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Biological properties -
1. Radionuclides cannot be destroyed or degraded, unlike organic substances as such -
a. Because radionuclides cannot be destroyed, disposal of residual radioactive wastes are usually very technical and limited. The waste forms must meet disposal site waste acceptance criteria.
b. The storage is also a problem
2. They are able to be put into the body easily (injection, inhalation, ingestion)
3. They have mimic behaviour of biological material, as such they are able to be 'stuck to' a biological material for a specific test (labelling)
4. They have short physical half-life, thereby decay quickly. But long enough to be produced and delivered to the exam site
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