A C-NRPP Analytical laboratory or a C-NRPP Measurement professional can use an Accredited Independent Chamber for their initial Performance Test and for their quality control spike tests.
Accredited Radon Reference Chambers
|Radiation Safety Institute of Canada
102-110 Research Dr.,
Saskatoon, SK S7N 3R3 CANADA
Phone: 1 (306) 975-0566 ext. 224
4514 Taylorsville Road
Dayton, OH 45424
Telephone: (937) 236-8805 Ext 259
C-NRPP has an agreement with AARST-NRPP to approve radon chambers. To become certified as a performance test chamber, a firm must submit an application and complete the process with AARST-NRPP to become an accredited independent chamber.
You can find an application here: https://aarst-nrpp.com/wp/wp-content/uploads/2016/07/NRPP-Chamber-Certification-Application-2_11-09-15.pdf