Which of the following effects radiation only on the individual exposed?

The somatic effect of radiation refers to the biological effects that occur within the individual who has been exposed to radiation. These effects manifest in the exposed person and can include a range of health issues such as skin burns, radiation sickness, and an increased risk of cancer, among other conditions. Somatic effects are localized to the individual, meaning that they do not affect future generations or individuals that are not directly exposed to the radiation.

In contrast, genetic effects are those that can be passed on to future generations, impacting offspring of the exposed individual rather than the individual themselves. Environmental effects refer to the consequences of radiation release into the environment, affecting ecosystems and potentially all life forms within that system. Acute effects involve immediate reactions to high doses of radiation and can encompass both somatic effects and other health impacts, but they do not specifically isolate to the effects on the individual alone.

Thus, the uniqueness of somatic effects lies in their direct impact on the person who was exposed, making it the correct choice in this context.