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Related Concept Videos

Radiation: Applications01:17

Radiation: Applications

2.0K
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
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Absorption of Radiation01:05

Absorption of Radiation

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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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Radial System Protection01:23

Radial System Protection

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Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
In a radial system with a fault downstream of the third breaker, ideally, only the third breaker will open, isolating the fault and interrupting the load connected beyond it. The second breaker has a longer delay setting,...
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Radiation Pressure: Problem Solving01:09

Radiation Pressure: Problem Solving

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The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force...
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Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
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[Study on Intelligent Automatic Tracking Radiation Protection Curtain].

Longyang Zhao, Jindong Han, Minjian Ou

    Zhongguo Yi Liao Qi Xie Za Zhi = Chinese Journal of Medical Instrumentation
    |February 25, 2016
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    Summary

    This study introduces an active protection X-ray device that automatically adjusts shielding to reduce radiation exposure for patients. This innovation significantly lowers X-ray dose in non-irradiated areas, enhancing safety and efficiency.

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    Area of Science:

    • Medical Imaging
    • Radiation Oncology
    • Biomedical Engineering

    Background:

    • Traditional X-ray inspection systems primarily rely on passive radiation protection methods.
    • Limitations of passive protection include potential for significant radiation exposure in non-target areas.
    • There is a need for advanced systems to improve radiation safety during X-ray procedures.

    Purpose of the Study:

    • To develop and evaluate an active protection X-ray equipment system.
    • To enhance patient safety by minimizing radiation exposure to non-irradiated body parts.
    • To improve the overall efficiency of X-ray examinations.

    Main Methods:

    • Integration of automatic control technology with X-ray equipment.
    • Development of a system for automatic detection of the patient's irradiation area.
    • Implementation of intelligent adjustment for the height of an automatic tracking radiation protection device.
    • Utilizing professional testing to quantify radiation dose reduction.

    Main Results:

    • The active protection X-ray equipment demonstrated automatic adjustment capabilities.
    • The system effectively reduced X-ray radiation in non-irradiated areas.
    • Professional testing confirmed a reduction of over 90% in X-ray dose for non-irradiated zones.
    • Work efficiency was improved through intelligent automation.

    Conclusions:

    • The developed active protection X-ray equipment overcomes limitations of traditional passive methods.
    • The system offers significant advantages in reducing patient radiation dose and enhancing safety.
    • Intelligent automation and active shielding represent a substantial advancement in X-ray technology.