Radiobiological effects that first appear minutes, days or weeks after exposure are termed?

• A. Lag dependent
• B. Post-latent
• C. Short term
• D. Long-term

Answer: (C)

When we look at how radiobiological effects show up after exposure, timing is the key. Effects that appear within minutes to weeks after exposure are considered short-term effects. These are the early tissue and cellular responses that occur soon after the radiation dose, such as immediate cell injury or rapid functional changes. Long-term effects, in contrast, take months to years to become evident, like fibrosis or carcinogenesis, and latent-period concepts describe delays before signs appear but don’t define these immediate-onset reactions. The term lag dependent isn’t a standard way to label this early timing, and post-latent would imply after a latent phase, not the immediate-onset group. So the best fit for effects first appearing in minutes, days, or weeks is short-term.