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Carbon material dosimeter

A technology of sensing material and carbon fiber board, applied in the field of detection devices, can solve problems such as limitation and threshold voltage change

Inactive Publication Date: 2010-11-10
约翰·T·W·姚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These disadvantages limit its application in in vivo dosimetry
[0004] Disadvantages of TLDs include: sensitivity to environmental conditions, process flow, and heating conditions
However, changes in temperature also produce changes in the threshold voltage

Method used

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  • Carbon material dosimeter
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Examples

Experimental program
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Embodiment Construction

[0045] The dosimeter includes one or more individual carbon-based sensing components. Each sensing component can operate independently as a radiation sensor. The sensing component is based on one of a variety of different carbon-based materials, which may be semiconducting or non-semiconducting, including but not limited to carbon fiber sheets, carbon fiber films, carbon plates, carbon nanoparticles, carbon films , or carbon nanotube film. One of the advantages of the present invention is that the carbon material used to make the sensing element can be used in its original state and does not have to be mixed with another substance such as a polymer. In this way, the sensing element of the present invention can be manufactured at a much cheaper cost than other sensing elements comprising composite materials.

[0046]There are many ways to manufacture such carbon dosimeters. The manufacturing method of the dosimeter is more specifically as follows: (i) When using a carbon fib...

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Abstract

Radiation dosimeters that are based on carbon materials such as carbon powder, carbon fibers, carbon nanoparticles and carbon nanotubes are developed. The dosimeter may contain a singular element or multiple sensing elements that are arrayed in 1-D, 2-D and 3-D formations. Each sensing element is made up of two electrodes with carbon materials deposited between the electrodes. The sensing elements may be deposited on flexible substrates to create flexible dosimeters. In addition, the carbon sensing materials may be deposited onto transparent substrates to achieve a transparent dosimeter. Transparent and / or flexible dosimeters can be fabricated with the carbon materials. The sensing elements are connected to external power sources. As the elements are exposed to radiation beams, the change in resistivity or conductance of the carbon materials is measured by current detection circuitry.

Description

technical field [0001] The present invention relates to a detection device having a carbon-based sensing element, and methods of operation and construction thereof, and more particularly, the present invention relates to a dosimeter having a carbon-based sensing element. Background technique [0002] Dosimeters have been routinely used to calibrate and monitor radiotherapy equipment (eg, linear accelerators for external teletherapy). During radiation therapy, internal patient dosimeters are used to monitor the dose delivered to the patient to avoid unwanted exposure to healthy tissue. Some commonly used dosimeters include ionization chambers, thermoluminescent dosimeters (TLDs), radiographic and radiochromic films, and semiconducting silicon diode and metal oxide semiconductor field effect transistor (MOSFT) dosimeters. However, each of these dosimeters has certain disadvantages. [0003] For example, the large physical size of ionization chambers limits their spatial reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/02G01T1/26
CPCG01T1/026Y10T29/49002
Inventor 约翰·T·W·姚马家志
Owner 约翰·T·W·姚
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