PMID- 7499150
OWN - NLM
STAT- MEDLINE
DCOM- 19960117
LR  - 20190722
IS  - 0017-9078 (Print)
IS  - 0017-9078 (Linking)
VI  - 70
IP  - 1
DP  - 1996 Jan
TI  - A comparison of four aqueous-miscible liquid scintillation cocktails with an 
      alpha/beta discriminating Wallac 1415 liquid scintillation counter.
PG  - 41-6
AB  - This work was directed towards an assessment of alpha/beta separation, alpha 
      detection efficiency, energy resolution, quench sensitivity, and background count 
      rate for four commercially available liquid scintillation cocktails using a 
      Wallac 1415 liquid scintillation counter. The four cocktails were Wallac Oy 
      OptiPhase HiSafe 3 and HiSafe 2, and Packard Ultima Gold AB and Ultima Gold XR. 
      Aqueous radioactive solutions were prepared in 0.1 N HCl and contained 241Am 
      (5.49 MeV alpha) and 90Sr/90Y (0.46/2.28 MeV beta-). The radioactive solutions 
      were loaded into the cocktails at a ratio of 1 mL of aqueous solution to 10 mL of 
      cocktail in 20 mL high-density polyethylene (HDPE) liquid scintillation vials. 
      The effect of three levels of chemical quench on the various properties of 
      interest was assessed for each of the LS cocktails. Alpha/beta discrimination was 
      quantified by the fraction of beta interactions that "spillover" into the alpha 
      window and vice versa, at the working discriminator setting. The working 
      discriminator setting was defined as the point where the spillover of beta 
      interactions into the alpha window and alpha interactions into the beta window 
      were equal. For the low-quench samples, Ultima Gold AB had the lowest spillover 
      (0.25%) and Ultima Gold XR had the highest spillover (0.8%). For the high-quench 
      samples, the spillover ranged from 4% (HiSafe 3) to 10.5% (Ultima Gold XR). The 
      detection efficiency for 241Am was nearly 100% and decreased with increased 
      quench because of loss from spillover. HiSafe 2 gave the best energy resolution, 
      500 keV (FWHM), for the low-quench sample. The lowest background count rate was 
      achieved with Ultima Gold AB, 0.056 cpm in the 241Am window, for a low-quench 
      blank.
FAU - DeVol, T A
AU  - DeVol TA
AD  - Department of Environmental Systems Engineering, Clemson University 29634-0919, 
      USA.
FAU - Brown, D D
AU  - Brown DD
FAU - Leyba, J D
AU  - Leyba JD
FAU - Fjeld, R A
AU  - Fjeld RA
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PL  - United States
TA  - Health Phys
JT  - Health physics
JID - 2985093R
SB  - IM
MH  - *Alpha Particles
MH  - *Beta Particles
MH  - *Scintillation Counting
EDAT- 1996/01/01 00:00
MHDA- 1996/01/01 00:01
CRDT- 1996/01/01 00:00
PHST- 1996/01/01 00:00 [pubmed]
PHST- 1996/01/01 00:01 [medline]
PHST- 1996/01/01 00:00 [entrez]
AID - 10.1097/00004032-199601000-00007 [doi]
PST - ppublish
SO  - Health Phys. 1996 Jan;70(1):41-6. doi: 10.1097/00004032-199601000-00007.