Most somatic effects occur:

• A. At doses used during diagnostic radiography
• B. Beyond diagnostic radiography
• C. In old age
• D. In middle age

Answer: (B)

Somatic effects from radiation are typically deterministic, meaning they have a dose threshold and become more likely and more severe as the dose increases. The doses used in diagnostic radiography are very small, far below the levels needed to trigger these tissue reactions. That’s why most somatic effects don’t occur with standard X-ray exams. Only when the exposure is well beyond diagnostic levels—such as in high-dose radiotherapy, large accidental exposures, or occupational overload—do you start to see noticeable somatic damage like skin changes, hair loss, radiation sickness, or organ/tissue injury. Age isn’t the main factor shaping this likelihood; it’s the amount of radiation dose. Stochastic risks like cancer can still be influenced by dose at diagnostic levels, but the question about somatic (deterministic) effects centers on dose thresholds, which is why the correct idea is that most such effects occur beyond diagnostic radiography.