Related Experiment Video
Updated: May 24, 2026

Preparation and Evaluation of 99mTc-labeled Tridentate Chelates for Pre-targeting Using Bioorthogonal Chemistry
Published on: February 4, 2017
Standardization of (99m)Tc by means of a software coincidence system
A B Brito1, M F Koskinas, F Litvak
1Instituto de Pesquisas Energéticas e Nucleares IPEN-CNEN/SP, Centro do Reator de Pesquisas-CRPq, C.P. 11049, Pinheiros, 05422-970, São Paulo, SP, Brazil.
Abstract:
The procedure followed by the Nuclear Metrology Laboratory, at IPEN, for the primary standardization of (99m)Tc is described. The primary standardization has been accomplished by the coincidence method. The beta channel efficiency was varied by electronic discrimination using a software coincidence counting system. Two windows were selected for the gamma channel: one at 140 keV gamma-ray and the other at 20 keV X-ray total absorption peaks. The experimental extrapolation curves were compared with Monte Carlo simulations by means of code ESQUEMA.
Related Concept Videos
Imaging Studies II: Positron Emission Tomography and Scintigraphy
Fundamental Principles of PET
Computed Tomography
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT
Tandem Mass Spectrometry
