Guidance

Results of the 2020 intercomparison of passive radon detectors: text alternatives for graphs

Published 31 August 2021

Figure 1

Is exposure 1 between 16 November 2020 and 18 November 2020. It shows small fluctuations in the radon concentration hovering around 7,000 Bq m^-3, plus 3 days of EER readings.

Figure 2

Is exposure 2 between 23 November 2020 and 27 November 2020. It shows fluctuations in the radon concentration between 6,000 and 7,000 Bq m^-3, plus 4 days of EER readings.

Figure 3

Is exposure 3 between 11 November 2020 and 20 November 2020. It shows a gradual decrease in the radon concentration from over 8,000 to 6,000 Bq m^-3 plus 8 days of EER readings.

Figure 4

Is exposure 4 between 24 November 2020 and 25 November 2020. It shows a slight fluctuation in the radon concentration, hovering around 6,000 Bq m^-3 plus 2 days of EER readings.

Figure 5

Is exposure 5 between 6 November 2021 and 23 November 2021. It shows an initial radon concentration of around 4,000 Bq m^-3 which then suddenly increases to around 9,000 Bq m^-3 and then begins to drop, ending between 6,000 and 7,000 Bq m^-3, plus 11 days of EER readings.

Figure 6

Is for exposure 1. It shows the mean exposure and range (1SD) reported for each set of detectors by the participating laboratories, as stated in Table 4.1. A blue dotted horizontal line denotes the reference exposure, 378 kBq m^-3 h.

Figure 7

Is for exposure 2. It shows the mean exposure and range (1SD) reported for each set of detectors by the participating laboratories, as stated in Table 4.2. A blue dotted horizontal line denotes the reference exposure, 602 kBq m^-3 h.

Figure 8

Is for exposure 3. It shows the mean exposure and range (1SD) reported for each set of detectors by the participating laboratories, as stated in Table 4.3. A blue dotted horizontal line denotes the reference exposure, 1,640 kBq m^-3 h.

Figure 9

Is for exposure 4. It shows the mean exposure and range (1SD) reported for each set of detectors by the participating laboratories, as stated in Table 4.4. A blue dotted horizontal line denotes the reference exposure, 144 kBq m^-3 h.

Figure 10

Is for exposure 5. It shows the mean exposure and range (1SD) reported for each set of detectors by the participating laboratories, as stated in Table 4.5. A blue dotted horizontal line denotes the reference exposure, 2,718 kBq m^-3 h.

Figure 11

Is the transit exposure. It shows the mean exposure and range (1SD) reported for each set of detectors by the participating laboratories, as stated in Table 4.6. There is no blue dotted horizontal line as there was no reference exposure.

Figure 12a

Is a bar chart showing the distribution of mean exposure results for exposure 1, as stated in Table 5. The chart is approximately normally distributed, with a peak at 380 kBq m^-3 h mean exposure. A red dotted vertical line indicates the reference exposure, 378 kBq m^-3 h.

Figure 12b

Is a bar chart showing the distribution of mean exposure results for exposure 2, as stated in Table 5. The frequency peaks at 560 kBq m^-3 h mean exposure. A red dotted vertical line indicates the reference exposure, 602 kBq m^-3 h.

Figure 12c

Is a bar chart showing the distribution of mean exposure results for exposure 3, as stated in Table 5. The frequency peaks at 1,400 kBq m^-3 h mean exposure with a second slightly lower peak at 1,500 kBq m^-3 h mean exposure. A red dotted vertical line indicates the reference exposure, 1,640 kBq m^-3 h.

Figure 12d

Is a bar chart showing the distribution of mean exposure results for exposure 4, as stated in Table 5. The frequency peaks at 140 kBq m^-3 h mean exposure. The red dotted vertical line indicates the reference exposure, 144 kBq m^-3 h.

Figure 12e

Is a bar chart showing the distribution of mean exposure results for exposure 5, with a peak at 2,600 kBq m^-3 h mean exposure. A red dotted vertical line indicates the reference exposure, 2,718 kBq m^-3 h.

Figure 12f

Is a bar chart showing the distribution of mean exposure results for the transit exposures, with a peak at 10 kBq m^-3 h mean exposure, but there were more results in total in the 20 to 50 kBq m^-3 h mean exposure range than 10 kBq m^-3 h mean exposure. There were 4 sets with transit exposures over 60 kBq m^-3 h mean exposure. There is no red dotted vertical line as there was no reference exposure.

Figure 13

Is a stacked bar chart (with each bar totalling to 100%), showing the percentage of performance classes A (best) to F (worst) for each of the 5 exposures, with the lowest exposure on the left, increasing as you move to the right:

• for exposure 4, (144 kBq m^-3 h), A = 24%, B = 49%, C = 16%, D = 5%, E = 5%, F = 0%
• for exposure 1, (378 kBq m^-3 h), A = 46%, B = 46%, C = 5%, D = 3%, E = 0%, F = 0%
• for exposure 2, (602 kBq m^-3 h), A = 46%, B = 43%, C = 11%, D = 0%, E = 0%, F = 0%
• for exposure 3, (1,640 kBq m^-3 h), A = 35%, B = 51%, C = 14%, D = 0%, E = 0%, F = 0%
• for exposure 5, (2,718 kBq m^-3 h), A = 51%, B = 43%, C = 5%, D = 0%, E = 0%, F = 0%