ANTIBIOTIC SUSCEPTIBILITY TESTING. Bacteria demonstrate two kinds of resistance to antibiotics, namely intrinsic resistance and acquired resistance. Intrinsic resistance means that the species was resistant to an antibiotic even before its introduction.
Radioactive contamination and radiation exposure could occur if radioactive materials are released into the environment as the result of an accident, an event in nature, or an act of terrorism. Such a release could expose people and contaminate their surroundings and personal property.
Radiation occurs when energy is emitted by a source and then travels through a medium, such as air, until it is absorbed by matter. Radiation can be described as two basic types, ionizing and non-ionizing radiation. Non-ionizing radiation. Ionizing radiation. 1  Natural background radiation. 2  Cosmic radiation. 3  Terrestrial radiation. 4  Inhalation. 5  Ingestion. 6  Artificial sources of radiation.