Articles Related to MSS
Comparative Simulation Study of Direct and Indirect Target Production of 99Mo with Linear Accelerator at SAMEER
When high energy electron beam falls on a high Z target it generates bremsstrahlung photons which can be used to produce 99Mo from 100Mo using photo-neutron (γ, n) reaction. Two different approaches are studied to carry out photo-neutron reaction. First, a converter target approach in which photons are generated in a high Z target of tungsten using (e,γ) reaction and then (γ, n) reaction in 100Mo for 99Mo production. Second, a direct target approach wherein 30 MeV electrons hit directly onto 100Mo target to carry out both (e, γ) and (γ, n) reactions in the 100Mo target itself. GEANT4 simulation gives photons and neutrons fluxes and their angular distributions from both the approaches, which are then used to calculate activity of 99Mo. The study shows that for very thin 100Mo target of about 0.1 radiation length converter target shows better activity whereas, for any thickness beyond it the direct target approach is found to be more efficient. For 30 MeV and 10 kW beam falling on 100Mo target with 1.4 radiation length, direct target approach is found to be more efficient. Therefore, after improvising the geometry of 100Mo target in the case of direct target method an increased specific activity is obtained through GEANT4 simulation.
Parry-Romberg syndrome is a rare disorder characterized by slowly progressive deterioration of the skin and soft tissues of half of the face. The syndrome presents with characteristic skeletal, dental, and soft tissue changes in the affected half of the face, with or without neurological signs and symptoms.
The DNA mismatch repair (MMR) system is necessary for the maintenance of genomic stability. The MMR system promotes genomic fidelity by repairing base-base mismatches, insertion-deletion loops (IDLs) and heterologies generated during DNA replication and recombination.