We are surrounded by this radiation all the time. Small radiation comes from the surface of soil, rocks, the air, water, plants, building materials, and food. Some radiation is caused by the cosmic rays from outer space. However, our body can withstand low-level radiation without ill effects because it is able to repair any damage. But long term exposure can be very dangerous.There are several disadvantages of radioactive radiation: A high dosage of radioactive radiation on the body might lead to death. Radioactive isotopes are very expensive. Small doses of radiation for a prolonged time can cause the cells to multiply. A large dose of radiation will cause death.