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    If you are not familiar with working around radiation or radioactive material, the terms and concepts may confuse you at first. Let's look at some of the properties of radiation and radioactive material.

    It is important to note that exposure to radiation does not result in contamination of the worker. You may become contaminated only through direct contact with material that has removable radioactive material, or by working in areas where this contaminated material is handled.

    Ionization - The process of ionization is important in understanding radiation, because it is this process that differentiates ionizing radiation from other types. Ionization is the process of removing electrons from atoms. If enough energy is supplied to remove electrons from the atom the remaining atom has a + charge. The positive charges atom and the negatively charges electron are called an ion pair. Ionization should not be confused with radiation. Ions (or ion pairs) can be the result of radiation exposure and allow the detection of radiation.

    Typically, we classify types of radiation as ionizing or non -ionizing radiations depending on whether or not the radiation can form ion pairs in common material such as air ot tissue.

    Review:

    Ionizing radiation may be defines as 1) in the form of 2) or 3) which has sufficient energy to 4) matter.

    Unstable atoms which give off radiation when they decay are known as 5) material.

    Radioactive material on surfaces or in liquids, which might be easily transferred to surfaces or personnel is known as 6).

    Ionization is the process of removing 7) from 8).

    After two half-lives, what percent of the original radioactive material will remain? 9).

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