NUCLEAR MEDICINE INSTRUMENTATION Exam Questions with 100% Correct Answers

NUCLEAR MEDICINE INSTRUMENTATION Exam Questions with 100% Correct Answers Radiation exposure rates are measured by - answerSurvey meters Contamination surveys can be performed with - answerA Geiger Muller counter A Geiger Muller counter is appropriate for contamination surveys because it - answerHas a rapid response time and can detect a wide range of exposure rates A Geiger Muller counter meets the NRC requirement for facilities to have - answerA survey meter capable of detecting exposure rates from 0.1 millirems per hour to one hundred millirems per hour GM counters may be fitted with - answerAn end window probe or a pancake probe The pancake probe - answerAllows the technologist to survey a larger area The end window probe - answermust be pointed directly at a source for accurate detection Portable ionization chambers are also known as - answerCutie pies Cutie pies or portable ionization chambers vs Geiger Muller counters - answerGeiger Muller counters are more sensitive. Cutie pies are more accurate The cutie pie is more accurate because - answerIt has a longer response time so the exposure rate is calculated based on more data The cutie pie is superior in measuring - answerHigh dose rates such as those in patient doses, especially therapeutic doses A well counter works by - answerUsing a Thallium activated sodium iodide crystal to detect low levels of radioactivity Compared to a gamma camera a well counter is - answerMore efficient The well counter's sensitivity limits the instruments use because - answerActivities greater than two microcuries can cause coincidence loss When too many photons strike the crystal in a well counter - answerCounts are lost while the instrument is in deadtime If the counting rate is very high in a well counter - answerIt may cause perpetual deadtime paralysis The well counter is used for - answerWipe tests to detect very low levels of removable contamination Well counter use in non imaging studies - answerused to count blood plasma and urine samples when Standards for blood volume or Schilling tests are diluted to a known percentage of the original patient dosage Uptake probe - answerUses a sodium iodide crystal to quantitate activity within a patient. May be connected to the spectrometer used by the well counter The uptake probe is not as sensitive as the well counter because of - answerDetector to source geometry Uptake probe uses what kinds of collimator - answerA cylinder shaped collimator which limits the Area seen the crystal and eliminates background activity The standard used for thyroid uptake studies - answerThe patient's capsule or another capsule prepared at the same time and activity. Dilution not required for uptake probe Splenic sequestration studies use what counter - answerThe uptake probe The dose calibrator is - answerAn ionization chamber that measures gamma photon dosages from thirty microcurie to curies. To measu