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A moderating geometry providing a constant thermal neutron flux from two radiumberyllium (a,n ) sources has been constructed. The flux at the center of the geometry has been calibrated by absolute alpha counting from boron films exposed in pulse ionization chambers. The boron capture cross section has been obtained by comparison of the NBS boron with the Argonne "s tandard" boron , and a value of nv = 3918 ( ± 2 percent) n / cm2 sec has been determined for the flux .

Absolute calibration of the NBS standard thermal neutron density