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CAMRT Exam Questions And Accurate Answers
Tc-99m half-life and energy - ANSWER T= 6hrs 140keV Mo-99 half-life and energy - ANSWER T=66hrs 740keV and 778keV I-131 half-life and energy - ANSWER T=8 days364keV
I-123 half-life and energy - ANSWER T=13hrs159keV
In-111 half-life and energy - ANSWER T=67hrs171keV and 245keV
Xenon-133? Half life and energy? - ANSWER 5 days.81 keV.
Tl-201 half-life and energy - ANSWER T=3 days69-82keV (Hg x-rays), 135keV, 167keV
half-life and energy of Ga-67 - ANSWER T=3.26days
92keV, 185keV, 300keV, 394keV half-life and energy of Y90 - ANSWER 64hrsBeta
half-life and energy of 18-F - ANSWER T=110mins 511keV half-life and energy of C-11 - ANSWER T=20mins 511 half-life and energy of N-13 - ANSWER T=10min half-life and energy of O-15 - ANSWER T=2 min half-life and energy of Ga-68 - ANSWER 68mins half-life and energy of Rb-82 - ANSWER 76sec half-life and energy of Cs-137 - ANSWER 30years662keV
half-life and energy of Co-57 ANSWER 272days122keV and 136keV
1mCi =? Bq ANSWER 37MBq
Frequency of well counter efficiency - ANSWER annually Frequency of Gamma Camera peaking - ANSWER daily Frequency of Gamma Camera uniformity - ANSWER daily Frequency of Gamma Camera reolsution - ANSWER weekly Frequency of Gamma Camera linearity - ANSWER weekly Frequency of Gamma Camera collimator damage check - ANSWER annually Frequency of Gamma Camera SPECT COR - ANSWER weekly or monthly Frequency of Gamma Camera Jaszczak - ANSWER annually Frequency of PET blank scan - ANSWER daily Frequency of PET tomographic uniformity - ANSWER weekly Frequency of PET normalization - ANSWER quarterly/annually What is an unrestricted area? - ANSWER general public may enterMax exposure limit -- less than 0.02mSv/hr e.g waiting rooms What areas require the Rayonnement-Danger-Radiation sign? - ANSWER 1) any area in
which there is reasonable probability that a person in the area will be exposed to aneffective dose > 25uSv/hr; and/or
- a room where there is any nuclear substance in a quantity of more than 100 times theEQ
White I - ANSWER does not exceed 5uSv/hr at any location on the external surface of thepackage
Yellow II - ANSWER does not exceed 500uSv/hr at any location on the external surface ofthe package
TI does not exceed 1 Yellow III - ANSWER does not exceed 2mSv/hr at any location on the external surface ofthe package
TI does not exceed 10 Transport Index (TI) - ANSWER max radiation level in uSv/hr at one meter from theexternal surface of the package DIVIDED BY 10
When to use an ionization survey meter - ANSWER converts current to radiation unitsusually as a dose rate (mR/hr) requires a relatively high exposure rate to give a good reading Use when monitoring patient or package exposure levels When to use a GM counter (count rate meter) - ANSWER Finding contamination
Which radioactive kits need to be stored in the refrigerator - ANSWER MAA Gluceptate When do you need a license? - ANSWER more than 1EQ of a radioactive substance When must leak tests be performed - ANSWER every 12 months on sealed source that isin use and 50MBq or more OR every 24months on a sealed source that is storedOR if there is reason to believe it has been damaged Wipe test needs to be less than 200Bq Effective half life equation - ANSWER 1/Te= 1/Tb + 1/Tp Accumulated activity calculation - ANSWER Acum=Ao 1.44Te When is thyroid screening required - ANSWER When handing:
2MBq in open room>200MBq in fume hood
General level for thyroid screening - ANSWER ≤1kBq Investigation level for thyroid - ANSWER 1kBq - 10kBq internal investigation must be performed Reporting level for thyroid - ANSWER ≥10kBq
approved bioassay must be performed Above what threshold dose of thyroid therapy should a patient be isolated in the hospital- ANSWER doses over 1110MBq
What does the patient need to be read, before you can safely discharge them - ANSWERa midline reading at one meter away equal to or less than the equivalent emission of a 1110MBq source 16uSv/hr at TWO meters Class A radionuclides - ANSWER Alpha emitters and their daughters Class B radionuclides - ANSWER Relatively long lived gamma emitters and some betas131-I, Ga-67, 58-Co Class C radionuclides - ANSWER Short-lived Gamma and beta emitters Tc, the other iodines, Tl, Y90, P32Surface contamination limits in public areas - ANSWER Class A = 0.3Bq/cm Class B = 3 Bq/cm Class C = 30Bq/cm2Surface contamination limits in nuclear medicine room - ANSWER Class A = 3Bq/cm Class B = 30 Bq/cm Class C = 300 Bq/cm What is the rational for area monitoring - ANSWER to obtain ambient exposure levels How often should you perform area monitoring - ANSWER end of each day where RAMsare used, weekly where RAMs are stored
What if chi-square fails? - ANSWER recalibrate, recheck, replace Purpose of calibration on the Well counter or probe? - ANSWER to set the x-axis scale bytweaking the HV until the photopeak is centred in the PHA
frequency of well counter of probe calibration - ANSWER daily and before first use Purpose of constancy on well counter and probe - ANSWER verify that the energyspectrum looks normal, photopeak is centred in window
Purpose of energy resolution of well counter and probe - ANSWER to determine howwell the crystal can differential between photon energies
Normal expected values for percent energy resolution - ANSWER 8-12% using 137Cswith energy of 662keV. Larger for lower energies
Causes for worsening of energy resolution of well counter or probe - ANSWER fracturedcrystal (unlikely) Uncoupling of crystalCrystal hydration
What to do if energy resolution fails - ANSWER recalibrate, recheck, replace What will you see if the camera is off peak? - ANSWER floor will have hot/cold spotscorresponding to PMTs
if PHA is too high - ANSWER PMTs appear cold
if PHA is too low - ANSWER PMTs appear hot how many counts must a flood have to be quantitative - ANSWER 10-30 million how to test linearity on gamma camera - ANSWER bar phantom and slit phantom use line spread function Need intrinsic and extrinsic Moire pattern - ANSWER interference of collimator holes with bars Star artifact - ANSWER gamma ray energy too high for collimator barrel and pincushin artifact - ANSWER gamma ray locations bowed away from spacesbetween PMTs and toward the PMTs themselves. Seen when linearity map is turned off How often do survey meters need to be calibrated - ANSWER annuallyDC Constancy - ANSWER do todays readings fall within an acceptable range compared to prior readings (+/- 10%) Done daily DC accuracy - ANSWER does the DC measure the amount of activity correctly +/- 10% What is the standard SNMMI Gastric empty meal? - ANSWER 4oz liquid egg whites +18.5-37MBq colloid with two slices white bread + jam and half a cup water +125mlgastric emptying patient preparation - ANSWER 1) NPO 4hr prior
- Diabetics should have blood sugar under control
How long to be off amiodarone - ANSWER Several months (6 months) how long to be off oil containing contrast media used in bronchography, myelpgraphy,arthrography - ANSWER more than one year
How long to be off multivitamins for thyroid - ANSWER 1 weekeffect of lithium on thyroid - ANSWER results in decreased T4 and T3 results in enlarged thyroidTherefore increases I uptake
