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I
A symbol for Iodine.

ICRP
A synonym for International Commission on Radiological Protection.

Ih
A symbol for inhour.

immediate decontamination
Decontamination carried out by individuals upon coming contaminated, to save life and minimize casualties. This may include decontamination of some personal clothing and/or equipment.

Related to decontamination.
Related to operational decontamination.
Related to thorough decontamination.


impact parameter
The smallest distance between a projectile and a target nucleus for which there is no interaction.

Symbol: b.

imparted specific energy
A synonym for absorbed dose.

In
A symbol for indium.

indium
A chemical element with atomic number 49. Indium was discovered by spectral analysis in 1863 by Ferdinand Reich and Theodor Richter. The name indium is derived from the Latin word indigo.

Symbol: In.

individual monitoring devices
Devices designed to be worn by a single individual for the assessment of dose equivalent such as film badges, thermoluminescence dosimeters (TLDs), pocket ionization chambers, and personal (lapel) air sampling devices.

Synonym: individual monitoring equipment.
Reference: 10CFR20.1003.


individual monitoring equipment
A synonym for individual monitoring devices.

induced radioactivity
Radioactivity that is produced by bombarding a substance with radiation. For example, irradiating the element fluorine (which contains only 19F) with thermal neutrons produces 20F, a radioactive nuclide with a half-life of about 11 s.

Related to neutron capture.

inelastic scattering
A type of scattering where a part of the projectile energy is transferred to the target nucleus.

inert gases
A synonym for noble gases.

inhour
A unit of reactor reactivity. It is that reactivity which will make the stable reactor period equal to 1 hour.

Symbol: Ih.
Related to cent.
Related to dollar.
Related to effective multiplication factor.
Related to reactivity.


institutional control
A period of time, assumed to be about 100 years, during which human institutions continue to control waste management facilities.

Reference: DOE Order 58020.2A.

intake
Material ingested, inhaled, or absorbed through the skin or otherwise introduced into the body.

Related to uptake.

integral absorbed dose
Symbol: Gy.
Related to absorbed dose.
Related to collective dose.
Related to committed dose equivalent.
Related to committed effective dose equivalent.
Related to dose.
Related to dose equivalent.
Related to effective dose equivalent.
Related to total effective dose equivalent.
Reference: 10CFR10.; NUREG-0544, Rev. 4.


internal radiation
Radiation produced by the decay of radioactive material in the body.

inverse square law
The intensity of a radiation field is inversely proportional to the square of the distance from the source.

inverted atom
An atom composed entirely of antimatter. It has a nucleus formed from antiprotons and antineutrons. Positrons are bound to this nucleus in atomic orbitals.

Related to exotic atom.

iodine
A chemical element with atomic number 53. Iodine was discovered in 1811 by Bernard Courtois who was conducting experiments on salt water brines. The name iodine is derived from iodes, Greek for violet.

Symbol: I.
Related to halogens.


ion
An atom or molecule that has a non-zero electric charge.

Synonym: charged particle.
Related to anion.
Related to atom.
Related to cation.


ionising radiation
A synonym for ionizing radiation.

ionization
Of or pertaining to the process of ionizing an atom, ion or molecule.

ionization chamber
A volume that contains a detection gas and electrodes which is used to count radiations or monitor radiation fields.

Related to ionization detector.

ionization detector
A device for detecting radiations that consists of a chamber filled with an appropriate gas and containing electrodes maintained at a high potential. Ions are produced by the interaction of radiation with the gas. These ions drift to the electrodes, producing a measurable electric current.

Synonym: gas counter.
Synonym: gas-filled detector.
Related to gas counter.
Related to gas flow counter.
Related to ionization chamber.


ionization potential
The energy required to remove an electron from an atom or molecule.

Acronym: IP.
Synonym: electron binding energy.
Related to binding energy.


ionizing radiation
Any electromagnetic or particulate radiation capable of producing ionization in matter. Examples of ionizing radiation include alpha particles, beta particles, gamma rays x-rays, neutrons, high-speed electrons, high-speed protons, and other particles capable of producing ions. This definition excludes non-ionizing radiation, such as radio- or microwaves, or visible, infrared, or ultraviolet light.

Synonym: ionising radiation.
Related to electromagnetic radiation.
Related to nonionizing radiation.
Related to radiation.


IP
An acronym for ionization potential.

Ir
A symbol for iridium.

irradiate
To expose to radiation.

irradiation
Of or pertaining to the process of exposing a substance or an object to radiation.

iridium
A chemical element with atomic number 77. Iridium was discovered in 1803 by Smithsonian Tennant who was conducting experiments on crude platinum. The name iridium is derived from iris, Latin for rainbow colors.

Symbol: Ir.
Related to transition metals.


iron
A chemical element with atomic number 26. Iron has been known from antiquity. The name iron is derived from the Latin word ferrum.

Symbol: Fe.
Related to transition metals.


isobar
(1) Two or more nuclides with the same number of total nucleons. The nuclides 40K, 40Ca, and 40Sc have 40 nucleons and are thus isobaric. Use the adjective form, isobaric, when talking about two nuclides with the same number of nucleons.

(2) The set of known or postulated nuclides that have the same number of nucleons. A mass chain. Use the plural form, isobars, to talk about multiple mass chains.

Synonym: A chain.
Synonym: mass chain.
Related to isomer.
Related to isotone.
Related to isotope.
Related to nuclide.


isomer
(1) Two or more nuclides with the same numbers of neutrons and protons but with different energies.

(2) An excited state in a nucleus with an appreciable half-life.

Related to isobar.
Related to isotone.
Related to isotope.
Related to nuclide.


isotone
Two or more nuclides with the same number of neutrons. The nuclides 14C, 15N, and 16O have 8 neutrons and are thus isotones.

Related to isobar.
Related to isomer.
Related to isotope.
Related to nuclide.


isotope
Two or more nuclides with the same number of protons. Isotopes are the same chemical element. The nuclides 5Li, 6Li, 7Li, and 8Li, all have 3 protons and are thus isotopes. Isotope is often incorrectly used in place of the term nuclide.

Related to isobar.
Related to isomer.
Related to isotone.
Related to nuclide.


isotope chart
A synonym for chart of nuclides.

isotope separation
The process of increasing the isotopic concentration of a nuclide relative to other isotopes of that element. This produces one sample enriched in that isotope and another that is depleted in that isotope. The depleted sample is known as a tailing.

Related to isotopic enrichment.
Related to tails.


isotopic abundance
The concentration of one isotope in a sample relative to the other isotopes of that element.

Synonym: abundance.
Related to cosmic abundance.
Related to elemental abundance.


isotopic enrichment
The process of increasing the concentration of one isotope in a sample relative to that of the other isotopes of that element.

Synonym: enrichment.
isotopic tracer
A synonym for tracer.

 
 
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