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Table RD-18.  Activity Concentrations of Radionuclides Measured by Alpha Spectroscopy
in Red Bluff Reservoir Sediment Samples Collected during 1998 – 2000

See CEMRC 2000 Report "Radiological and non-radiological constituents in surface water and sediments at selected reservoirs"
for descriptions of locations and methods of data collection.
Download pdf file


Isotope Collection Date and Sampling Depth
March 3, 1998 (15 m depth) March 10, 1998 (14 m depth)
Activity Concentration
(mBq g-1)		 aSD
(mBq g-1)		 bMDC
(mBq g-1)		 Activity Concentration
(mBq g-1)		 SD
(mBq g-1)		 MDC
(mBq g-1)
241Am 5.28E-02 9.76E-03 1.79E-02 1.81E-01 1.81E-02 1.92E-02
238Pu <MDC

 

 1.79E-02 2.46E-02 6.48E-03 1.73E-02
239/240Pu 1.49E-01 1.32E-02 1.98E-02 3.89E-01 2.15E-02 1.41E-02
228Th 2.45E+01 6.14E-01 2.43E-01 3.49E+01 7.86E-01 2.45E-01
230Th 2.65E+01 6.44E-01 1.95E-01 3.35E+01 7.65E-01 2.30E-01
232Th 2.18E+01 5.70E-01 1.71E-01 2.90E+01 6.96E-01 1.64E-01
234U 4.87E+01 9.43E-01 1.97E-01 1.02E+02 1.70E+00 1.70E-01
235U 2.19E+00 2.17E-01 2.00E-01 3.56E+00 3.01E-01 1.66E-01
238U 3.35E+01 7.35E-01 1.76E-01 6.09E+01 1.15E+00 1.73E-01
Isotope March 10, 1998 (14 m depth) March 10, 1998 (12 m depth)
Activity Concentration
(mBq g-1)		 SD
(mBq g-1)		 MDC
(mBq g-1)		 Activity Concentration
(mBq g-1)		 SD
(mBq g-1)		 MDC
(mBq g-1)
241Am 1.49E-01 1.86E-02 2.08E-02 5.86E-02 7.86E-03 1.10E-02
238Pu <MDC

 

 2.31E-02 <MDC

 

 3.30E-02
239/240Pu 3.35E-01 1.94E-02 1.36E-02 1.99E-01 1.61E-02 1.47E-02
228Th 3.55E+01 7.83E-01 2.63E-01 2.44E+01 6.14E-01 2.31E-01
230Th 3.40E+01 7.61E-01 2.16E-01 2.70E+01 6.54E-01 2.18E-01
232Th 2.75E+01 6.62E-01 1.40E-01 2.38E+01 6.01E-01 1.79E-01
234U 8.04E+01 1.88E+00 2.67E-01 4.35E+01 1.23E+00 2.51E-01
235U 2.73E+00 3.19E-01 2.78E-01 1.97E+00 2.68E-01 2.42E-01
238U 5.15E+01 1.36E+00 2.41E-01 2.99E+01 9.63E-01 2.20E-01
Isotope October 14, 1998 (10 m depth) October 14, 1998 (10 m depth)
Activity Concentration
(mBq g-1)		 SD
(mBq g-1)		 MDC
(mBq g-1)		 Activity Concentration
(mBq g-1)		 SD
(mBq g-1)		 MDC
(mBq g-1)
241Am 1.11E-01 1.07E-02 1.43E-02 1.43E-01 1.17E-02 1.28E-02
238Pu 2.83E-02 6.15E-03 1.30E-02 2.98E-02 7.04E-03 1.98E-02
239/240Pu 3.21E-01 1.89E-02 1.08E-02 3.93E-01 2.10E-02 1.41E-02
228Th 2.91E+01 8.99E-01 3.96E-01 3.37E+01 9.31E-01 3.92E-01
230Th 2.96E+01 9.06E-01 3.45E-01 3.43E+01 9.37E-01 3.01E-01
232Th 2.36E+01 7.95E-01 2.29E-01 2.71E+01 8.14E-01 1.82E-01
234U 7.71E+01 1.89E+00 2.64E-01 9.55E+01 2.19E+00 2.72E-01
235U 3.80E+00 4.00E-01 2.81E-01 4.00E+00 4.12E-01 2.92E-01
238U 4.68E+01 1.33E+00 3.17E-01 5.65E+01 1.49E+00 2.56E-01
Isotope October 14, 1998 (10 m depth) October 14, 1998 (10 m depth)
Activity Concentration
(mBq g-1)		 SD
(mBq g-1)		 MDC
(mBq g-1)		 Activity Concentration
(mBq g-1)		 SD
(mBq g-1)		 MDC
(mBq g-1)
241Am 1.53E-01 1.43E-02 1.44E-02 1.37E-01 1.17E-02 1.17E-02
238Pu 3.98E-02 7.23E-03 1.60E-02 2.91E-02 5.88E-03 1.22E-02
239/240Pu 4.35E-01 2.17E-02 1.51E-02 4.13E-01 2.10E-02 1.62E-02
228Th 3.57E+01 9.60E-01 3.52E-01 1.01E+02 2.74E+00 3.21E-01
230Th 3.17E+01 8.92E-01 3.06E-01 6.15E+01 1.90E+00 2.92E-01
232Th 2.69E+01 8.10E-01 2.29E-01 3.30E+00 4.24E-01 3.42E-01
234U 1.02E+02 2.33E+00 3.05E-01 3.06E+01 8.88E-01 3.51E-01
235U 4.44E+00 4.38E-01 2.65E-01 2.62E+01 8.06E-01 2.31E-01
238U 5.95E+01 1.56E+00 2.79E-01 3.02E+01 8.78E-01 2.89E-01
Isotope July 27, 1999 (10 m depth) July 27, 1999 (13 m depth)
Activity Concentration
(mBq g-1)		 SD
(mBq g-1)		 MDC
(mBq g-1)		 Activity Concentration
(mBq g-1)		 SD
(mBq g-1)		 MDC
(mBq g-1)
241Am 1.10E-01 1.46E-02 2.48E-02 1.22E-01 1.78E-02 3.21E-02
238Pu 2.14E-02 6.70E-03 1.81E-02 1.93E-02 6.23E-03 1.77E-02
239/240Pu 2.97E-01 2.04E-02 1.82E-02 4.06E-01 2.31E-02 1.25E-02
228Th 2.91E+01 8.06E-01 4.11E-01 3.39E+01 7.67E-01 2.63E-01
230Th 2.59E+01 1.03E+00 4.91E-01 3.38E+01 7.63E-01 2.32E-01
232Th 3.19E+01 1.16E+00 5.27E-01 2.88E+01 6.86E-01 1.40E-01
234U 6.38E+01 1.22E+00 2.08E-01 9.20E+01 1.56E+00 1.93E-01
235U 3.27E+00 2.93E-01 2.15E-01 3.67E+00 3.08E-01 1.79E-01
238U 4.33E+01 9.32E-01 2.53E-01 5.49E+01 1.07E+00 1.67E-01
Isotope July 27, 1999 (14 m depth) July 27, 1999 (13 m depth)
Activity Concentration
(mBq g-1)		 SD
(mBq g-1)		 MDC
(mBq g-1)		 Activity Concentration
(mBq g-1)		 SD
(mBq g-1)		 MDC
(mBq g-1)
241Am 1.42E-01 1.79E-02 2.42E-02 1.40E-01 1.18E-02 1.53E-02
238Pu <MDC

 

 2.76E-02 1.70E-02 5.84E-03 1.59E-02
239/240Pu 3.75E-01 2.48E-02 2.28E-02 3.91E-01 2.34E-02 1.73E-02
228Th 3.66E+01 8.15E-01 2.41E-01 3.44E+01 8.97E-01 3.46E-01
230Th 3.39E+01 7.75E-01 2.31E-01 3.38E+01 8.85E-01 2.54E-01
232Th 2.89E+01 6.98E-01 2.10E-01 2.64E+01 7.63E-01 2.10E-01
234U 9.70E+01 1.68E+00 2.71E-01 9.55E+01 1.64E+00 1.55E-01
235U 3.21E+00 2.90E-01 2.35E-01 3.44E+00 3.00E-01 2.16E-01
238U 5.84E+01 1.15E+00 2.61E-01

5.78E+01

 1.13E+00 1.85E-01
Isotope May 22, 2000 (13 m depth) May 22, 2000 (12 m depth)
Activity Concentration
(mBq g-1)		 SD
(mBq g-1)		 MDC
(mBq g-1)		 Activity Concentration
(mBq g-1)		 SD
(mBq g-1)		 MDC
(mBq g-1)
241Am 1.25E-01 1.09E-02 1.14E-02 1.15E-01 1.10E-02 1.33E-02
238Pu <MDC

 

 1.71E-02 2.09E-02 5.69E-03 1.49E-02
239/240Pu 3.82E-01 2.03E-02 1.43E-02 3.04E-01 1.76E-02 1.38E-02
228Th 6.15E+01 2.02E+00 4.07E-01 3.54E+01 9.81E-01 2.87E-01
230Th 2.74E+01 8.27E-01 2.58E-01 3.09E+01 9.04E-01 2.17E-01
232Th 3.41E+01 9.44E-01 3.97E-01 3.65E+01 1.00E+00 4.78E-01
234U 3.41E+01 9.42E-01 3.07E-01 8.47E+01 2.38E+00 4.38E-01
235U 1.05E+02 3.01E+00 3.44E-01 3.34E+00 4.55E-01 4.05E-01
238U 4.86E+00 5.63E-01 3.73E-01 5.47E+01 1.77E+00 4.24E-01

 

 

Isotope		 May 22, 2000 (13 m depth) May 22, 2000 (12 m depth)
Activity Concentration
(mBq g-1)		 SD
(mBq g-1)		 MDC
(mBq g-1)		 Activity Concentration
(mBq g-1)		 SD
(mBq g-1)		 MDC
(mBq g-1)
241Am 1.37E-01 1.18E-02 1.36E-02 1.54E-01 1.25E-02 1.42E-02
238Pu 2.85E-02 6.05E-03 1.39E-02 <MDC

 

 2.09E-02
239/240Pu 3.82E-01 1.97E-02 1.22E-02 4.15E-01 2.13E-02 1.17E-02
228Th 3.19E+01 7.98E-01 2.51E-01 3.66E+01 9.05E-01 3.25E-01
230Th 2.62E+01 7.08E-01 1.74E-01 3.55E+01 8.87E-01 2.90E-01
232Th 3.33E+01 8.22E-01 3.38E-01 2.77E+01 7.62E-01 1.72E-01
234U 1.01E+02 2.90E+00 2.71E-01 1.05E+02 3.04E+00 3.60E-01
235U 3.96E+00 4.97E-01 3.73E-01 4.31E+00 5.28E-01 3.93E-01
238U 5.83E+01 1.93E+00 3.13E-01 5.93E+01 1.99E+00 3.40E-01
aSD=One standard deviation of the radioanalytical uncertainty
bMDC=Minimum Detectable Concentration