EFFECT OF IRON ON THE DETERMINATION OF MOISTURE CONTENT BY THE NEUTRON METHOD

THE METHOD OF DETERMINING MOISTURE CONTENT BY MEASURING THE MODERATION OF HIGH ENERGY NEUTRONS SCATTERED INTO A SOLID MEDIA IS A PROMISING ONE. THE RAPIDITY WITH WHICH MEASUREMENTS CAN BE MADE, AND THE OBVIATION OF DESTRUCTIVE SAMPLING ARE PRIME ADVANTAGES OF THIS TECHNIQUE. UNDER CONTROLLED CONDITIONS, WHERE THE UNIFORMITY OF MANUFACTURED TEST SPECIMENS IS MAINTAINED WITHIN NARROW LIMITS, IT PROVIDES ACCURATE RESULTS, BUT WHEN APPLIED TO MATERIALS IN THE NATURAL STATE, UNKNOWN CONDITIONS AND CONSTITUENTS MAY SIGNIFICANTLY AFFECT THE PRECISION OF THE METHOD. THE PHYSICAL PRINCIPLE UPON WHICH THIS TECHNIQUE IS BASED IS SIMPLE. HIGH-ENERGY NEUTRONS ARE SCATTERED INTO A TEST MEDIUM AND THEY COLLIDE WITH THE ATOMS OF THE MEDIUM IN THE VICINITY OF THE SOURCE. BECAUSE THE MASSES OF HYDROGEN ATOMS AND NEUTRONS ARE APPROXIMATELY THE SAME, AND THOSE OF OTHER ELEMENTS LIKELY TO BE PRESENT SEVERAL TIMES GREATER, THE NEUTRONS LOSE KINETIC ENERGY IN A MANNER THAT IS ESSENTIALLY PROPORTIONAL TO THE QUANTITY OF HYDROGEN ATOMS WITHIN A GIVEN VOLUME. A DETECTOR OF THERMAL NEUTRONS INDIRECTLY MEASURES THE LOSS OF KINETIC ENERGY. BY ASSUMING THAT ALL HYDROGEN ATOMS IN THE TEST MEDIUM ARE CHEMICALLY ASSOCIATED WITH OXYGEN ATOMS IN THE FORM OF WATER, THE TECHNIQUE BECOMES A METHOD OF MEASURING MOISTURE CONTENT. /AUTHOR/

  • Corporate Authors:

    N/A

    ,   United States 
  • Authors:
    • Burn, K N
  • Publication Date: 0

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  • English

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  • Accession Number: 00228861
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 15 2004 2:34AM