Uranium in the Surrounding of San Marcos-Sacramento River Environment (Chihuahua, Mexico)

Table 9

Activity concentrations of ²³⁸U and ²³⁴U isotopes and their uncertainties (in parenthesis) and AR (²³⁴U/²³⁸U) for fish samples from San Marcos Dam. Samples were collected in 2005.

Sample	^238U (Bq/kg)	^234U (Bq/Kg)	^234U/^238U
F1	1.0±0.2	2.0±0.3	2.1±0.5
F2	1.6±0.2	2.6±0.2	1.6±0.2
F3	1.9±0.3	1.7±0.3	0.9±0.2
F4	1.5±0.1	2.7±0.1	1.8±0.1
F5	1.1±0.1	1.8±0.1	1.7±0.2
F6	2.6±0.2	4.5±0.2	1.7±0.1
F8	0.5±0.1	1.4±0.1	2.9±0.6
F9	0.6±0.1	1.2±0.1	2.1±0.4
F10	0.5±0.1	1.6±0.1	3.5±0.7
F12	0.14±0.06	0.6±0.1	4.5±2.1
F13	1.5±0.1	2.0±0.1	1.3±0.1
F15	1.0±0.1	2.1±0.2	2.1±0.3
F16	0.5±0.1	2.0±0.3	3.7±0.9