T.D. Luckey is known for writing science fiction and fantasy novels, including the "Shifter's End" series. Luckey's works often feature intricate world-building and diverse characters, appealing to fans of the genre.

Simple answer, no one knows. Regulatory authorities assume that radiation doses follow a linear plot based on cases of high dose exposure alone, and do extrapolate down to zero, because there is little to no information of effects of low doses, and they have to assume something (they cannot simply ignore low doses, so they assume the worst).

Currently, all knowledge of radiation and it's effects comes from relatively high doses, i.e. from accidents like Chernobyl, since you can't actually experiment to see what happens, and low dose effects are very long term and any conditions the do later develop cannot be specifically assigned to low dose radiation exposure conclusively.

However, there is some study on a principle called radiation hormesis that suggests that low doses in addition to the natural background are actually beneficial.

Radiation is a natural part of our environment.

In fact, everyone has a small percentage of radioactive hydrogen and radioactive carbon in their bodies, and the air you breathe has a small amount of radioactive radon gas in it. You also receive some radiation from the sun.

So a little radioactivity (often termed as background radiation) is normal.

X-rays, fluoroscopy, and CT scans give a person small doses of radiation, but usually it is believed that the benefits outweigh the risks.

Radioactive decays can damage genes. However, the cells in your body have complex mechanisms to repair damaged genes. Unfortunately, not all damaged genes and gene transcription errors are fixed, and these errors can lead to cancer.

Ironically while radiation can cause cancer, it is also a common treatment for cancer due to its ability to kill rapidly dividing cells.

There are multiple theories about small does of radiation. Some theories suggest that any amount of radiation is harmful and increases cancer risk. However, there are many studies about an effect called hormesis in which low doses of radiation actually activate the immune system and have a beneficial effect.

High doses of radiation, however, can be very damaging and can be lethal. See the wikipedia article on radiation linked below. An acute dose of 300 to 400 REM is considered 50% lethal. An acute dose of over 1000 REM is considered 100% lethal. However, the radiation poisoning and death can occur over several days post-exposure.

Yes, alpha radiation is an ionizing radiation.

Yes, but there are a number of radiation besides ionizing radiation.