IRRSP EXAM|QUESTIONS AND VERIFIED ANSWERS|GRADED
A+|PASS ON FIRST ATTEMPT|BRAND NEW 2026/2027 UPDATE!!!!!
ALARA - ANSWER As low as reasonably achievable
Proton - ANSWER Positive charge; 1 AMU
Neutron - ANSWER No charge; 1 AMU
Electron - ANSWER Negative charge, 1/1840th of the mass of a proton
AMU - ANSWER Atomic mass unit; the unit of measure for an atom
Atomic Number - ANSWER Z Number: the total number of protons in an atom
Atomic Weight - ANSWER A Number: The total mass of the atom (sum of proton and neu-
trons in that element)
What is the half life of IR-192? - ANSWER 74 days
What is the half-life of CO-60? - ANSWER 5.3 years
What is the gamma constant (emissivity value) for IR-192? - ANSWER 5.2R (5200 mR)
What is the gamma constant (emissivity value) for CO-60? - ANSWER 14R (14000mR)
Who was the first person to observe and record X-rays? - ANSWER Wilhelm Rontgen
1
, Who discovered Radioactivity? - ANSWER Henri Becquerel
Who coined the term "radioactivity?" - ANSWER Marie and Pierre Curie
Who discovererd Alpha Particles, Beta Particles, and Gamma Rays? - ANSWER Ernest
Rutherford
Where was the first medical use of an x-ray performed at? - ANSWER Massachusetts
General Hospital; it was used to X-ray a hand
Who's responsibility is it to adhere and follow all safety regulations regarding the use of radi-
ation? - ANSWER The radiographer's
What is electromagnetic radiation? - ANSWER Radiation that travels in waves that has no
mass nor charge. Ex: Gamma & X-ray
What is particulate radiation? - ANSWER Particles that have mass as well as energy. Ex:
alpha & beta
What is the difference between X-Ray and Gamma Radiation? - ANSWER The origin
What is Activation? - ANSWER Bombarding the material with neutrons
What is the quality factor of an alpha particle? - ANSWER 20
What is the quality factor of a beta particle? - ANSWER 1
2
A+|PASS ON FIRST ATTEMPT|BRAND NEW 2026/2027 UPDATE!!!!!
ALARA - ANSWER As low as reasonably achievable
Proton - ANSWER Positive charge; 1 AMU
Neutron - ANSWER No charge; 1 AMU
Electron - ANSWER Negative charge, 1/1840th of the mass of a proton
AMU - ANSWER Atomic mass unit; the unit of measure for an atom
Atomic Number - ANSWER Z Number: the total number of protons in an atom
Atomic Weight - ANSWER A Number: The total mass of the atom (sum of proton and neu-
trons in that element)
What is the half life of IR-192? - ANSWER 74 days
What is the half-life of CO-60? - ANSWER 5.3 years
What is the gamma constant (emissivity value) for IR-192? - ANSWER 5.2R (5200 mR)
What is the gamma constant (emissivity value) for CO-60? - ANSWER 14R (14000mR)
Who was the first person to observe and record X-rays? - ANSWER Wilhelm Rontgen
1
, Who discovered Radioactivity? - ANSWER Henri Becquerel
Who coined the term "radioactivity?" - ANSWER Marie and Pierre Curie
Who discovererd Alpha Particles, Beta Particles, and Gamma Rays? - ANSWER Ernest
Rutherford
Where was the first medical use of an x-ray performed at? - ANSWER Massachusetts
General Hospital; it was used to X-ray a hand
Who's responsibility is it to adhere and follow all safety regulations regarding the use of radi-
ation? - ANSWER The radiographer's
What is electromagnetic radiation? - ANSWER Radiation that travels in waves that has no
mass nor charge. Ex: Gamma & X-ray
What is particulate radiation? - ANSWER Particles that have mass as well as energy. Ex:
alpha & beta
What is the difference between X-Ray and Gamma Radiation? - ANSWER The origin
What is Activation? - ANSWER Bombarding the material with neutrons
What is the quality factor of an alpha particle? - ANSWER 20
What is the quality factor of a beta particle? - ANSWER 1
2
