The HZE ion refers to a type of heavy ion that consists of nuclei of hydrogen (which typically includes protons) and higher mass elements, such as helium and heavier ions. The term "HZE" stands for "high atomic number and energy" ions, which are a particular concern in the context of space radiation. In space, cosmic rays consist of high-energy particles, including protons (H) as well as heavier nuclei (like He, C, O, Fe, etc.).
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