Nuclear Medicine Boards Exam Questions
With 100% Verified Answers.
What is the formula for thyroid uptake %? - answer✔Thyroid uptake %= Thyroid counts-patient
background counts(thigh)/ capsule counts- room background counts X100%
Refers to the fact that different types of radiation produce different biologic effects.... the ratio of
an absorbed dose of xrays or gammma rays to the amount of any other form of radiation that is
needed to produce the same biologic effect. - answer✔relative biologic effectiveness
Formula for relative biologic effectiveness? - answer✔RBE= Dose of x-ray or gamma radiation/
equivalent dose of radiation in question
associated with exposure to low level radiation over a prolonged period of time. Long term
exposure to love level rad can lead to leukemia and other forms of cancer. - answer✔Stochastic
Effects
the result of a high dose of radiation over a short period of time. These are directly proportional
to the amount of rad exposure. - answer✔Non Stochastic/ Deterministic Effects
As Low As Reasonably Achievable - answer✔ALARA
If the distance from a radioactive source is doubled, the radition exposure is _____ of that at the
original distance. - answer✔1/4
the amount of radiation it takes to produce 1 electrostatic charge in 1cc of dry air at standard
temperature and pressure. - answer✔Roentgen
the unit of measure applied to radiation exposure in humans... calculated by multiplying the
number of rads by the RBE. - answer✔REM
____ can be measured in types of matter other than air. - answer✔RAD (radiation absorbed
dose)
Member of the general public should be exposed to no greater than _____ millirem(mrem) per
year. - answer✔100 mrem
Individuals who are radiation workers can be exposed to a max of _____mrem per year unless
that are minors, in which case the annual max is ____mrem. - answer✔5000mrem, 500mrem
Female radiation worker who declares pregnancy may only be exposed to ____mrem throughout
her nine month pregnancy. - answer✔500mrem
Maximum permissible dose to the eye is ____mrem per year. - answer✔15,000mrem
Skin and extremities should be exposed to no more than ____mrem per year. -
answer✔50,000mrem
3 events that must be reported to the NRC - answer✔1. administration of therapeutic radiation
doses to the wrong patient
2. an administered dose that exceeds 20% of the total prescribed dose
3.Single therapeutic dose that varies by more than 20% from the written directive or a weekly
therapeutic dose that varies by more than 30% from the written directive.
Each wipe must encompass an area of at least ____ square centimeters. - answer✔100 square
centimeters
A restricted area is considered to be contaminated if a wipe test delivers a result greater than
________DPM/100cm^2 - answer✔20,000DPM/100cm^2 for isotopes such as Tc99m orTI 201
The threshold for a restricted area is lowered to ____DPM/100cm^2 if the area is contaminated
with a high energy isotope such as I131 or In111 - answer✔2,000DMP/100cm^2
What sign should be posted for areas with a radiation level below 5mR/hr? - answer✔"Caution
Radioactive Materials"
What sign should be posted for areas with a radiation level greater than 5mR/hr? -
answer✔"Caution Radiation Area"
What sign should be posted for areas with a radiation level that exceeds 100mR/hr? -
answer✔"Caution High Radiation Area"
Signs should be posted _____ from the radiation source or radioactive surface. - answer✔30cm
What kind of label should a package have if it has a surface radiation level less than 0.5mR/hr
and a 0 transportation index at 1 meter? - answer✔A White I label
What kind of label should a package have if it has a surface radiation level greater than 0.5mR/hr
but less than 50mR/hr and a transport index greater than 0 but less than 1.0 at 1 meter? -
answer✔Yellow II
What kind of label should a package have if it has a surface radiation level greater than 50mR/hr
but less than 200mR/hr and transport indexes greater than 1 but less than 10 at 1 meter? -
answer✔Yellow III
What kind of label should a package have it is has a surface radiation level of greater than
200mR/hr but less than 1000mR/hr and transport indexes greater than 10 at 1 meter? -
answer✔Yellow III Exclusive Use label
Radioactive waste can legally be decayed in storage if the isotope has a physical half life of less
than ___ days - answer✔65
Radioactive waste must be held in storage for no less than ___ half lives and must emit no
measurable radiation. - answer✔10
Department wipe tests and survey records should be retained for ____ years - answer✔3
all records of radioactive material transferred from one facility to another, including flood
sources, radioactive markers, and attenuation correction sources records should be retained for
___ years - answer✔5
All leak tests that have been performed on the inventory of sealed sources records should be
retained for ___ years - answer✔5
All records of I131 bioassays performed on radiation workers should be retained _____ -
answer✔Indefinitely
Should be performed on all radiation workers involved in I131 therapeutic procedures -
answer✔Bioassay
If a radiation worker has absorbed more than _____ of I-131 in a year, the worker should be
relieved of isotope handling duties for the remainder of the year. - answer✔3uCi
Type of radiation therapy in which the radioactive source is surgically implanted into a patient. -
answer✔Radiation Brachytherapy
Total effective dose equivalent for occupational radiation workers should not exceed ____ per
year - answer✔5 rem
Total organ dose equivalent should not exceed ____ rem per year for radiation workers -
answer✔50 rem
Includes exposure to all organs of the body except the lens of the eye for radiation workers -
answer✔Total organ dose equivalent
The external dose of radiation to the lenses of the eyes should not exceed ____rem per year for
radiation workers. - answer✔15 rem
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