Beryllium has a very low neutron capture cross-section(0.009barns), high melting point (about 1300oC)and good strength, and at one time it seemed possible that it would find an application either as the moderator or the fuel cladding in thermal reactors.铍有极低的中子俘获截面、高熔点和良好的 强度,曾一度好像可能成为热堆慢化剂或者燃料包壳。 However, it and its compounds are toxic, and beryllium itself has low ductility(延展性) and poor corrosion resistance(抗腐蚀性).但是,其化合物 具有毒性,并且铍本身的延展性比较低,抗腐蚀性也比较差。 Beryllium oxide Beo also has undesirable properties As a result of this neither bery ilium nor its oxide have found any use in power reactor, and it is unlikely that they will be used in the future. tAAR 镀及其氧化物都无法在动力堆中使用,而且将来也不会派上用场。 The choice of moderators for thermal reactors is thus limited to three materials-water, heavy water and carbon in the form of graphite.热堆的慢 化剂的选择范围被局限在三种材料一水、重水和石墨状态的碳。Beryllium has a very low neutron capture cross-section (0.009barns), high melting point (about 1300oC) and good strength, and at one time it seemed possible that it would find an application either as the moderator or the fuel cladding in thermal reactors. 铍有极低的中子俘获截面、高熔点和良好的 强度，曾一度好像可能成为热堆慢化剂或者燃料包壳。 However, it and its compounds are toxic, and beryllium itself has low ductility (延展性) and poor corrosion resistance (抗腐蚀性). 但是，其化合物 具有毒性，并且铍本身的延展性比较低，抗腐蚀性也比较差。 Beryllium oxide BeO also has undesirable properties. As a result of this neither beryllium nor its oxide have found any use in power reactor, and it is unlikely that they will be used in the future. 结果， 铍及其氧化物都无法在动力堆中使用，而且将来也不会派上用场。 The choice of moderators for thermal reactors is thus limited to three materials-water, heavy water and carbon in the form of graphite. 热堆的慢 化剂的选择范围被局限在三种材料－水、重水和石墨状态的碳