. Author manuscript; available in PMC: 2015 May 2.

Published in final edited form as: J Chromatogr A. 2014 Mar 16;1340:109–114. doi: 10.1016/j.chroma.2014.03.033

Table 2.

Evaluated sodium, arsenic, and selenium isotopes and their associated gammas [28].

Isotope	Half-Life	Gamma Emissions (Abundances)	Specific Activity
²²Na	2.6027 a	511 (180%), 1274.5 keV (99.9%)	1.65 MBq/mg (4.5 × 10⁻⁵ Ci/mg)^*
⁷²As	26.0 h	511 (176%), 834.0 keV (81.0%)	nca (6.18 GBq/mg; 1670 Ci/mg)
⁷³As	80.30 d	53.4 keV (10.3%)	nca (825 MBq/mg; 22.3 Ci/mg)
⁷⁴As	17.77 d	511 (58%), 595.8 keV (59.0%)	nca (3.67 GBq/mg; 99.3 Ci/mg)
⁷⁶As	26.3 h	559.1 keV (45.0%)	5.74 MBq/mg (0.155 mCi/mg) at EOB^*
⁷²Se	8.4 d	45.89 keV (57.2%)	nca (7.99 GBq/mg; 216 Ci/mg)
⁷⁵Se	119.78 d	121 (17%), 136.0 keV (58.3%) 264 (59%), 279 (25%), 400 (11%)	nca in LANL sample 9.36 MBq/mg (0.253 Ci/mg)^*

nca = no carrier added; specific activities calculated.

Specific activities determined from target mass irradiated.