Table 2.
Characteristics of low-cost radon monitors given by the manufacturers [14].
| Manufacturer | FTLab (Republic of Korea) | Ecosense (USA) | Airthings (Norway) | |
|---|---|---|---|---|
| Monitor model | RadonEye and RadonEye Plus2 | EcoQube | View Radon, View Plus, Wave Plus, Wave Radon, and Corentium Home | |
| Sensitivity level | High | Low | ||
| Sensitivity (or calibration factor) in cph at 1 Bq/m3/cpm at 1 kBq/m3 | 0.84/14 | 0.025 */0.42 | ||
| CF uncertainty (k = 2) | no data | no data | ||
| Upper measurement range ** (Bq/m3) | 3700 and 9435 | 3700 | 20,000 | |
| Device background as the maximum equivalent radon concentration (Bq/m3) acceptable for new/long-term used monitors | no data/no data | no data/no data | ||
| Statistical uncertainty | Manufacturer assessment | <10% at 370 Bq/m3 after 10 h |
<10% at 200 Bq/m3 after 7 days |
|
| Our assessment using (5) | <10% at 370 Bq/m3 after 1.5 (0.5) h at k = 2 (k = 1) |
<10% at 200 Bq/m3 after 3.5 (1) day at k = 2 (k = 1) |
||
| <10% at 100 Bq/m3 after 5 h at k = 2 |
<10% at 100 Bq/m3 after 7 days at k = 2 |
|||
| Data lost (%) [14] | 2.2 and 2.4 | 18.9 | 0.8, 1.6, 6.1, no data for the last two models | |
* Data provided by the manufacturer following inquiry from the authors. ** The lower range depends on the sensitivity, the CF and statistical uncertainties, the measurement duration, and the device background, so it is better to indicate the device background instead of the lower measurement range.