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foot fairy | 16:43 Sat 23rd Jan 2010 | Quizzes & Puzzles
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52 across, Field which studies EMR including visible light, x rays, gamma rays and ultra violet. I have R?D?O?E?R? Have I gone wrong somewhere, because I can't get anything to fit. Any help would be appreciated.
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radiometry
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Thank you so much roslyn.

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