Radioactive Processes Involving Hydrogen

All cases of radioactive decay involve the atom s nucleus. Since these processes do not involve the atom s electrons, they occur regardless of the chemical environment of the nucleus. For example, radioactive hydrogen-3, or tritium, will decay by (1 particle emission whether it is contained in a water molecule or hydrogen gas, or in a complex protein. 

Radioiodination involves the substitution of radioactive iodine atoms for reactive hydrogen sites in target molecules. The process usually involves the action of a strong oxidizing agent to transform iodide ions into a highly reactive electrophilic iodine II compound (typically I2 or a mixed halogen species such as IC1). Formation of this electrophilic species leads to the potential for rapid iodination of aromatic compounds... 

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