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ASTM C1233-03

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) values for elements that are of potential significance as thermal neutron poisons. The values are determined from a knowledge of the atomic weight of elements and the thermal neutron absorption cross section in barns. This practice is illustrated by using the EBC factors of Table 1 which are based on thermal neutron (2200 m/s) absorption cross sections. Other EBC factors may be used depending upon the actual neutron energy characteristics of the applicable reactor system.

1.2 The following elements do not require to be included in the EBC calculations, as their EBC factors are less than or equal to 0.0001: aluminum; fluorine; rubidium; barium; lead; silicon; beryllium; neon; tin; bismuth; oxygen; zirconium; carbon; magnesium; cerium; phosphorus. Their contribution to the total poison effect is not considered significant.


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 July 10, 2003
Language en - English
Page Count 3
Revision Level 03
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