What does the concept of collective dose represent?

• A. The maximum dose to any single individual.
• B. The rate of dose accumulation in a year.
• C. The sum of individual doses across a population.
• D. The average dose per person.

Answer: (C)

The main idea is that collective dose represents the total radiation burden to a population over a defined group and time period by summing each individual’s dose. In practice, you add up every person’s effective dose, which is equivalent to the number of people times the average dose for that group. The unit is person-Sievert, reflecting both how many people are exposed and how much dose each person receives. This measure is useful for comparing overall societal impact of different practices or scenarios and for planning radiation protection efforts. It does not describe the dose to any single person, nor is it a rate unless you specify a time interval; it’s the total, not the per-year rate. It’s also not simply the average dose per person, since the average loses information about the total burden across the population.