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About LEMA

The Accelerator Mass Spectrometry Laboratory (LEMA by its name in Spanish) of the Institute of Physics, is a National Laboratory where we carry out basic, applied and interdisciplinary research projects based on the determination of very low concentrations of radionuclides such as 14C, 10Be, 26Al, 129I and Pu.

LEMA provides radiocarbon analyses/dating services, and has been granted its ISO 9001:2015 testing certification by the International Management and Evaluation Society (SIGE) in April 2018, for radiocarbon dating.

Quality Policy of the Physics Institute Laboratories:

Institute of Physics Laboratories Quality Policy: The Institute of Physics is committed to promote quality in the various tasks it carries out, such as research in physics and related areas, human resource training, diffusion of knowledge generated and linkage with other areas.

In particular, laboratories of the institute have a commitment to provide good quality services issuing reliable, truthful and traceable results, with authorized testing methods, with the appropriate measuring equipment, verified and/or continuously calibrated on the basis of the International standards ISO9001:2015-quality management systems, and the ISO17025: 2017 standard "General Requirements for the competence of the testing laboratories and calibration", and thus consistently know about the needs and expectations of our customers, and accomplish them with quality, safety, legality and objectivity.

UNAM Quality Certification
Mailbox of complaints, suggestions and comments about LEMA services: calidad@fisica.unam.mx

Our History

The Accelerator Mass Spectrometry Laboratory (LEMA) is a facility of the Institute of Physics at UNAM (IF-UNAM). It was created after a group of researchers from the Department of Experimental Physics led by Dr. Corina Solis, Dr. Efrain Chavez and Dr. Maria Esther Ortiz submitted a project for financing to the National Council for Science and Technology (CONACYT) in 2009. 
LEMA includes three laboratories for sample preparation and a hall with the AMS system based in a 1 MV accelerator, manufactured by High Voltage Engineering Europe. The accelerator and the two mass spectrometers, which make up the Isotopic Separator, heart of the LEMA, arrived at the end of February 2013 and its mechanical installation concluded at the end of March, the acceptance tests for the measurements according to the specifications contracted for the isotopes of: 10Be, 14C, 26Al, 129I and 239,240,242Pu, were successfully concluded at the beginning of June 2013.

Legal Nature

The Accelerator Mass Spectrometry Laboratory is part of the facilities of the Institute of Physics which is an academic unit of the Universidad Nacional Autonoma de Mexico (UNAM) in accordance with Article 9 of the Statute General of the UNAM.


LEMA is located inside the Institute of Physics in the Exterior Circuit of the University Campus UNAM in Mexico City. 

2019 Institute of Physics UNAM | Circuito de la Investigacion Cientifica Ciudad Universitaria CP 04510 Mexico, D.F.