Activity (radioactivity): the property of certain nuclides of emitting radiation by spontaneous transformation of their nuclei. Various units of (radio)activity have been used including curie (1 Ci = 3.7 x 1010 disintegrations per second) and becquerel ( 1 Bq = 1 disintegration per second).
https://www.remm.nlm.gov/dictionary.htm
contamination - a substance that contaminates. contaminant. material, stuff - the tangible substance that goes into the makeup of a physical object; coal is a hard black material; wheat is the stuff they use to make bread.
http://www.thefreedictionary.com/Radiation+contamination
Decay products (or daughter products): the isotopes or elements formed and the particles and high-energy electromagnetic radiation emitted by the nuclei of radionuclides during radioactive decay. Also known as decay chain products or progeny (the isotopes and elements).
https://www.remm.nlm.gov/dictionary.htm
A common misconception is the idea that exposure to radiation in turn makes someone radioactive. This is, usually, not the case. It’s important, then, to understand the differences between radiation, and radioactivity.
https://www.mirion.com/introduction-to-radiation-safety/radiation-vs-contamination/
Definition of radiation for English Language Learners. : a type of dangerous and powerful energy that is produced by radioactive substances and nuclear reactions. medical : the use of controlled amounts of radiation for the treatment of diseases (such as cancer)
https://www.merriam-webster.com/dictionary/radiation
Carcinogen: a cancer-causing substance. Cesium-137 (Cs-137): has a half-life of 30.17 years and decays by beta and gamma radiation. Cs-137 is produced by nuclear fission for use in medical devices and gauges and is one of the byproducts of nuclear fission processes in nuclear reactors and nuclear weapons testing.
https://www.remm.nlm.gov/dictionary.htm
Over time, as the number of unstable atoms decreases, the material becomes less radioactive. This time is measured by the “half life” of different radioactive elements. This is the amount of time it takes for half of the atoms in a given sample to decay and give off radiation. For example, carbon-14 has a half-life of 5730 years, so after that amount of time, a quantity of 100 atoms of C-14 would have turned into 50 C-14 atoms and 50 Nitrogen-14 atoms.
https://www.mirion.com/introduction-to-radiation-safety/radiation-vs-contamination/
4. an alteration in a linguistic form due to the influence of a related form, as the replacement in English of earlier femelle with female through the influence of male. contamination. 1. The deposit, absorption, or adsorption of radioactive material, or of biological or chemical agents on or by structures, areas, personnel, or objects. See also fallout; induced radiation; residual radiation.
http://www.thefreedictionary.com/Radiation+contamination
radioactive contamination. the undesirable addition of radioactive material to the body or part of the environment, such as clothing or equipment. Contamination of the body by beta radiation may occur through the ingestion, inhalation, or absorption of a beta emitter. Instruments, drapes, surgical gloves, and clothing that come in contact with serous fluids, blood, and urine of patients containing beta or gamma radiation emitters may be contaminated.
http://medical-dictionary.thefreedictionary.com/radioactive+contamination
Definition of radiation. 1  1a : the action or process of radiatingb : the process of emitting radiant energy in the form of waves or particlesc (1) : the combined processes of emission, transmission, and absorption of radiant energy (2) : the transfer of heat by radiation — compare conduction, convection.
https://www.merriam-webster.com/dictionary/radiation
and contamination by radioactive definition
The contamination by radioactive is defined as the undesirable addition of radioactive material to the body or part of the environment. The definition of radioactive contamination is, the undesirable addition of radioactive material to the body or part of the environment, such as clothing or equipment.