title: Validation of efficiency tracing and zero detection threshold techniques using liquid scintillation analyser TriCarb.
abstract: Efficiency tracing with unquenched 14C and zero detection threshold with unquenched 3H as tracers are practical and simple techniques which have been implemented to quantify the activity of various beta emitters using liquid scintillation analyser. These techniques are used to study the influence of quench level on activity quantification and the activity levels up to which these techniques are applicable. The results indicate that, for an activity level of 166.67 Bq, both the techniques are in good agreement with the reference activity with a relative discrepancy of ≤4.6 %. The relative discrepancy of ~10 % is observed for extreme quench values of ~111. For all the radionuclides with the activity level of 1.67 Bq, the uncertainty in activity quantification raises to ~8 % and for the activity level from 8.33 to 100 Bq, the uncertainty reduces to 1 %.
authors.affiliation: Radiation Safety Systems Division, B-259 Tritium Lab, Mod. Labs, Bhabha Atomic Research Centre, Trombay, Mumbai, India. pjreddy@barc.gov.in
authors.forename: P J
authors.initials: PJ
authors.lastname: Reddy
authors.forename: S P D
authors.initials: SP
authors.lastname: Bhade
authors.forename: D A R
authors.initials: DA
authors.lastname: Babu
authors.forename: D N
authors.initials: DN
authors.lastname: Sharma
mesh_terms: D002713:Chlorine / Q000032:analysis; D009532:Nickel / Q000032:analysis; D011829:Radiation Dosage; D011868:Radioisotopes / Q000032:analysis*; D015203:Reproducibility of Results; D012588:Scintillation Counting / Q000379:methods*; D013326:Strontium Radioisotopes / Q000032:analysis; D013462:Sulfur Radioisotopes / Q000032:analysis; D014316:Tritium / Q000032:analysis; D035501:Uncertainty; D015021:Yttrium Radioisotopes / Q000032:analysis
chemical_list: D011868:Radioisotopes; D013326:Strontium Radioisotopes; D013462:Sulfur Radioisotopes; D015021:Yttrium Radioisotopes; D014316:Tritium; D002713:Chlorine; D009532:Nickel