Related Experiment Video
Updated: Jan 24, 2026
04:35
Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
Published on: July 5, 2024
2.4K
Model of Steady-state Temperature Rise in Multilayer Tissues Due to Narrow-beam Millimeter-wave Radiofrequency Field
Gregory B Gajda1, Eric Lemay, Jonathan Paradis2
11Non-ionizing Radiation Physical Sciences Division, Consumer and Clinical Radiation Protection Bureau, Health Canada.
Health Physics
|May 25, 2019
Summary
A new analytical model quantifies steady-state surface temperature rise in tissue from radiofrequency fields. This model aids in assessing localized health effects from millimeter wave exposure.
Area of Science:
- Biophysics
- Electromagnetics
- Thermal Medicine
Background:
- Assessing localized health effects from radiofrequency (RF) fields requires understanding tissue temperature rise.
- Millimeter wave (MMW) exposure poses unique challenges due to shallow penetration depth.
Purpose of the Study:
- Develop a closed-form analytical model for steady-state surface temperature rise in multilayer tissues exposed to MMWs.
- Relate temperature rise to exposure parameters like power density and beam dimensions.
- Provide a tool for assessing localized health risks.
Main Methods:
- Utilized finite-difference solutions of the Pennes bioheat transfer equation.
- Incorporated Monte Carlo techniques with statistical distributions of human tissue thicknesses.
- Validated model against analytical solutions and multiphysics simulations, achieving 1-2% agreement.
Main Results:
- Developed a four-parameter analytical model, including deterministic exposure parameters (power density, beam width) and stochastic tissue properties.
- Model demonstrates a direct relationship between exposure characteristics and surface temperature rise.
- Model is programmable in spreadsheets for practical application.
Conclusions:
- The analytical model provides an efficient method for assessing localized thermal effects from MMW exposure.
- The model can be used to evaluate safety guidelines and spatial averaging areas for RF exposure.
- This tool facilitates the assessment of health effects from localized RF field exposures.
Related Concept Videos
01:11Distribution of Stresses in a Narrow Rectangular Beam
494
In studying beam stress distribution, examining an elemental section is essential. To determine the average shearing stress on this face, the calculated shear is divided by the surface area. Importantly, shearing stresses on the beam's transverse and horizontal planes mirror each other, indicating a consistent stress distribution along the upper region of the beam. Notably, shearing stresses are absent at the beam's upper and lower surfaces due to the absence of applied forces in these...
494
01:18Rise of Liquid in a Capillary Tube
3.2K
When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
3.2K
02:12The Wave Nature of Light
61.1K
The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
61.1K
01:05Steady State Concentration
5.9K
A steady state refers to the level of a drug in the body once it has reached an equilibrium between administration and elimination. It represents the point at which the drug administration rate equals the drug elimination rate, resulting in a relatively constant concentration in the body over time. The dynamic equilibrium is crucial to ensure the drug's effectiveness with minimal risk of toxicity.
Most drugs are administered in repeated doses at fixed intervals or through continuous...
Most drugs are administered in repeated doses at fixed intervals or through continuous...
5.9K
01:27Steady Flow of a Fluid Stream
690
Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
690
01:30Beams
1.8K
Beams are integral components of structural engineering and construction, designed to support loads applied at various points along their length. These long, straight members can be classified based on geometry, cross-section, support type, and equilibrium condition.
Based on geometry, beams can be straight, tapered, or curved. Straight beams are the most common type and have a constant cross-section throughout their length. Tapered beams, on the other hand, have a varying cross-section along...
Based on geometry, beams can be straight, tapered, or curved. Straight beams are the most common type and have a constant cross-section throughout their length. Tapered beams, on the other hand, have a varying cross-section along...
1.8K