Radionuclide Decay, Emissions & Therapeutic Radiopharmaceutical QC | Postgraduate Nuclear Medicine

Radionuclide Decay, Emissions & Therapeutic Radiopharmaceutical QC | Postgraduate Nuclear Medicine This lecture provides a comprehensive, concept-based discussion of radionuclide decay, radiation emissions, therapeutic radionuclides, theranostics, and quality control of therapeutic radiopharmaceuticals, designed specifically for postgraduate Nuclear Medicine students and residents. Topics covered 🔹 Nuclear Stability & Decay Nuclear stability and the N–Z relationship Neutron-rich vs proton-rich radionuclides β⁻ decay and isobaric transmutation β⁺ decay and electron capture Q-value and energy conservation 🔹 Beta Radiation Physics Continuous β⁻ and β⁺ energy spectra Endpoint energy and mean beta energy Antineutrino and neutrino energy sharing Positron range and energy loss 🔹 Bremsstrahlung & Radiation Shielding Production of bremsstrahlung X-rays Effect of electron energy and absorber atomic number Low-Z followed by high-Z shielding principle Practical radiation-safety implications for high-energy β emitters 🔹 Gamma Emission & Isomeric Transition Nuclear energy levels Discrete gamma-ray energies Metastable states Isomeric transition Technetium-99m as a clinical example 🔹 Internal Conversion Internal conversion mechanism Conversion-electron energy K-, L- and M-shell conversion Internal conversion coefficient Characteristic X-rays and Auger electrons 🔹 Diagnostic Radionuclides Comparison of: ⁹⁹ᵐTc ¹³¹I ¹⁸F ⁶⁷Ga ¹¹¹In with emphasis on their decay modes, photon emissions and clinical Nuclear Medicine applications. 🔹 Therapeutic Radionuclides ³²P ⁸⁹Sr ⁹⁰Y ¹⁵³Sm ¹⁷⁷Lu ²²³Ra The lecture discusses: β⁻ and α particle therapy Tissue range LET Crossfire effect High-LET alpha radiation Short-range versus millimetre-range radiation Theranostic applications 🔹 Theranostics ¹⁷⁷Lu-based therapy Therapeutic β⁻ emission Accompanying γ emissions Post-therapy SPECT Image-guided therapy and internal dosimetry concepts ⁹⁰Y bremsstrahlung imaging 🔹 Therapeutic Radiopharmaceutical Quality Control A systematic QC framework covering: Radionuclidic purity Parent breakthrough Radiochemical purity (RCP) ITLC and HPLC Chemical purity Trace-metal contamination Radioassay and dose calibrator Particle-size analysis Sterility Bacterial endotoxin testing Biological safety Postgraduate-level clinical reasoning The lecture also includes case-based questions and troubleshooting concepts, encouraging students to move beyond memorization and answer questions such as: • Why should high-energy β emitters not be shielded with lead alone? • Why is the β spectrum continuous? • Why does positron range affect PET resolution? • How does internal conversion differ from gamma emission? • Why does ⁹⁰Y produce a crossfire effect? • Why is alpha therapy highly localized? • What happens when radiochemical purity is low? • Why can a small amount of parent breakthrough be clinically important? • How can trace-metal contamination affect radiolabeling? • How should a therapeutic radiopharmaceutical QC failure be interpreted? Python Simulation Component The lecture is supported by a set of 15 Python-based educational simulations covering nuclear stability, beta spectra, bremsstrahlung, positron physics, PET annihilation, gamma energy levels, internal conversion, therapeutic radionuclides, LET, crossfire, ¹⁷⁷Lu theranostics and radiopharmaceutical QC. These simulations can be used for classroom demonstrations, postgraduate teaching, assignments and self-learning. Who should watch? This lecture is particularly useful for: MD/DNB Nuclear Medicine residents Postgraduate Nuclear Medicine students Nuclear Medicine physicians Medical physicists Radiopharmacists Nuclear Medicine technologists Students preparing for Nuclear Medicine examinations Professionals interested in radionuclide therapy and theranostics Important note The numerical simulations discussed in this lecture are educational models intended to demonstrate physical principles. They should not be used as substitutes for validated clinical dosimetry software, radionuclide transport codes, pharmacopoeial QC procedures, product-specific specifications or regulatory requirements. If you find the lecture useful, Like, Share and Subscribe for more postgraduate-level Nuclear Medicine lectures, physics simulations, radiopharmaceutical science and theranostics content.