hydrophilic means water-loving, but is usually used in the context of substances that are easily wetted, but do not dissolve. So although table salt is technically hydrophilic, the term is not used to describe salt. Concrete, on the other hand is hydrophilic. Wood, cotton, and leather are hydrophilic.
Depending on what aspect of radiation is being measured, different terms are applied: 1  For the amount of radiation being given off by a radioactive material: the conventional unit is curie (Ci) and the SI unit becquerel (Bq).  For radiation absorbed by a person: the conventional unit is rad and the SI unit gray (Gy).
Radiation is the process where waves or energy particles (e.g.: Gamma rays, x-rays, photons) travel through a medium or space. The unstable nuclei of radioactive elements are trying to become stable by emitting radiation. Radiation can be either ionizing or non-ionizing. Ionizing radiation has high energy, and when it collides with another atom, it will be ionized, emitting another particle (e.g. an electron) or photons.