Fission product getter

A method of forming a getter element comprising:

• determining an expected amount of fission product contained within a fluid flow of a nuclear fission reactor core over a selected period of time of operation of the nuclear fission reactor;
• identifying an expected amount of reaction product to be formed in a chemical reaction between the expected amount of the fission product and a getter material, the chemical reaction occurring over the selected period of time of operation of the nuclear fission reactor;
• determining a volume parameter of a getter process mixture including the getter material and based on the expected amount of the fission product and the expected amount of reaction product;
• and
• mixing the getter material and a plurality of void-forming structures to form the getter process mixture;
• and
• removing the plurality of void-forming structures from the getter process mixture to form a getter body with a void structure, the void structure based at least in part on the volume parameter and forming at least one through-channel through the getter body.