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The Quantulus GCT 6220 is a liquid scintillation counter for ultra low-level sensitivity, in a lighter benchtop footprint to fit any lab. It has extremely high sensitivity and unmatched detection of low level Alpha and Beta radioactivity.

Part Number A622000
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21 CFR Part 11 Compatibility optionally available. Please consult your radiometric detection specialist.


The Quantulus GCT 6220 liquid scintillation counter is a fully loaded benchtop instrument with unsurpassed performance for measuring man made, cosmic and other natural radionuclides. Patented GCT technology combined with BGO guard background reduction accurately measures to near-background levels. Proprietary Dual PSA Discriminator and PSA Histogram improves accuracy for mixed and unknown samples.

Exclusive Standard Features

  • Patented Bismuth Germanium Oxide (BGO) and Guard Compensation Technology (GCT) enhances discrimination against background yielding the highest E2/B values available in a multipurpose liquid scintillation counting system
  • TR-LSC (Time-resolved Liquid Scintillation Counting) for high sensitivity, low background liquid scintillation counting
  • QuantaSmart Software a robust multitasking, easy networking environment with unlimited assays in a secure multiuser environment
  • Alpha Beta Separation uses Dual PSA Discriminator and PSA Histogram to improve accuracy for mixed and unknown samples
  • SpectraWorks 2 spectral analysis package that determines optimal counting regions, and calculates figure of merit automatically
  • Enhanced IPA (Instrument Performance Assessment) monitors performance metrics for the life of the instrument
  • Replay reanalyzes sample counts without recounting samples
  • Dynamic color correction ensures accuracy of tracking lower energy sample spectra over a wide quench range
  • Auxiliary Spectrum Memory stores rejected events for future analysis
  • Bi-directional sample conveyer with a capacity of up to 408 (20mL vials) or 720 (4 or 7 mL vials)
  • Varisette sample cassette for intermixing vial sizes without special adapters
  • Operational-status LED indicator for clear assay status updates at a glance

Additional Standard Features

  • Luminescence Detection flags percent luminescence to alert user of possible sample problems
  • Luminescence Correction adjusts for chemiluminescence interference
  • Direct DPM determines single-label DPM in any cocktail without the use of quench standards
  • Temperature Control maintains optimum conditions for a variety of samples
  • 60 Quick Count protocol flags with the flexibility to define unlimited assays
  • Fold-away ergonomic arm adaptable to enter data either sitting or standing
  • Built in Computer with Windows 10 Operating System

Physical data

  • Dimensions H/W/D 18.5/40.5/44 in (47/103/112 cm)
  • Weight 523 lb (238 kg)
  • Electrical requirements 100-240 Vac 50/60 HZ 3-prong grounded plug

Typical performance data

  • Energy range: 0-2,000 keV
  • Efficiency, Normal Count Mode (minimum acceptable):
    3H (0-18.6 keV): 60%
    14C (0-156 keV): 95%
  • Figure of Merit (E2/B), Normal Count Mode:
    3H (0-18.6 keV): 400
    14C (0-156 keV): 1,0000
  • Figure of Merit (E2/B), Super Low Level Count Mode (ULLCM):
    3H (0-18.6 keV): 800
    14C (0-156 keV): 6,000
  • Observed 3H Performance with 10 mL H2O in 10 mL Ultima Gold LLT and Plastic Vials with GCT high E2V2/B > 131,000 or more
  • Observed 14C Performance for 11 mL Bioethanol Samples in 9 mL Ultima Gold F in Plastic Vials with GCT high: E2V2/B > 1,030,000 or more

Note: The efficiencies, backgrounds, and E2 /B values for the Normal Count Mode were determined using PerkinElmer sealed large vial glass standards set P.N. 6008500 verified with NIST standard activity. Super Low Level Count Mode Values are determined using low level sealed large glass standards P.N. 6018914 verified with NIST standard activity. No maximum is specified for background.


21 CFR Part 11 Compatible Yes
Height 47.0 cm
Length 112.0 cm
Portable No
Width 103.0 cm
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Application Note

Determination of the 3H, Gross α/β and 222Rn Activity Concentration in Drinking Water with the Quantulus GCT 6220

The analysis of drinking water is a continued focus of many laboratories globally. While the determination of the activity of Tritium (3H), Radon-222 (222Rn) and gross a/ß-activity has historically been routine in many laboratories, the European Council Directive 2013/51/Euratom contained updated recommendations for sampling rate, detection limits, and other parameters which have forced many labs to upgrade instrumentation and adjust their previous methods. Learn how the Quantulus GCT 6220 provides the sensitivity needed to meet today’s most stringent compliance requirements.

PDF 723 KB


Totally RAD Infographic Flyer

Radiometric detection (RAD) is one of the most proven techniques for molecular quantitation around – and it’s still indispensable for key applications. Here’s the state of the industry, and where it’s headed.

PDF 470 KB

Specification Sheet