Long Beach Samples

The table below shows results from kelp in the Long Beach Harbor. These samples were taken in order to better understand the behavior of local inputs of Iodine-131 into the harbor ecosystem.

Please see What is the Source of I-131? for a discussion of Iodine-131.


Sample ID Location
LB-0a
Long Beach, Los Angeles County, CA
LB-0b
Long Beach, Los Angeles County, CA
LB-1
Long Beach, Los Angeles County, CA
LB-2a
Long Beach, Los Angeles County, CA
LB-2b
Long Beach, Los Angeles County, CA
LB-2c
Long Beach, Los Angeles County, CA
LB-2d
Long Beach, Los Angeles County, CA
LB-2e
Long Beach, Los Angeles County, CA
LB-3b
Long Beach
Anthropogenic Natural
Collection Date Cs-137 Cs-134 I-131 K-40 U-238 series (early) U-238 series (late) Th-232 series (early) Th-232 series (late) Be-7
11/19/2013
0.31 ± 0.05
nondetect (< 0.04)
221.2 ± 0.5
4088 ± 15
123.14 ± 25.16
1.10 ± 0.06
0.99 ± 0.25
0.73 ± 0.06
nondetect (< 0.45)
12/12/2013
0.20 ± 0.04
nondetect (< 0.04)
55.6 ± 0.2
3886 ± 9
69.17 ± 1.54
1.13 ± 0.05
1.50 ± 0.16
0.61 ± 0.05
1.62 ± 0.47
03/06/2014
0.30 ± 0.03
nondetect (< 0.04)
152 ± 1
3903 ± 11
47.0 ± 1.9
1.61 ± 0.05
1.18 ± 0.11
0.22 ± 0.02
nondetect (< 0.44)
07/08/2014
0.37 ± 0.04
nondetect (< 0.04)
45.1 ± 0.5
3228 ± 5
93 ± 2.3
1.35 ± 0.05
0.92 ± 0.12
0.17 ± 0.02
nondetect (< 0.40)
07/08/2014
0.30 ± 0.05
nondetect (< 0.05)
56.2 ± 0.6
3177 ± 12
76.7 ± 2.5
1.46 ± 0.06
1.39 ± 0.18
0.39 ± 0.04
1.20 ± 0.44
07/08/2014
0.36 ± 0.05
nondetect (< 0.04)
77.0 ± 0.6
3114 ± 6
73.6 ± 2.3
1.48 ± 0.05
0.85 ± 0.12
0.12 ± 0.02
nondetect (< 0.45)
07/08/2014
0.28 ± 0.04
nondetect (< 0.04)
251 ± 1
2712 ± 7
37.5 ± 2.2
1.59 ± 0.06
1.27 ± 0.15
0.24 ± 0.07
1.32 ± 0.47
07/08/2014
0.40 ± 0.07
nondetect (< 0.06)
99.3 ± 0.9
3236 ± 18
26.4 ± 2.7
0.81 ± 0.05
1.93 ± 0.20
0.18 ± 0.03
nondetect (< 0.59)
06/06/2016
0.27 ± 0.06
nondetect (< 0.06)
173.13 ± 0.60
3777 ± 7
24.2 ± 2.4
1.11 ± 0.07
1.01 ± 0.23
0.24 ± 0.04
1.8 ± 0.6


Table Notes:

  • All uncertainties quoted are "one-sigma," meaning that they represent a 68% confidence range for the quantity measured. Detection limits are also "one-sigma" in that they give the 68% confidence upper limit.
  • Radioactive isotopes are measured in units of Becquerels per kilogram dry weight (Bq/kg dwt). One Becquerel is one nuclear decay per second.
  • Data are decay-corrected to the date the sample was collected.


Update Log:

  • 10/17/2014 16:00 - initial data posted
  • 11/07/2014 16:20 - updated new data, all current sample measurements are up
  • 04/06/2015 10:00 - Samples from the third sampling period added
  • 07/15/2016 19:00 - Sample from the fifth sampling period added