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About Us



Sietronics was established in 1978 and since then has been serving the X-Ray community in Australia and around the world. With over 60 years of combined experience in the XRD and XRF fields, Sietronics has the expertise to support any XRF or XRD application.


Sietronics also runs a commercial XRD lab processing a large range of sample type, including mining and mineral samples, cements, soils and clays as well as manufactured materials, all using Siroquant software.

John Ness



John Ness Director

John has extensive business experience have been a director of several companies over the years.

John has founded several companies including Mitec and EM Solutions, and was awarded the prestigious Clunies Ross Award by the Academy of Technological Scientists and Engineers in 2010 for excellence in innovation

Luis The

Managing Director


Luis Thé Managing Director

Luis was born in Brazil, and lived in Canada before moving to Australia in the early 1990’s. He has an honours degree in Electrical Engineering from Uni Queensland, and worked in various engineering, sales, project and engineering management and strategic planning roles in Australia and Canada.

He joined Sietronics in 2007 and oversees all day-to-day operations of the company.

Terrence Desilva

Business Development Manager


Terrence DeSilva Business Development Manager

Terrence was born in Sri Lanka where he received a degree in Engineering before moving to Australia. He has a wide range of experience, from project coordination manager through to engineering, university instructor and sales. 

Terrence began with Sietronics in February 2004 as the service manager back when we serviced large xrd / xrf instruments. His engineering background in the role helped enormously. When the service department closed he moved to sales specialising in Siroquant and oil analysis products.

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