Low Background Counting Facility

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Services and Activities



SNOLAB HPGe Gamma Counters:

The SNOLAB Low Background Counting Facility offers gamma counting of materials using low background HPGe detectors. Different HPGe detectors at SNOLAB to screen materials for radioisotopes U, Th, K, Co-60, Cs-137 includes:

PGT Detector COAX Detector Well Detector VDA Detector Gopher Detector PGT Coaxial Detector (PGT)
Canberra Coaxial Detector (Lively)
Canberra Well Detector
Eurisys Mesures Coaxial Detector (Vue Des Aples)
Canberra Coaxial Detector (Gopher)

Details on the Detector properties and sensitivities can be found on Gamma Counting Facilities page.

Please visit the Assay Request Form page to request for gamma counting services.


Alpha Counting:

We perform measurements of surface alpha contamination in XIA Counter
materials using the XIA UltraLo-1800 alpha counter. The sensitivity
of the XIA alpha counter at SNOLAB in terms of emissivity is 0.00158±0.00011 alpha/cm2/h.

Specifications for sample:

Maximum sample weight: 9kg
Maximum sample thickness: 6.3mm

Please visit the Assay Request Form page to request for alpha counting services.


Radon Emanation Measurements:

We provide Radon emanation study of all construction materials for new, existing, and proposed experiments (to be located) at SNOLAB. We also provide services to experiments outside of SNOLAB around the globe. These materials are measured for 222Rn to ensure radiopurity. Two different techniques are employed at SNOLAB for Rn emanation studies:

Electrostatic Counter(ESC) Rn Emanation Study:
Radon Emanation Studies using Bronze and Xeolite/charcoal traps: This system consist of two liquid nitrogen cooled trap filled with Bronze wool and Xeolite/charcoal wool to stop radon.


SNOLAB currently operates low background facilities in the SNOLAB surface laboratories and in the deep underground laboratory at the 6800 ft level (6000 m.w.e.) of the Creighton Mine, which is located near Sudbury, Ontario, Canada.

This page is restricted to authorized SNOLAB participants. For information contact webmaster@snolab.ca