The skin dose measured at the anterior chest during radiography is most indicative of which organ dose?

• A. Thyroid dose
• B. Probability of cataracts
• C. Breast dose
• D. Depression of lymphocytes

Answer: (C)

The main idea is that a skin dose meter placed on the anterior chest directly reflects the dose that tissues just under that surface receive. In chest radiography, breast tissue sits immediately behind the chest wall, so the skin entrance dose closely tracks the dose deposited in the breast glandular tissue. This makes the anterior chest skin dose the best indicator of breast dose.

The thyroid sits higher up in the neck, not directly beneath the anterior chest skin. The lens of the eye would require exposure to the head region, which isn’t the area being irradiated in a chest study. Depression of lymphocytes relates to systemic or bone marrow exposure rather than a local superficial tissue dose, so it isn’t well indicated by a chest skin dose measurement.