Final answer:
Most other forms of radiation-induced cancers, excluding leukemia, typically have the longest latency period, extending to about 15 years before onset.
Step-by-step explanation:
Among the radiation-induced conditions mentioned, leukemia has the shortest latent period of approximately 2 years. In comparison, most other forms of radiation-induced cancers have a latent period of about 15 years, and those affected remain at risk for at least 30 more years after that.
Temporary infertility and erythema are generally not associated with such long latent periods, as they tend to be more immediate or short-term in their effects following radiation exposure. Acute radiation lethality is also a short-term effect occurring shortly after exposure to a high dose of radiation. Therefore, most forms of cancer, other than leukemia, are most likely to have the longest latent period.