Therefore , all primordial curium , that is curium present on the Earth during its formation , should have decayed by now . Curium is produced artificially , in small quantities for research purposes .
Curium has to be made .
Curium has to be made .
이해하기 쉽게 해주세요: Therefore , all primordial curium , that is curium present on the Earth during its formation , should have decayed by now . Curium is produced artificially , in small quantities for research purposes . 산출: