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Table 1 Radioisotopes, half-lives and gamma-ray energies used

From: Evaluate of heavy metal concentration in shrimp (Penaeus semisulcatus) and crab (Portunus pelagicus) with INAA method

Isotope	Half-life	Gamma-ray energies (keV)
⁵⁶Mn	155 min	846.76, 1810.72
⁵⁹Fe	44.5 d	1099.25, 1291.60
⁶⁰Co	5.27 y	1173.2, 1332.50
⁷⁶As	1.10 d	559.10
⁶⁵Zn	243.9 d	1115.55
^69mZn	825.6 min	438.63
^71mZn	236.4 min	386.28

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