Neptunium he yit-chúng fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì Np, ngièn-chṳ́ su-muk he 93.
↑Sanchez, Rene G.; Loaiza, David J.; Kimpland, Robert H.; Hayes, David K.; Cappiello, Charlene C.; Myers, William L.; Jaegers, Peter J.; Clement, Steven D.; Butterfield, Kenneth B. "Criticality of a 237Np Sphere"(PDF). Japanese Atomic Energy Agency. 2014-08-06 chhà-khon.