Results from Second Sampling Period

The table below shows the radioactive isotopes measured in each of the kelp samples, corrected to time of collection during the second sampling period (June to August 2014). Some samples were taken beyond this period due to logistical issues. To date, all of the samples have been analyzed and are shown in the table. All data is based on a single sample size (n=1) of 6.5 kg fresh weight of blade tissue.

For a discussion of the radioactive isotopes shown in the table below, please see Results from First Sampling Period.


Sample ID Location
UAS-2
Juneau, AK
KSMSC-2
Kodiak Island, AK
Sitka-2
Sitka, AK
RES-3
Tofino, BC
DC-3
Bamfield, BC
DC-4
Bamfield, BC
RRU-2
Sooke, BC
WADOH-2
Quillayute Needles Wildlife Refuge, WA
ODFW-2a
Oregon
ODFW-2c
Oregon
ODFW-3b0
Redfish Rocks, OR
ODFW-2b
Oregon
HSU-2
Humboldt County, CA
BML-2
Van Damme State Park, CA
CDFW-2
Tomales Bay, CA
HMS-2
Pacific Grove, CA
REED-2c
Santa Barbara, CA
REED-2b
Santa Barbara, CA
REED-2a
Santa Barbara, CA
SBCK-2
Santa Barbara, CA
LEO-1
Leo Carrillo State Beach
ESCON-2
Escondido Canyon
UCSB-2
Valley, Santa Cruz Island
OXY-2
Rancho Palos Verdes, Los Angeles County, CA
LAW-2
Bunker Point, Palos Verdes
LB-2b
Long Beach, Los Angeles County, CA
LB-2a
Long Beach, Los Angeles County, CA
LB-2e
Long Beach, Los Angeles County, CA
LB-2d
Long Beach, Los Angeles County, CA
LB-2c
Long Beach, Los Angeles County, CA
CSC-2
San Pedro, Los Angeles County, CA
GI-2a
Crystal Cove, CA
USC-2
Santa Catalina Island, CA
OI-2
San Clemente, Orange County, CA
PTL-2
Point Loma, San Diego, CA
UH-2
Waikiki, HI
UOGML-2
Guam
UDLL-2
Chile
IMAS-2a
Tasmania, Australia
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
07/18/2014
0.26 ± 0.06
nondetect (< 0.05)
nondetect (< 1.10)
3283 ± 6
35.7 ± 4.8
2.69 ± 0.07
2.39 ± 0.21
0.15 ± 0.02
3.05 ± 0.71
07/21/2014
0.19 ± 0.05
nondetect (< 0.04)
n.a. ±
3241 ± 5
4.4 ± 1
0.83 ± 0.05
nondetect (< 0.19)
0.1 ± 0.02
nondetect (< 4.5)
07/20/2014
0.22 ± 0.03
nondetect (< 0.03)
nondetect (< 2.13)
1927 ± 3
53.7 ± 3.6
1.08 ± 0.04
0.12 ± 0.06
0.08 ± 0.01
2.42 ± 0.44
07/24/2014
0.20 ± 0.03
nondetect (< 0.03)
nondetect (< 158)
2462 ± 4
149.3 ± 16.5
2.19 ± 0.05
0.91 ± 0.14
0.37 ± 0.03
8.89 ± 1.07
06/26/2014
0.31 ± 0.05
nondetect (< 0.04)
nondetect (< 1.2)
2135 ± 5
55.7 ± 4.4
0.55 ± 0.04
0.49 ± 0.12
0.08 ± 0.01
9.22 ± 0.69
07/15/2014
0.25 ± 0.05
nondetect (< 0.04)
nondetect (< 0.31)
3314 ± 6
122.3 ± 2.8
2.47 ± 0.06
0.53 ± 0.14
0.25 ± 0.03
4.00 ± 0.51
07/06/2014
0.09 ± 0.05
nondetect (< 0.05)
nondetect (< 0.65)
3899 ± 6
74.1 ± 3.4
1.72 ± 0.06
nondetect (< 0.18)
0.21 ± 0.03
2.71 ± 0.68
07/21/2014
0.23 ± 0.05
nondetect (< 0.04)
nondetect (< 0.56)
3676 ± 6
15.9 ± 2.7
2.18 ± 0.06
0.80 ± 0.16
0.15 ± 0.02
0.75 ± 0.43
07/22/2014
0.22 ± 0.06
nondetect (< 0.05)
nondetect (< 1.13)
4613 ± 7
163.0 ± 4.8
2.60 ± 0.07
1.08 ± 0.23
0.20 ± 0.03
nondetect (< 0.60)
07/22/2014
0.29 ± 0.05
nondetect (< 0.04)
nondetect (< 54)
3737 ± 5
81.9 ± 13.8
1.73 ± 0.05
0.54 ± 0.14
0.16 ± 0.02
1.28 ± 0.71
11/03/2014
0.32 ± 0.05
nondetect (< 0.04)
nondetect (< 0.97)
3941 ± 5
73.6 ± 2.8
1.76 ± 0.05
0.44 ± 0.11
0.15 ± 0.02
4.7 ± 0.5
07/18/2014
0.10 ± 0.06
nondetect (< 0.05)
nondetect (< 12.7)
4607 ± 7
144.8 ± 9.7
1.27 ± 0.06
1.12 ± 0.34
0.18 ± 0.03
nondetect (< 0.91)
07/22/2014
0.14 ± 0.08
nondetect (< 0.06)
nondetect (< 188)
4319 ± 8
20.0 ± 10.7
1.43 ± 0.08
nondetect (< 0.36)
0.13 ± 0.02
2.28 ± 1.49
07/07/2014
0.22 ± 0.03
nondetect (< 0.04)
nondetect (< 200)
3150 ± 4
159.8 ± 21.9
2.68 ± 0.05
2.08 ± 0.16
1.48 ± 0.05
nondetect (< 1.08)
07/22/2014
0.53 ± 0.06
nondetect (< 0.05)
nondetect (< 4.00)
3767 ± 6
19.3 ± 6.4
2.12 ± 0.07
3.36 ± 0.23
0.93 ± 0.06
3.02 ± 0.80
07/16/2014
0.35 ± 0.07
nondetect (< 0.06)
n.a. ±
3900 ± 7
5.2 ± 1.2
0.96 ± 0.06
0.35 ± 0.19
0.29 ± 0.04
nondetect (< 6.0)
07/08/2014
0.32 ± 0.04
nondetect (< 0.04)
nondetect (< 0.87)
2443 ± 4
92.8 ± 3.5
1.74 ± 0.05
0.63 ± 0.16
0.37 ± 0.03
2.62 ± 0.60
07/02/2014
0.30 ± 0.04
nondetect (< 0.03)
nondetect (< 0.93)
2364 ± 4
65.5 ± 3.2
0.92 ± 0.04
0.35 ± 0.09
0.21 ± 0.03
3.12 ± 0.52
07/01/2014
0.37 ± 0.04
nondetect (< 0.03)
nondetect (< 0.87)
2813 ± 4
75.3 ± 3.2
1.53 ± 0.04
0.77 ± 0.13
0.47 ± 0.03
2.47 ± 0.46
07/08/2014
0.28 ± 0.03
nondetect (< 0.03)
nondetect (< 172)
2179 ± 3
195.5 ± 15.9
1.15 ± 0.04
0.60 ± 0.13
0.23 ± 0.02
1.08 ± 0.55
07/19/2014
0.25 ± 0.03
nondetect (< 0.03)
nondetect (< 165)
2035 ± 3
139.7 ± 16.8
2.38 ± 0.04
1.74 ± 0.12
1.11 ± 0.04
0.95 ± 0.41
07/18/2014
0.31 ± 0.03
nondetect (< 0.03)
nondetect (< 201)
1725 ± 3
158.8 ± 15.8
2.75 ± 0.04
2.44 ± 0.12
1.78 ± 0.05
nondetect (< 0.63)
07/21/2014
0.43 ± 0.04
nondetect (< 0.04)
nondetect (< 316)
2636 ± 4
451.7 ± 25
2.04 ± 0.06
0.90 ± 0.18
0.66 ± 0.04
42.4 ± 1.6
07/11/2014
0.30 ± 0.04
nondetect (< 0.03)
6.2 ± 0.6
2567 ± 4
151.3 ± 2.9
0.93 ± 0.04
0.42 ± 0.14
0.16 ± 0.02
nondetect (< 0.46)
07/31/2014
0.26 ± 0.04
nondetect (< 0.03)
nondetect (< 112)
2905 ± 4
176.3 ± 14.7
1.64 ± 0.04
0.85 ± 0.23
0.18 ± 0.02
nondetect (< 0.92)
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
0.37 ± 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
0.40 ± 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)
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
0.36 ± 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)
07/30/2014
0.33 ± 0.04
nondetect (< 0.03)
nondetect (< 29.5)
2305 ± 3
111.8 ± 9.2
1.4 ± 0.04
1.19 ± 0.12
0.46 ± 0.03
nondetect (<1.99)
07/10/2014
0.32 ± 0.04
nondetect (< 0.03)
nondetect (< 8.79)
3144 ± 4
182.7 ± 7.5
1.06 ± 0.04
1.00 ± 0.10
0.27 ± 0.03
1.43 ± 0.81
07/15/2014
0.33 ± 0.04
nondetect (< 0.03)
nondetect (< 1.15)
3197 ± 4
671.8 ± 5.1
1.43 ± 0.05
nondetect (< 0.11)
0.42 ± 0.03
nondetect (< 0.44)
07/07/2014
0.31 ± 0.03
nondetect (< 0.02)
nondetect (< 363)
1580 ± 3
231.5 ± 18.4
0.86 ± 0.03
0.84 ± 0.10
0.24 ± 0.02
nondetect (< 0.81)
07/23/2014
0.37 ± 0.05
nondetect (< 0.04)
0.94 ± 0.29
1912 ± 5
175 ± 2.7
0.98 ± 0.05
0.69 ± 0.15
0.34 ± 0.03
5.60 ± 0.49
07/25/2014
0.17 ± 0.03
nondetect (< 0.03)
nondetect (< 450)
1637 ± 3
370.0 ± 25.7
8.8 ± 0.07
1.16 ± 0.13
0.53 ± 0.04
16.8 ± 1.3
07/10/2014
0.13 ± 0.05
nondetect (< 0.04)
nondetect (< 728)
2800 ± 5
493.2 ± 31.4
3.7 ± 0.06
0.20 ± 0.13
0.31 ± 0.03
20.8 ± 1.6
07/08/2014
0.10 ± 0.04
nondetect (< 0.04)
nondetect (< 0.97)
3383 ± 4
67.7 ± 3.4
3.07 ± 0.06
0.95 ± 0.15
0.16 ± 0.02
1.93 ± 0.49
07/19/2014
0.14 ± 0.03
nondetect (< 0.03)
nondetect (< 4.58)
3412 ± 4
54.8 ± 5.8
2.18 ± 0.05
1.69 ± 0.16
0.44 ± 0.03
2.62 ± 0.62


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 16:30 - updated table format, added multiple sample results
  • 11/13/2014 9:15 - updated multiple "in progress" sample results
  • 12/03/2014 17:15 - updated "Leo-1" and "UH-2" sample results
  • 03/30/2015 10:00 - added HMS-2 and KSMSC-2 sample results