Which hazard is not commonly associated with high levels of radiation exposure?

High levels of radiation exposure can lead to a variety of health hazards, including acute radiation syndrome, severe burns, and increased mortality risk. Each of these conditions is a serious consequence of significant exposure to radiation, impacting the body’s cells and overall health.

Acute radiation syndrome is a direct result of receiving a large dose of radiation in a short time frame and can cause symptoms such as nausea, vomiting, and internal damage. Severe burns can also occur as a result of high radiation levels, inflicting damage on skin tissue and resulting in painful injuries.

In contrast, an improved immune system is not a recognized hazard or effect associated with high radiation exposure. In fact, radiation exposure typically suppresses the immune system, reducing its effectiveness and increasing susceptibility to infections and diseases. Thus, this option stands out as the one that does not align with the known consequences of high radiation levels.