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Photonic radiation sensors can withstand large doses



NIST photonic prototype thermometer. Credit: Jennifer Lauren Lee / NIST

Researchers at the National Institute of Standards and Technologies (NIST) have clearly demonstrated projection classes and major medical, industrial and research applications in radial sensors classes for high-radiation environments.


The photonic sensor transmits light to the electrical current instead of the electrical current. They can be measured, transmitted and handled by photon currents, usually through optic fibers, which are used to measure pressure, temperature, distance, magnetic fields, environmental conditions, and more.

Its small size, such as low energy consumption and tolerance of environmental variables, such as mechanical vibration. But the general consensus that high levels of radiation would change the optical properties of the silicon, resulting in erroneous readings.

Thus, NIST, the leading world leader in photonic research fields, has launched a series of responses to these questions. According to the test results, the sensors can be customized to measure radiation doses for radiologically applied radiation. The results of the first round of the test were reported Natural science reports.

Specifically, the results of the NIST suggest that sensors can use ionizing radiation levels (high enough energy to be used for irradiation of foodstuffs) to destroy microbes and sterilize in a medical device ($ 7 million a year market) only in the US. The sensors have potential imagery and medical therapy applications, and by 2022 around the world around 50 million dollars will be screened annually.

"If you look at issues related to the issue, different laboratories were achieving different results," said the Zeeshan Ahmed project scientist, the NIST Photodynamic Photonics Project and the NIST Thermometer Photonics Project. "That was the main motivation for our experiment."

"Another motivation was that the photon sensors are very close to working in very harsh environments, such as nuclear reactors, because radiation damage is the main concern," said Ahmed. "Also, the spatial industry needs to know how these devices work on radioactive radiation," said Ronald Tosh, a scientist of the project. "Would they condemn or not? What shows this study for a particular device and radiation, the damage is indifferent."

The photon sensors that appear in the image transmit light information instead of electrical currents. Recently, NIST scientists have shown that radiation causes the performance of these sensors. In this configuration, scientists have put a photon sensor under the powerful force of electromagnetic radiation. Beam crosses an axis and hits a closed-stop source that can be closed or can be opened by beam. When he sees the beam chip, he shines. Next to the control room, physicists control how manipulated beam and chip control are being controlled. Scientists use some of these patterns to use them as a sensor in high-radiation areas, such as space or equipment used for medical imaging or cancer therapies. Credit: Jennifer Lauren Lee / NIST. Music Credit: "The Messenger", Silent Partner.

"We found that oxidized silicon photon devices can withstand 1 million gray radioactive exposure," said Ryan Fitzgerald, Director of the Photonic Dosimetry Project, using the X-ray absorption unit. Gray indicates a kilogram energy absorbed joule, and 1 gray 10,000 chest X-rays. It would be a sensor in a nuclear power plant.

"Our calibration customers are the top limit of what they care for," said Fitzgerald. "Devices can work reliably at industrial or medical radiation hundreds or thousands of times below." Eating radiation, for example, passes through hundreds of thousands of gray, and usually affects alanine piles, ammonia, changes its atomic properties in ionizing radiation.

To determine the effects of radiation, the NIST researchers underwent two silicon photon-type sensors radiation from 60 hours of radiation from an isotope radiation. In two types of sensors, the slight variation in physical properties changes the wavelength of light. By measuring changes, devices can be used as highly sensitive thermometers or voltage gauges. This is still true in extreme atmospheres such as space flights or nuclear reactors, if ionizing radiations continue to function properly under exposure.

"Our findings demonstrate that these photonic devices are also very strong in radioactive radiation and can also be used to measure radiation over radiofrequency physical properties," said Fitzgerald. "It has to be a good news for US manufacturing, with large and growing markets that will be able to offer very long-range radiation, photon sensors could be used to measure low-energy electric energy and X-ray beams in sterilization and nutrition radiation in medical devices."

Clinical medicine will also be of great interest to physicians. Therefore, they will try to treat doctors and other conditions in the smallest dimension in the most effective radiation levels, so they can affect healthy tissues in electrons, protons and ion beams. The radiation sensors to reach this goal have extensive experience with sensitivity and spatial resolution. "In the end, we expect the development of manual devices in sheets, for industrial and medical applications, to determine the distances measured in the micrometers, and in unprecedented measurement of measurements," said scientist Nikolai Klimov. A micrometer is one million million. Human hair is 100 microns wide.

The results of the group are used for new medical treatments or prostheses or carbon ions and sterilization medical processes in low energy electric beams. "Our sensors are naturally small and chip scales," said Fitzgerald. "The current dosimeters are in millimeters and centimeters, and the readings that can vary according to these dimensions are incorrect".

In the next phase of the research, the team will analyze the sensor matrix simultaneously in the same conditions, in order to solve dosage changes in small distances.


Explore more:
Hall effect magnetic field sensors for high temperatures and harmful radiation environments

More information:
Zeeshan Ahmed et al., Photonic Silicon Radiation to assess the hardness of the sensors, Scientific reports (2018). DOI: 10.1038 / s41598-018-31286-9

Magazine reference:
Scientific reports

Given:
National Institute of Standards and Technologies


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