جستجوی مقالات مرتبط با کلیدواژه "99mtc" در نشریات گروه "فیزیک"

Ionizing radiation collides with biological systems, inflicting ionization and excitation of atoms and molecules, developing abnormal and harmful products with inside the biological environment. Estimation of absorption dose is of particular significance in evaluating the medical and biological effects related to ionizing radiation from radiopharmaceuticals. Therefore, the aim of this study was to evaluate the absorbed dose of human body organs resulting from the novel 99mTc-MAX labeled compound based on studies of the biodistribution of balb/c mice. The designed ligand with chelating properties was synthesized by the reaction between the two substances Chloroacetamide and Xanthate with certain molar ratios. Then, the labeling process was performed successfully with 99mTc and with 93% radiochemical purity in the laboratory and 90% in the presence of human blood serum. The biodistribution of the labeled complex in balb/c mice up to 24 hours after injection was then examined. MIRD method was used to estimate the absorbed dose in human organs. The results indicate the highest absorbed dose of the complex in the liver with 0.0011mGy / MBq. The 99mTc-MAX can be a potentially effective imaging agent due to its significant hepatic uptake as well as its proper accumulation in the reticuloendothelial system.

In the last three decades, 99mTc-MDP and 99mTc-HEDP have been used as diagnostic radiopharmaceuticals for bone imaging agents. The radioisotope Department after many investigations decided to develop the synthesis of a biphosphonate derivative, named 1-hydroxy-ethylidene-1, 1-disodium phosphonate (HEDP). In this article, we discuss the method of synthesis, formulation, and labeling of lyophilised kit with 99mTc. The results show that our kit has a high radiochemical purity (>95%), according to the US pharmacopeia. In addition, the stability of lyophilised HEDP kit is more than one year at 4-8oC.