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This study explores the suitability of semi-insulating compounds,specifically (Cd,Mn)Te and (Cd,Mn)(Te,Se), as materials for room temperatureX-ray and gamma-ray detectors. These compounds were grown using the Bridgmanmethod, known for its efficient growth rate. The investigation aims to comparetheir crystal structure, mechanical properties, optical characteristics, andradiation detection capabilities. The addition of selenium to (Cd,Mn)Teincreased the compound's hardness. However, (Cd,Mn)(Te,Se) exhibited one orderof magnitude higher etch pit density compared to (Cd,Mn)Te. Photoluminescenceanalysis at low temperatures revealed the presence of defect states in bothmaterials, characterized by shallow and deep donor-acceptor pair transitions(DAP). Annealing in cadmium vapors effectively eliminated DAP luminescence in(Cd,Mn)Te but not in (Cd,Mn)(Te,Se). Spectroscopic performance assessmentsindicated that the (Cd,Mn)Te detector outperformed the (Cd,Mn)(Te,Se) detectorin responding to a Co-57 source. The reduced performance in the latter case maybe attributed to either the presence of a deep trap related to deep DAPluminescence, minimally affected by annealing, or the dominant presence ofblock-like structures in the samples, as indicated by X-ray diffractionmeasurements. The block-like structures in (Cd,Mn)(Te,Se) showed ten timeslarger misorientation angles compared to the (Cd,Mn)Te crystals. (Cd,Mn)Tecrystal revealed excellent single crystal properties, demonstrated by narroweromega scan widths. The study also highlights the influence of grain boundariesand twins on crystal structure quality. In our opinion, Bridgman-grown(Cd,Mn)Te shows greater promise as a material for X-ray and gamma-ray detectorscompared to (Cd,Mn)(Te,Se).

Bridgman-grown (Cd,Mn)Te and (Cd,Mn)(Te,Se): A comparison of suitability for X and gamma detectors