A practical method for measuring the boron equivalent of graphite impurity

A question of graphite purity testing is discussed in the context of the Nuclear Non Proliferation Treaty. A practical method for measuring the boron equivalent of graphite impurity via comparing the thermal neutron absorption in standard and test graphite samples is described. An experimental assem...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2005-08, Vol.237 (3), p.602-612
Main Authors: Bolewski, A., Ciechanowski, M., Dydejczyk, A., Kreft, A.
Format: Article
Language:English
Subjects:
252Cf neutron source
Boron equivalent
Graphite
MCNP
Sensitivity
Thermal neutron absorption
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Summary:A question of graphite purity testing is discussed in the context of the Nuclear Non Proliferation Treaty. A practical method for measuring the boron equivalent of graphite impurity via comparing the thermal neutron absorption in standard and test graphite samples is described. An experimental assembly comprising 252Cf neutron source is presented. With the use of 300-cm 3 ground graphite sample, the value of boron equivalent can be determined to the precision of 0.74 ppm. MCNP simulations showed that the uncertainty of BE determination could be reduced significantly if a larger sample was used.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2005.03.002