The magnitude 9.0 Great East Japan Earthquake occurred on March 11, 2011, claiming over 20,000 lives. It crippled the Fukushima Daiichi Nuclear Power Plant, whose hydrogen-air explosions contaminated wide areas around Fukushima with radionuclides. The number of evacuees initially totaled 328,903, but has been reduced to 263,392 as of February 13, 2014. More than half of the evacuees (132,500) consist of Fukushima residents, and 67% of whom have experienced mental or physical disorders. Indeed, refugee life is so difficult that many Fukushima families have been affected by suicide, divorce, separation of family members, migration and settlement to other places, mental illness, etc. The difficulty is caused by the fear of low-dose radiation induced by the LNT model which claims that radiation cancer risk is linearly proportional to dose without any threshold. Careful scrutiny of the model, however, clearly indicates that the linearity is invalid; low dose radiation is not hazardous, but is even beneficial or hormetic because of the adaptive response to radiation. This book provides ample evidence to negate the LNT model. This book is primarily compiled to get rid of the spell of the LNT model and release Fukushima people from undue torture. The book would also be useful to the public in general who have CT scans and have concerns. In addition, the people who use radiation world-wide such as nuclear power plant workers, radiation researchers, radiologists, and X-ray operators would be relieved to learn from reading this book that the alleged risk of low-dose radiation is illusionary and that the low-dose radiation is even beneficial. Policy makers of nuclear energy and radiation who are working for governmental and/or regulatory agencies are also recommended to read this book. Severe guidelines from a safety standpoint sometimes entrap people into a fear-stricken situation rather than save them, as no one was killed by radiation directly, but more than 1,000 people have been killed by the fear of radiation secondarily in Fukushima. By the same token, this book is recommended to civil activists and journalists who emphasise dangers of low-dose radiation and raise fear of low-dose radiation. It is the time to shed new scientific light on the outdated LNT model.