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NMTCB Exam Review 2 Questions and Answers 100% Solved
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Exam of 11 pages for the course NMTCB at NMTCB (NMTCB Exam Review 2)
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NMTCB Exam Review 2Positron decay or emission is when a _______________ is converted to a neutron, a
positron, a neutrino, and energy. - answer proton
Annihilation of a electron and a positron results in a pair of _________________
gamma rays traveling ___________ degrees. - answer0.511 MeV; 180°
F-18 is an example of __________________ decay process. - answer positron
X-rays and Gamma-rays have the same characteristics, but they are named based on
their origin.
X-rays are emitted from the electron shells, where gamma-rays are emitted from the
_____________. - answer nucleus
A dose of Tc-99m has an activity of 26.3 mCi at 10:30. What is it's activity at 14:10? -
answer17.2 mCi
The decay factor for Tc-99m at 2 hours is: __________________. - answer0.794
Beta particle emitting radionuclides should not be shielded by a high-Z material (such as
lead) because _________________________ interactions are likely to occur. -
answerBremsstrahlung
What type of interaction occurs when a weak photon gives all of its energy to an inner
shell electron? - answerphotoelectric effect
An attenuator that is equivalent to 4 half value layers would reduce the radiation to
______ of its original strength. - answer6.25%
10mCi is equal to how many becquerels? - answer370 MBq
The dose equivalent for occupational, whole-body exposure is commonly limited to
50mSv. How many rem is this? - answer5 rem
A radiologist orders an In-111 cerebrospinal fluid shunt study. The dose vial comes with
a label indicating: activity 1.5mCi, volume 1ml. The ordering physician specifies an
injection of 0.5mCi in a 0.5ml volume. The technologist will first need to withdraw 0.33ml
(which will contain the prescribed 0.5mCi) from the dose vial, and then dilute it with
saline to have the prescribed volume of 0.5ml. What will the final concentration in the
dose to be injected? - answer1 mCi/ml
, The radiation intensity from a point source of Tc-99m is 9mR/hr at 3m from the source.
If the distance is changed to 9m, what is the new radiation intensity? - answer1.0 mR/hr
Use the inverse square law.
If 20 mR/hr are measured at 3 m, what is the dose rate at 0.5 m? - answer720 mR/h
What type of detector is a dose calibrator? - answergas-filled detector
You are working in the hot lab, standing next to a radioactive source producing 0.6
mR/h.
What radiation dose will you receive if you remain there for 2 hours? - answer1.2 mR
Heating thermoluminescent dosimeters will emit _______ in proportion to the amount of
radiation they have been exposed to. - answerlight
The purpose of using a Half Value Layer (HVL) is to determine what? - answerdecrease
in exposure rate
Which of the following is an advantage of an ionization chamber over a GM survey
meter? - answerIonization chambers give a true reading regardless of the radionuclide
energy.
Which of the following materials would be the best choice to shield a dose of F-18? -
answerthick lead
Assume for a particular radionuclide that1 HVL = 3mm. If 24mm of lead is used to shield
a source, how many HVLs are used? - answer8
Which of the following detectors contains a scintillation crystal? - answeruptake probe
Which of the following instruments has the highest detection efficiency? - answerwell
counter
What would the percentage of original exposure rate be if you applied 5 HVLs? -
answer3.1
If you had a room that contained 11mCi of Tc99m, what appropriate signage would you
need for the room? - answerCaution: Radioactive Materials
What is the maximum dose rate that a Yellow II package can have at the surface? -
answerno more than 50mR/hr
What is the annual ALARA Level I limit for whole body exposures? - answer500 mrem
Upon receiving doses for the day, the radioactive White I package must be opened
within ______________ of delivery. - answer3 hours
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