Abstract
The nuclear isomer \(^{121m_2 } Te\) was synthesized at a cyclotron by the (d,2n) reaction and then incorporated into the MgO ceramic. This γ-ray source was stored either at 78 or at 298 K. The measured γ-radiation intensity ratio, R = (Φ573 keV/Φ212 keV), at 78 K appeared to be higher by a factor of 1.0012 ± 0.0002 than at 298 K. The temperature dependence of R is caused by the low-temperature increase in the “constant” λ2 of the \(^{121m_2 } Te \to ^{121m_1 } Te\) decay by the internal conversion mechanism, equal to Δλ2/λ2 = (0.07 ± 0.02)%. The same increase in the decay constant due to induced γ-ray emission, \(^{121m_2 } Te + hv (81.79 keV) \to ^{121m_1 } Te + 2hv (81.79 keV)\), will be reached if both the size of the \(^{121m_2 } Te\) source and the \(^{121m_2 } Te\) concentration in it will be increased by 3 orders of magnitude, i.e., the total \(^{121m_2 } Te\) activity should be increased by 6 orders of magnitude.
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