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ASTM C1233-09

Historical Revision

Standard Practice for Determining Equivalent Boron Contents of Nuclear Materials

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1.1 This standard details a recommended practice for the calculation of the Equivalent Boron Content (EBC) for nuclear materials. The EBC is used to provide a measure of the macroscopic neutron absorption cross section of a nuclear material. EBC factors for the natural elements are determined from their atomic their masses and thermal neutron absorption cross sections. This practice is illustrated by using EBC factors that are based on thermal neutron (2200 m/s) absorption cross sections. Other EBC factors may be used depending upon the actual neutron energy spectrum.

1.2 The EBC is a characteristic of a homogeneous material. Characterization of inhomogeneous materials and calculation of neutron multiplication factors require techniques that are beyond the scope of this practice.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.


This practice details the recommended method for calculating the equivalent boron content (EBC) values of nuclear elements and materials that are of potential significance as thermal neutron poisons. EBC factors are determined from the atomic weight of elements and the thermal neutron absorption cross section in barns. These may be used depending upon the actual neutron energy characteristics of the applicable reactor system. The elements aluminum, fluorine, rubidium, barium, lead, silicon, beryllium, neon, tin, bismuth, oxygen, zirconium, carbon, magnesium, cerium, and phosphorus are not required to be included in the EBC calculations as their contribution to the total poison effect is not considerably significant.


SDO ASTM: ASTM International
Document Number C1233
Publication Date June 1, 2009
Language en - English
Page Count 3
Revision Level 09
Supercedes
Committee C26.02
Publish Date Document Id Type View
June 1, 2015 C1233-15 Revision
June 1, 2009 C1233-09 Revision
July 10, 2003 C1233-03 Revision
Aug. 10, 1998 C1233-98 Revision
Oct. 1, 2021 C1233-15R21 Reaffirmation