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➤ It is used in radiography for relevant studies and in tomography, where it is part of ultra-sensitive scintillation detectors of ionizing radiation.

➤ The practical significance in the area of tomography is the production of medical radionuclides.

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➤ Leads to infertility and purulent otitis media, causes Parkinson's disease.

➤ Antidote: Symptomatic therapy.

➤ The metallic protactinium was isolated by the American radiochemist A. Gross in 1934 from its oxide Pa₂O₅.

➤ In air, Pa is protected by an oxide film.

➤ Pa compounds are adsorbed by the walls of glass chemical vessels.

➤ Pa₂O₅ is the most stable and best-studied Pa compound.

➤ The compounds of Pa⁺³ are unknown.

➤ The toxicity of Pa is 250 times higher than that of hydrocyanic acid.

➤ Protactinium-231 protons can be used to produce the uranium-232 isotope.