When the "detection efficiency" is not the "detection" efficiency.
D002138:Calibration; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods; D019544:Equipment Failure Analysis / Q000295:instrumentation / Q000379:methods* / Q000592:standards; D011829:Radiation Dosage; D011868:Radioisotopes / Q000032:analysis; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods* / Q000592:standards; D012588:Scintillation Counting / Q000295:instrumentation / Q000379:methods; D012680:Sensitivity and Specificity
D011868:Radioisotopes