-understand daily life indexes such as the ultraviolet rayindex, morning exercise index, sun protection factor index, carwash and heat stroke indexes.
Dr Hess envisages a ray of light travelling down an optical fibre made from two materials: a core with a negative refractive index and an outer sheath with a positive one.