IRRSP UPDATED Exam Questions and
CORRECT Answers
An atom, group of atoms, molecules or particles that have acquired or are regarded as having
a net electric charge. - CORRECT ANSWER- Ion
Atoms having the same number or protons but a different number on neutrons in the nuclei.
Atoms with the...
An atom, group of atoms, molecules or particles that have acquired or are regarded as having
a net electric charge. - CORRECT ANSWER- Ion
Atoms having the same number or protons but a different number on neutrons in the nuclei.
Atoms with the same atomic number (the same chemical element) but different atomic
weights. - CORRECT ANSWER- Isotope
Any source that disrupts the electrical balance of an atom and results in the production of
ions. - CORRECT ANSWER- Ionization
The radation dose or amount of radation that has been absorbed by a substance. Measured in
rads (greys). - CORRECT ANSWER- Absorbed dose
The process whereby the particles or photons in a beam of radation are reduced in number or
energy as they pass through a medium. - CORRECT ANSWER- Absorption
The activity of a radioisotope is the number of disintegrations that occur for a given quantity
of the radioisotope during a given length of time. Activity is measured in curies (becquerel) -
CORRECT ANSWER- Activity
The acronym for (As Low As Reasonably Achievable) which means making every effort to
maintain and control exposures as far below the dose limits as in practical. This consept
comes out of the Code of Federal Regulation 10 CFR Part 20. - CORRECT ANSWER-
ALARA
A small electronic device, required to be worn by a radiographer, with an audible alarm set to
trigger at 500 mR/h (5000 uSv/h). - CORRECT ANSWER- Alarming rate meter
A positive electrically chargerd particle of radation consisting of 2 protrons and 2 newtrons
(same as helium nucleus). It is emitted from the nucleus of many radioactive materials during
radioactive decay. ( + charge) - CORRECT ANSWER- Alpha particle
, An electrically charged particle of radation emitted from the nucleus of many radioactive
materials during radioactive decay. A beta particle is a fast-moving electron, sometimes
moving close to the speed of light.
( - charge) - CORRECT ANSWER- Beta particles
High energy, short wavelenghth electromagnetic radation emitted during radioactive decay. -
CORRECT ANSWER- Gamma rays
The reduction in the intensity of radation as it passes through a material. - CORRECT
ANSWER- Attenuation
A unit if matter consisting of a nucleus (made up of neutrons and protons) and electrons that
surround the nucleus. The smallest part of an atom that retains the properties of the element. -
CORRECT ANSWER- Atom
The mass/weight of an atom, usually expressed in atomic mass units (AMU). - CORRECT
ANSWER- Atomic mass
This unit is based on 1/16 of the weight of an oxygen-16 atom. One neutron or one proton
weighs approximately 1 AMU. - CORRECT ANSWER- Atomic mass units
The total number of protons in an atom. The atomic number determines the element and its
chemical properties. It is also known as the Z number. - CORRECT ANSWER- Atomic
number
The total mass of an atom. It is approximately equal to the total number of protons and
neutrons in the nucleus of an atom and measured in atomic mass (AMU). - CORRECT
ANSWER- Atomic weight
The SI unit of radiation activity that is equal to one disintegration per second.
3.7*10^10 Bq = 1 Ci. - CORRECT ANSWER- Becquerel (Bq)
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