Leah B explains ionizing radiation and its impact on veterans seeking VA disability benefits. She describes ionizing radiation as a powerful form of energy that can damage cells and DNA, potentially leading to serious health conditions like cancer. Leah highlights the VA's presumptive criteria for disabilities caused by radiation exposure, including specific locations, timeframes, and radiogenic diseases such as leukemia, thyroid cancer, and more. She provides guidance on navigating VA resources, understanding eligibility requirements, and seeking assistance from veteran service officers or legal professionals. The video emphasizes the importance of reviewing available materials and sharing experiences to better support veterans navigating these claims.