As of July 2019, the National Radon Safety Board has instituted a substantial change regarding renewal applications for electret ion chamber users. NRSB previously required renewal applicants to submit a repeat proficiency test upon each renewal. Now renewal applicants may opt to submit results from a recent (within the certification period) blind spiking test in lieu of the proficiency test. The blind spiking test comprised of 5 detectors must comply with the requirements stated in Radon Chamber Accreditation Policy, section 9.1.4.
 
As spikes are considered to be an important part of routine quality assurance, this policy change is intended to reduce the financial burdens associated with the renewal process.

What does this change mean for the NRSB application process?

For Initial Applicants
There is no change for initial applications. Applicants seeking an initial application to the NRSB must still complete a proficiency test with an NRSB-approved secondary chamber.
 
For Renewal Applicants
Applicants seeking to renew their NRSB credentials may now submit the results of five (5) blind spikes conducted within the renewal period in lieu of another proficiency test.