ASTM E2971-14

1.1 This test method is intended for quantitative determination of effective boron-10 (¹⁰B) areal density (mass per area of ¹⁰B, usually measured in grams-¹⁰B/cm² ) in aluminum neutron absorbers. The attenuation of a thermal neutron beam transmitted through an aluminum neutron absorber is compared to attenuation values for calibration standards allowing determination of the effective ¹⁰B areal density. This test is typically performed in a laboratory setting. This method is valid only under the following conditions: