The data collected at Ridgecrest Intermediate School are presented here. Figure 1 is a schematic of the school site that shows the rooms that were tested for indoor radon colored according to the amount of radon in the rooms. Figure 1 also show the approximate locations of the sites where field gamma-ray measurements were made. Table 1 lists the results of the field gamma-ray measurements. Samples of the top five inches of soil were collected at two of the gamma-ray sites and Table 2 lists the results of analyses of those samples. Table 3 lists the results of the indoor radon measurements.
Figure 1. Schematic of rooms at Ridgecrest Intermediate School showing indoor radon levels and sites at which gamma-ray measurements were made.
Table 1. Results of gamma-ray spectrometer measurements at Cornerstone Elementary School. Site locations are indicated in Figure 1 (e.g. location number 1 refers to RIP1). The column labeled "Group" identifies the group to which the measurement was assigned as a result of classification of the gamma-ray data.
|
Location |
K |
eU |
eTh |
Group |
Latitude |
Longitude |
|
|
(%) |
(ppm) |
(ppm) |
|
(degrees) |
(degrees) |
|
RIP1 |
1.1 |
5.8 |
2.8 |
2 |
33.7667 |
-118.3774 |
|
RIP2 |
0.7 |
7.5 |
2.6 |
2 |
33.7662 |
-118.3780 |
|
RIP3 |
0.7 |
6.4 |
2.5 |
2 |
33.7671 |
-118.3775 |
|
RIP4 |
1.0 |
6.6 |
3.4 |
2 |
33.7660 |
-118.3785 |
|
RIP5 |
0.6 |
6.7 |
2.8 |
2 |
33.7673 |
-118.3780 |
|
RIP6 |
0.6 |
4.6 |
2.0 |
1 |
33.7665 |
-118.3784 |
|
RIP7* |
1.8 |
7.3 |
4.9 |
2 |
33.7663 |
-118.3780 |
|
RIP8* |
1.7 |
5.8 |
5.2 |
2 |
33.7666 |
-118.3781 |
|
RIP9* |
1.3 |
7.0 |
5.3 |
3 |
33.7660 |
-118.3784 |
|
RIP10* |
1.0 |
10.7 |
3.5 |
4 |
33.7670 |
-118.3785 |
|
RIP11* |
1.9 |
10.1 |
5.6 |
4 |
33.7670 |
-118.3781 |
* Locations 7 - 11 were measured with the gamma-ray detector sitting on the ground surface.
Table 2. Results of laboratory measurements of soil samples. The K, eU, and eTh concentrations were determined by a laboratory gamma-ray spectrometer and the field results are presented for comparison. Radon emanation fraction was determined as discussed in the section on methodologies.
|
Location |
Laboratory |
Field Spectrometer |
Radon |
Latitude |
Longitude | ||||
|
|
K |
eU |
eTh |
K |
eU |
eTh |
Eman. |
(degrees) |
(degrees) |
|
|
(%) |
(ppm) |
(ppm) |
(%) |
(ppm) |
(ppm) |
|
|
|
|
RIP1 |
1.2 |
7.3 |
3.5 |
1.1 |
5.8 |
2.8 |
0.34 |
33.7667 |
-118.3774 |
|
RIP2 |
0.8 |
9.2 |
3.7 |
0.7 |
7.5 |
2.6 |
0.22 |
33.7662 |
-118.3780 |
|
|
|
|
|
|
|
|
|
|
|
|
|
Bulk Density (g/cc) |
Water Content |
Porosity |
|
|
| |||
|
RIP1 |
0.91 |
22% |
0.66 |
|
|
| |||
|
RIP2 |
0.71 |
|
0.73 |
|
|
| |||
Table 3. Results of indoor radon measurements in classrooms.
|
Room |
Radon |
Start |
Stop |
||
|
Number |
(pCi/L) |
Date |
Time |
Date |
Time |
|
Blank |
0.3 |
28-Mar-03 |
18:09 |
30-Mar-03 |
18:09 |
|
202 |
0.4 |
28-Mar-03 |
15:49 |
30-Mar-03 |
15:50 |
|
203 |
1.1 |
28-Mar-03 |
15:47 |
30-Mar-03 |
15:48 |
|
204 |
2.6 |
28-Mar-03 |
15:46 |
30-Mar-03 |
15:47 |
|
205 |
0.4 |
28-Mar-03 |
15:52 |
30-Mar-03 |
15:52 |
|
302 |
0.3 |
28-Mar-03 |
15:27 |
30-Mar-03 |
15:30 |
|
303 |
0.6 |
28-Mar-03 |
15:28 |
30-Mar-03 |
15:31 |
|
303 |
0.4 |
28-Mar-03 |
15:29 |
30-Mar-03 |
15:31 |
|
306 |
0.2 |
28-Mar-03 |
15:24 |
30-Mar-03 |
15:28 |
|
307 |
0.2 |
28-Mar-03 |
15:25 |
30-Mar-03 |
15:29 |
|
308 |
0.5 |
28-Mar-03 |
15:26 |
30-Mar-03 |
15:29 |
|
401 |
0.5 |
28-Mar-03 |
15:31 |
30-Mar-03 |
15:33 |
|
403 |
0.4 |
28-Mar-03 |
15:32 |
30-Mar-03 |
15:34 |
|
405 |
0.2 |
28-Mar-03 |
15:33 |
30-Mar-03 |
15:35 |
|
407 |
0.2 |
28-Mar-03 |
15:34 |
30-Mar-03 |
15:36 |
|
410 |
0.5 |
28-Mar-03 |
15:36 |
30-Mar-03 |
15:38 |
|
501 |
0.2 |
28-Mar-03 |
15:38 |
30-Mar-03 |
15:40 |
|
503 |
0.6 |
28-Mar-03 |
15:39 |
30-Mar-03 |
15:41 |
|
506 |
0.5 |
28-Mar-03 |
15:44 |
30-Mar-03 |
15:45 |
|
506 |
0.6 |
28-Mar-03 |
15:44 |
30-Mar-03 |
15:45 |
|
507 |
0.7 |
28-Mar-03 |
15:43 |
30-Mar-03 |
15:44 |
|
508 |
0.2 |
28-Mar-03 |
15:42 |
30-Mar-03 |
15:44 |
|
509 |
0.2 |
28-Mar-03 |
15:40 |
30-Mar-03 |
15:42 |
|
Library |
0.9 |
28-Mar-03 |
15:50 |
30-Mar-03 |
15:51 |
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