Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Mimicking the human body with carbon black polymers

13.10.2003


Metal detectors have become so commonplace that you might think we know all we need to about them. However, the law enforcement community must continually update performance standards for metal detectors to ensure that new products purchased in the marketplace operate at specified minimum levels. Further-more, they must know if exposure to the magnetic fields generated by metal detectors affects the functioning of personal medical electronic devices (such as cardiac defibrillators, infusion pumps, spinal cord stimulators, etc.)



With funding from the U.S. Department of Justice’s National Institute of Justice, researchers at the National Institute of Standards and Technology (NIST) develop and revise such standards as new technologies become available. One project concentrated on finding better materials to mimic the human body’s response to the magnetic fields generated by metal detectors. By using such biologic "phantoms," researchers can create more realistic testing scenarios without subjecting medical patients to exposure.

Since about two-thirds of the human body is made of water, conventional phantoms utilize liquids and salts. However, the liquids are subject to evaporation that changes both the salinity and the electrical conductivity, making it difficult to model human body components consistently.


The NIST researchers came up with an improved phantom material, a polymer mixed with carbon powder. By varying the amount of carbon powder used, the materials can mimic blood, bone, fat and skin. The researchers chose carbon black--a fine powder made almost entirely of elemental carbon--because of its electrical conductivity and low cost. The impregnated polymers can be formed in a variety of shapes and sizes. A recent NIST publication* discusses the material and its low-frequency electrical properties in detail.


* NIST Technical Note 1529, Carbon-Loaded Polymer Composites Used as Human Phantoms: Theoretical Models for Predicting Low-Frequency Dielectric Behavior. R.G. Geyer, J. Baker-Jarvis, M.D. Janezic, and R.K. Kaiser.

Gail Porter | EurekAlert!
Further information:
http://www.nist.gov/

More articles from Materials Sciences:

nachricht New design improves performance of flexible wearable electronics
23.06.2017 | North Carolina State University

nachricht Plant inspiration could lead to flexible electronics
22.06.2017 | American Chemical Society

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Quantum thermometer or optical refrigerator?

23.06.2017 | Physics and Astronomy

A 100-year-old physics problem has been solved at EPFL

23.06.2017 | Physics and Astronomy

Equipping form with function

23.06.2017 | Information Technology

VideoLinks
B2B-VideoLinks
More VideoLinks >>>