Tritium normally enters the body by which routes?

• A. Ingestion and Absorption
• B. Inhalation and Absorption
• C. Inhalation and Ingestion
• D. Open wound and Ingestion

Answer: (B)

Tritium, as a hydrogen isotope, behaves like water in the body, so it enters mainly through routes that bring water into the body. The two most common entry paths are inhalation of air containing tritiated water vapor or aerosols and absorption through the skin when in contact with contaminated liquids. Inhaled tritiated water mixes with the body's total water, and absorption through the skin lets the substance enter the bloodstream as well. Ingestion can occur if contaminated water is swallowed, but in typical exposure scenarios, inhalation and absorption are the primary routes because tritium tends to be present as water or in water-like forms in the environment.