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 energy that moves through space or matter at a very high speed. This energy can be in the form of particles, such as alpha or beta particles, which are emitted from radioactive materials, or waves such as light, heat, radiowaves, microwaves, x-rays and gamma rays. Radioactive materials, also known as radionuclides or radioisotopes, are atoms that are unstable.