NJ RADON MEASUREMENT PROFESSIONAL
EXAM (InterNACHI AND AARST) QUESTIONS
WITH CORRECT ANSWERS UPDATED 2025
GRADED A+.
, ✔✔
A _____ refers to the series of transformations that a given radionuclide will undergo, as well as the kind
of radiation it emits, which are characteristic of the radionuclide Ans - decay chain
_____ are the extremely small particles of which we, and everything around us, are made. Ans
atoms
✔✔ -
✔✔
If one atom were the size of the Houston Astrodome, its nucleus would be roughly the size of a _____.
Ans - pea
✔✔
T/F: The balance of the forces in the nucleus of an atom determines whether a nucleus is stable or
unstable (radioactive). Ans - true
✔✔
As an unstable nucleus emits radiation as it disintegrates, the radionuclide transforms to different
nuclides, and this process is called _____. Ans - radioactive decay
_____ is the energy that is released as particles or rays during radioactive decay. Ans✔✔ - radiation
_____ particles include two protons and two neutrons. Ans ✔✔ - alpha
✔✔
We're really concerned with the _____ particles, because they can be stopped by a sheet of paper
where they release their energy. Ans - alpha
✔✔
Some decay products of radon emit beta particles, but its alpha-emitting decay products pose a much
_____ health risk. Ans - greater
, _____ photons can pass through many kinds of materials, including human tissue. Ans ✔✔ - gamma
_____ are the source of cell damage in the lungs. Ans ✔✔ - RDPs (radon decay products)
T/F: Radon gas tastes like sulphur. Ans ✔✔ - false
T/F: If RDPs plate out on a wall, they are a hazard. Ans ✔✔ - false
✔✔
If the radon concentration is 75 pCi/L, and the decay-product concentration is 0.3 WL, the equilibrium
ratio would be calculated as follows: ER = (0.3) x (100) / 75 = _____. Ans - 0.4
The average indoor radon level is _____ pCi/L. Ans ✔✔ - 1.3
If a gallon container held air with 4 pCi/L, there would be about 4 (quarts per gallon) multiplied by 4
✔✔
(pCi/L) multiplied by 2.22 disintegrations per minutes, or about _____ disintegrations per minutes of
radon atoms in the container. Ans - 35.2
Radon is the _____ most important cause of lung cancer after smoking in many countries. Ans
2nd
✔✔ -
✔✔
T/F: The World Health Organization (WHO) says radon causes up to 15% of lung cancers worldwide.
Ans - true
✔✔
T/F: There exists a known threshold concentration below which radon exposure presents no risk.
Ans - false
✔✔
T/F: Since alpha particles are more massive and more highly charged than other types of ionizing
radiation, they are more damaging to living tissue. Ans - true
EXAM (InterNACHI AND AARST) QUESTIONS
WITH CORRECT ANSWERS UPDATED 2025
GRADED A+.
, ✔✔
A _____ refers to the series of transformations that a given radionuclide will undergo, as well as the kind
of radiation it emits, which are characteristic of the radionuclide Ans - decay chain
_____ are the extremely small particles of which we, and everything around us, are made. Ans
atoms
✔✔ -
✔✔
If one atom were the size of the Houston Astrodome, its nucleus would be roughly the size of a _____.
Ans - pea
✔✔
T/F: The balance of the forces in the nucleus of an atom determines whether a nucleus is stable or
unstable (radioactive). Ans - true
✔✔
As an unstable nucleus emits radiation as it disintegrates, the radionuclide transforms to different
nuclides, and this process is called _____. Ans - radioactive decay
_____ is the energy that is released as particles or rays during radioactive decay. Ans✔✔ - radiation
_____ particles include two protons and two neutrons. Ans ✔✔ - alpha
✔✔
We're really concerned with the _____ particles, because they can be stopped by a sheet of paper
where they release their energy. Ans - alpha
✔✔
Some decay products of radon emit beta particles, but its alpha-emitting decay products pose a much
_____ health risk. Ans - greater
, _____ photons can pass through many kinds of materials, including human tissue. Ans ✔✔ - gamma
_____ are the source of cell damage in the lungs. Ans ✔✔ - RDPs (radon decay products)
T/F: Radon gas tastes like sulphur. Ans ✔✔ - false
T/F: If RDPs plate out on a wall, they are a hazard. Ans ✔✔ - false
✔✔
If the radon concentration is 75 pCi/L, and the decay-product concentration is 0.3 WL, the equilibrium
ratio would be calculated as follows: ER = (0.3) x (100) / 75 = _____. Ans - 0.4
The average indoor radon level is _____ pCi/L. Ans ✔✔ - 1.3
If a gallon container held air with 4 pCi/L, there would be about 4 (quarts per gallon) multiplied by 4
✔✔
(pCi/L) multiplied by 2.22 disintegrations per minutes, or about _____ disintegrations per minutes of
radon atoms in the container. Ans - 35.2
Radon is the _____ most important cause of lung cancer after smoking in many countries. Ans
2nd
✔✔ -
✔✔
T/F: The World Health Organization (WHO) says radon causes up to 15% of lung cancers worldwide.
Ans - true
✔✔
T/F: There exists a known threshold concentration below which radon exposure presents no risk.
Ans - false
✔✔
T/F: Since alpha particles are more massive and more highly charged than other types of ionizing
radiation, they are more damaging to living tissue. Ans - true
