Target core for producing < 99 > Mo by heavy water reactor, production element and production assembly

The invention discloses a target core for producing < 99 > Mo by a heavy water reactor, which comprises a target tube, a target material layer and a neutron absorber material, the target tube is sleeved with the target material layer, two ends of the target tube are respectively connected with an inner end plug, and the neutron absorber material is arranged in the target tube. A target core production element for producing < 99 > Mo through a heavy water reactor comprises a target core, a cladding tube, an isolation block, a supporting block and outer end plugs, the target core is arranged in the tubular cladding tube, the outer end plugs are welded to the two ends of the cladding tube to seal the cladding tube, and the isolation block and/or the supporting block are/is welded to the outer portion of the cladding tube. The production assembly comprises a production element and end plates, and the end plates are connected with the two ends of the production element in a welded mode. The method has the benefici