The Corentium Digital Radon Gas Monitor measures the average value of the
radon gas levels for 1 day, for 7 days, and accumulative for the last year.
Since it is battery powered, the monitor can easily be moved around the
building, in order to get the full overview of the radon in the home, the
workplace, the school or in the hospital. Compared to traditional technology,
Corentium makes it much easier to locate the radon entry in the buildings.
Radon monitors should preferably undergo international comparative tests, in
order to compare against other technologies and producers. Since there are so
few similar digital monitors in the marked, the Corentium monitor has so far
only been able to be tested against traditional alpha track detectors.
The Corentium monitor (named ‘Canary’ in the European market) was in July
2011 tested at the National Institute of Radiological Sciences (NIRS) in Japan.
NIRS has calibrated laboratories, and are certified to conduct such tests. The
methodology used is that we send a number of monitors to the laboratory; they
conduct a test at (for us) an unknown radon level (blind test), and return the
monitors to us. We then report our results to them, before they present the
correct values, i.e. their measured results. For alpha track detectors,
typically 70% of the participants have a result within +-20% of the reference
value. This implies that measuring with an alpha track detector in a room with
exactly 2.7 pCi/L (100 Bq/m3) over a two months period, the
measurements done in that room with an alpha track detector from a random
supplier will show values from 1.62 pCi/L (60 Bq/m3) up to 3.78 pCi/L
(140 Bq/m3) with 95% probability. In the test at NIRS, Canary had a deviation of 3% of the NIRS reference value. Since the reference value has an
uncertainty of 6%, the Canary is thus well within the NIRS laboratory
measurement uncertainty.This means that for a 2 month measurement period
at 2.7 pCi/L (100 Bq/m3) - as discussed above regarding the
alpha track detector - one can expect that a random Corentium monitor shows
between 2.43 pCi/L (90 Bq/m3) and 2.97 pCi/L (110 Bq/m3).
In September 2012 Canary was tested in the Federal Office for Radiation
Protection (Bfs) in Germany. 21 monitors were tested against reference monitors,
and all were statistically measured to be within the laboratories own
measurement uncertainty – which is 7%.In June 2013 the Corentium was again tested at BfS. 6
monitors were exposed for 1100 h*kBq/m3 and showed an average of 3.6%
below the BfS reference value.Corentium was in 2013 tested at IRSN (Institut de
Radioprotection et de Surete Nucleaire) in France. The test was conducted
over 3 months at a radon level of 4.59 pCi/L (170 Bq/m3). The average
for the 20 tested devices was 4.51 pCi/L (167 Bq/m3).Corentium has also been tested in calibrated radon
laboratories in the Czech Republic. These tests verify that Corentium shows the
same radon values irrespective of any changes in temperature, humidity, aerosols
(dust particles in the air) and electromagnetic fields. This is in contrast to
many monitors that are sensitive, and will typically show wrong results when
these parameters change.