See at the production of S-35.

8.6.4 Potassium Isotopes

K-38: produced in 35Cl(a, n)38K nuclear reaction, t1/2 = 7.6 min, emits (3+ particles. K-42: see at the production of S-35.

8.6.5 Calcium-45

45Ca can be produced in the 44Ca(n,^)45Ca reaction. Its half-life is 163 days, and it emits (3_ particles, similar to C-14 and S-35. 45Ca is mostly applied in biological research.

8.6.6 Chromium-51 (Cr-51)

Cr-51 can be produced in the 50Cr(n, Y)51Cr nuclear reaction, half-life is 27.7 days, and it emits (3_ and gamma radiation. 51Cr isotope is applied in biological and med­ical research in the so-called chromium release assay studies. This method is based on the adsorption of Cr-51 on the cell walls. For additional information, see Section 8.7.1.1.