| http://www.w3.org/ns/prov#value | - However, the phosphorescence still hasa fairly high intensity even when the light used for excitation is a steady light such as of an ultra-high pressure 500W Hg lamp.When the time lag of phosphorescence is measured by use of an ultra-high pressure 500W Hg lamp, it is found that the time lag varies with the particular kind of polymer medium in use.
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