This inventor holds 6 USPTO granted patents. Top assignees: The United States of America as Represented by the United States, British Nuclear Fuels Plc, Martin Marietta Energy Systems, Inc.. Active years: 1981-2004.
Company Filing History:
3 out of 3,975 
1 out of 291 
1 out of 266 
Years Active: 1981-2004
Title: John T Caldwell: Innovator in Radiation Detection and Analysis
Introduction
John T Caldwell is a notable inventor based in Los Alamos, NM (US). He has made significant contributions to the field of radiation detection and analysis, holding a total of 6 patents. His work has focused on developing techniques that enhance the accuracy of isotopic analysis and improve safety measures in detecting hidden explosives.
Latest Patents
Caldwell's latest patents include innovative methods for analyzing materials containing radioactive sources. One of his inventions provides a technique for correcting gamma ray intensities detected to account for variation in attenuation effects with energy. This advancement enables more accurate isotopic analysis, particularly in low-level emission cases. The technique is especially useful for investigating waste materials with gamma-emitting content that needs to be determined. The attenuation is corrected using a bi-modal function to account for the effects arising from low and high atomic mass components of the material.
Another significant patent is a hidden explosives detector employing pulsed neutron and X-ray technology. This invention focuses on detecting small amounts of modern, highly-explosive nitrogen-based explosives, such as plastic explosives, hidden in airline baggage. Caldwell's system employs several techniques, including X-ray imaging and interrogation with a pulsed neutron source, to create images of nitrogen and oxygen densities. Additionally, neutron interrogation is used to form a hydrogen density image or three-dimensional map, enhancing the detection capabilities of the system.
Career Highlights
Throughout his career, John T Caldwell has worked with prominent organizations, including the United States of America as represented by the United States and British Nuclear Fuels Plc. His expertise in radiation detection has positioned him as a key figure in the development of safety technologies.
Collaborations
Caldwell has collaborated with notable individuals in his field, including Walter E Kunz and Stephanie Ann Jones. Their combined efforts have contributed to advancements in radiation analysis and detection technologies.
Conclusion
John T Caldwell's innovative work in radiation detection and analysis has led to significant advancements in safety and accuracy. His contributions continue to impact the fields of nuclear science and security.