You can find the basic Textbook in nuclear physics and in radiation detection and measurement (written by Jukka Lehto, 2016) and nuclear and radiochemistry related Compendia in this section. We have collected and created a number of compendia explaining specific NRC subjects and also have a number of to-the-point topic-explanation pages.

NRC Textbook - Basics of Nuclear Physics and of radiation detection and measurement

1. Free textbook "Basics of Nuclear Physics and of Radiation Detection Measurement" (Jukka Lehto, 2016)
2. Link to older NucWik version: NucWik.com
3. Link to even older NucWik site (at WikiSpaces.com) - https://nucwik.com/From_WikiSpaces/table_of_content.html