Practice Mock Questions 2026
Exam All Answers and
Illustrations Given
What is Pertechenate commonly used for? - ANSWER ✔✔Meckels
diverticulum, thyroid scans, salivary glands, gastric emptying
What is the annual dose limit for the lens of the eye for an occupational
worker? - ANSWER ✔✔50 mSv (5 rem)
Uniformity Test: - ANSWER ✔✔- checks for uniform distrubution of
counts
- ensures the camera does not have cold/hot spots
,- uses flood source
Linearity Test: - ANSWER ✔✔- checks if the camera accuratley
portrays distances/shapes without distortion
- ensures the camera's spatial response is linear
- uses bar pattern or line source
Spatial Resoulution - ANSWER ✔✔- asses camera's ability to resolve
small objects or fine details
- done with pinhole collimator
Sensitivty Test: - ANSWER ✔✔- measures how well the gamma
camera detects/responds to radiation
- a sealed source is placed distance from a camera to measure DPM
Cutie Pie (Ionization Chamber) - ANSWER ✔✔- used for surveying
sources and therapy areas
- measures high radiation levels
Geiger-Muller (GM) Counter - ANSWER ✔✔- checks for
contamination
- measures radiation levels (alpha, beta, gamma)
,Purpose of Collimators: - ANSWER ✔✔- used in SPECT/PET gamma
camera to focus/filter the gamma photons
Purpose of Bar Phantom: - ANSWER ✔✔- evaluates spatial
resolution
What scans are commonly done with converging collimator? -
ANSWER ✔✔- brain scans
- thyroid/parathyroid
- eye, ear, specific regions of the brain
Pulse Height Analyzer: - ANSWER ✔✔- filters out unwanted radiation
by analyzing the energy of the incoming gamma rays
Star Artifact - ANSWER ✔✔- bright central point with radiating lines
- pinhole collimators
- excessive RP activity in one area
What is the shelf-life and energy of Tc99? - ANSWER ✔✔shelf-life: 6
hours
energy: 140 kev
3
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, What is the shelf-life and energy of I-123? - ANSWER ✔✔shelf-life:
13.3 hours
energy: 159 kev
What is the shelf-life and energy of Ga-67? - ANSWER ✔✔shelf-life:
78 hours
energy: 93, 184, 300, 394 kev
What is the shelf-life and energy of In-111? - ANSWER ✔✔shelf-life:
2.8 days
energy: 171, 245 kev
What is the shelf-life and energy of Tl-201? - ANSWER ✔✔shelf-life:
73 hours
energy: 81 kev
What is the shelf-life and energy of F-18? - ANSWER ✔✔shelf-life:
110 minutes
energy: 511 kev
What is the shelf-life and energy of Ga-68? - ANSWER ✔✔shelf-life:
68 minutes
energy: 511 kev