3. Situation after the accident

3.1 Radiological situation

The mixture of radioactive products released during the explosion contained mainly relatively short-lived radionuclides, such as ¹⁴⁴ Ce, ¹⁴⁴ Pr, ⁹⁵ Zr, ⁹⁵ Nb.

However, the greatest radiological hazard long after the accident is represented by long-lived ⁹⁰ Sr (2.7% of the initial total activity), on a par with its descendant ⁹⁰ Y. The half-life of ⁹⁰ Sr (T _1/2 = 28 years)...