• Mayeen Uddin Khandaker

      Articles written in Pramana – Journal of Physics

    • Production parameters of the therapeutic 105Rh radionuclide using medium energy cyclotron

      Mayeen Uddin Khandaker Kwangsoo Kim Guinyun Kim

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      Production cross-sections of the therapeutic 105Rh radionuclide from proton-induced reactions on natural palladium target were measured using stacked-foil activation technique combined with high resolution 𝛾-ray spectrometry at the MC50 cyclotron of the Korea Institute of Radiological and Medical Sciences. Note that cyclotron production of the 105Rh radionuclide from natural palladium target was measured here for the first time. Results are compared with the theoretical values obtained using the model codes TALYS and ALICE-IPPE. Thick target integral yields for the investigated 105Rh radionuclide were deduced from the threshold energy to 40 MeV. Measured data of the 105Rh radionuclide are important because of its potential applications in nuclear medicine and/or therapeutic purposes. Optimal production circumstances for the therapeutic 105Rh radionuclide using a cyclotron are discussed elaborately.

    • Efficiency calibration of $\gamma$-ray detector for extended sources

      ANIMESH KUMER CHAKRABORTY MD SHUZA UDDIN MD ASAD SHARIFF SHAIKH ABDUL LATIF MD ABDUR RASHID MAYEEN UDDIN KHANDAKER

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      Precise identification and quantification of radioisotope in a sample largely depend on the accuracy of the full-energy peak efficiency of the detector. It is generally observed that the efficiency for a given energy of point-like sources is not the same as the extended source. However, number of correction factors such as detector geometry, photon attenuation, coincidence-summing, etc. may reduce such a difference in efficiency regardless of sources, or they should be considered in the measurement of extended samples. In connection to this, the variation of absolute photopeak efficiency of a high-purity germanium (HPGe) detector with the distances from the surface of the detector as well as with the γ-ray energies were investigated using $\gamma$-ray standard point sources. We present a method to determine the loss of efficiencies in radioactivity measurement of the thin extended radioactive disc samples in comparison to point source.

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