Medical Dosimetry Certification Study
Guide Exam Actual Questions and
Answers 2026
an alpha particle is identical to a helium nucleus with a mass
number of _____ and electrostatic charge of _____ -
correct answer ✅4 and +2
alpha emission changes the identity of e radionuclide. T or F -
correct answer ✅true
226 RA is a _____ emitter -
correct answer ✅alpha
226 RA is a _____ emitter -
correct answer ✅alpha
60Co is a _____ emitter -
correct answer ✅beta
what are the gamma energies in MeV usually attributed to the 60
Co source? -
correct answer ✅1.17 and 1.33 MeV
,Medical Dosimetry Certification Study
Guide Exam Actual Questions and
Answers 2026
does emission of beta change the identity of the radionuclide? -
correct answer ✅yes
a positron is identical to an electron in all respects except it is ____
-
correct answer ✅positively charged
in beta decay, a neutron becomes a _____ -
correct answer ✅proton
nuclides decaying by beta decay are ____ rich -
correct answer ✅neutron rich, since beta decay tends to increase
the number of protons
positron decay transforms a proton into a _____ -
correct answer ✅neutron, so they are proton rich
does emission of gamma radiation change the identity of the radio
nuclide -
correct answer ✅no
,Medical Dosimetry Certification Study
Guide Exam Actual Questions and
Answers 2026
gamma emissions take the nuclide only from _____ state to _____
state -
correct answer ✅excited to ground
what usually follows beta particle emission in radioactive decay -
correct answer ✅gamma
name some examples of pure beta emitters -
correct answer ✅32Pa and 90Sr
when the excited state of the daughter nuclide is having a long half-
life the nuclides behave as _____ -
correct answer ✅pure gamma emitters, ex. 99mTc
electron capture usually occurs in _____ radioactive elements -
correct answer ✅high Z
_____ & _____ are competing modes of decay -
correct answer ✅electron capture and positron emission, and they
lead to the same daughter nuclide by converting a proton to a
neutron
, Medical Dosimetry Certification Study
Guide Exam Actual Questions and
Answers 2026
a neutrino is a particle of_____ mass and _____ charge postulated
to account for the non-conservation of energy during beta decay -
correct answer ✅negligible mass and zero charge
_____ is conserved in radioactive decay -
correct answer ✅mass
222Rn is what kind of emitter -
correct answer ✅alpha emitter
32P is what kind of emitter -
correct answer ✅pure beta emitter
59Ni is what kind of emitter -
correct answer ✅electron capture radio nuclide
90Sr is what kind of emitter -
correct answer ✅beta emitter
Guide Exam Actual Questions and
Answers 2026
an alpha particle is identical to a helium nucleus with a mass
number of _____ and electrostatic charge of _____ -
correct answer ✅4 and +2
alpha emission changes the identity of e radionuclide. T or F -
correct answer ✅true
226 RA is a _____ emitter -
correct answer ✅alpha
226 RA is a _____ emitter -
correct answer ✅alpha
60Co is a _____ emitter -
correct answer ✅beta
what are the gamma energies in MeV usually attributed to the 60
Co source? -
correct answer ✅1.17 and 1.33 MeV
,Medical Dosimetry Certification Study
Guide Exam Actual Questions and
Answers 2026
does emission of beta change the identity of the radionuclide? -
correct answer ✅yes
a positron is identical to an electron in all respects except it is ____
-
correct answer ✅positively charged
in beta decay, a neutron becomes a _____ -
correct answer ✅proton
nuclides decaying by beta decay are ____ rich -
correct answer ✅neutron rich, since beta decay tends to increase
the number of protons
positron decay transforms a proton into a _____ -
correct answer ✅neutron, so they are proton rich
does emission of gamma radiation change the identity of the radio
nuclide -
correct answer ✅no
,Medical Dosimetry Certification Study
Guide Exam Actual Questions and
Answers 2026
gamma emissions take the nuclide only from _____ state to _____
state -
correct answer ✅excited to ground
what usually follows beta particle emission in radioactive decay -
correct answer ✅gamma
name some examples of pure beta emitters -
correct answer ✅32Pa and 90Sr
when the excited state of the daughter nuclide is having a long half-
life the nuclides behave as _____ -
correct answer ✅pure gamma emitters, ex. 99mTc
electron capture usually occurs in _____ radioactive elements -
correct answer ✅high Z
_____ & _____ are competing modes of decay -
correct answer ✅electron capture and positron emission, and they
lead to the same daughter nuclide by converting a proton to a
neutron
, Medical Dosimetry Certification Study
Guide Exam Actual Questions and
Answers 2026
a neutrino is a particle of_____ mass and _____ charge postulated
to account for the non-conservation of energy during beta decay -
correct answer ✅negligible mass and zero charge
_____ is conserved in radioactive decay -
correct answer ✅mass
222Rn is what kind of emitter -
correct answer ✅alpha emitter
32P is what kind of emitter -
correct answer ✅pure beta emitter
59Ni is what kind of emitter -
correct answer ✅electron capture radio nuclide
90Sr is what kind of emitter -
correct answer ✅beta emitter
