"Intense radiation" refers to a powerful and concentrated release of energy in the form of waves or particles that can be harmful to living organisms. Full definition
The massive black hole shown at left in this drawing is able to rapidly grow as intense radiation from a galaxy nearby shuts down star - formation in its host galaxy. (sciencedaily.com)
This question stands because the clouds are constantly being washed out by intense radiation, hence cracking the hydrogen molecules into atoms. (frogheart.ca)
Specifically it covers particle interaction with the metals and alloys used in nuclear reactor cores and hence subject to intense radiation fields. (brightsurf.com)