Many ways how Radiation is harmful.
Radiation is harmful to humans in many ways ill make a short list of them
Radiation can cause radiation burns, Cancer, genetic mutations because your body tissue gets damaged with iodizing radiation and in turn your cells can’t repair themselves and when or if they do they are cancerous.
The harmful elements in radiation gets into your body differently like radioactive iodine gets into your body naturally by your thyroid so thats why there are iodine pills so you won’t absorb the irradiated iodine. Caesium gets into your body by going through your food just like strontium…. but they last in your body differently like iodine last 8 days in your body, caesium 20 days and strontium 29 years in your body.
It passes on mutations into your offspring.
This is all i have for information i have gathered and put into my own words.