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X-ray fluorescence. XRF scanning of the Rembrandt -painting Syndics of the Drapers' Guild. A handheld XRF analyzer gun. X-ray fluorescence ( XRF) is the emission of characteristic "secondary" (or fluorescent) X-rays from a material that has been excited by being bombarded with high-energy X-rays or gamma rays.
Smallpox was an infectious disease caused by variola virus (often called smallpox virus), which belongs to the genus Orthopoxvirus. [7] [11] The last naturally occurring case was diagnosed in October 1977, and the World Health Organization (WHO) certified the global eradication of the disease in 1980, [10] making smallpox the only human disease ...
X-ray crystallography is the experimental science of determining the atomic and molecular structure of a crystal, in which the crystalline structure causes a beam of incident X-rays to diffract in specific directions. By measuring the angles and intensities of the X-ray diffraction, a crystallographer can produce a three-dimensional picture of ...
Borax (also referred to as sodium borate, tincal (/ ˈ t ɪ ŋ k əl /) and tincar (/ ˈ t ɪ ŋ k ər /)) is a salt (ionic compound), a hydrated or anhydrous borate of sodium, with the chemical formula Na 2 H 20 B 4 O 17 (also written as Na 2 B 4 O 7 ·10H 2 O). It is a colorless crystalline solid that dissolves in water to make a basic solution.
Walter Ray Williams Jr. (born October 6, 1959) is an American professional bowler and competitive horseshoes pitcher. He currently holds the record for all-time standard PBA Tour career titles (47), and total PBA earnings (over $5 million through 2022). [2] He is a seven-time PBA Player of the Year (tied with Jason Belmonte for the most all ...
Abol tabol ( Bengali: আবোল তাবোল; listen ⓘ; lit. 'The Weird and the Absurd') is a collection of Bengali children's poems and rhymes composed by Sukumar Ray, first published on 19 September 1923 by U. Ray and Sons publishers. It consists of 46 titled and seven untitled short rhymes (quatrains), all considered to be in the ...