Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Spherical and Cylindrical Capacitor

Spherical and Cylindrical Capacitor

A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
Conventionally, considering the symmetry, the electric field between the concentric shells of a spherical capacitor is directed radially outward. The magnitude of the field, calculated by...

Steady, Laminar Flow in Circular Tubes

Steady, Laminar Flow in Circular Tubes

Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is purely axial,...

Deformation in a Circular Shaft

Deformation in a Circular Shaft

One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.

Pascal's Law

Pascal's Law

In 1653, the French philosopher and scientist Blaise Pascal published "Treatise on the Equilibrium of Liquids," which discussed the principles of static fluids. A static fluid is a fluid that is not in motion. When a fluid is not flowing, we say that the fluid is in static equilibrium. If the fluid is water, we say it is in hydrostatic equilibrium. For a fluid in static equilibrium, the net force on any part of the fluid must be zero; otherwise, the fluid will start to flow. Pascal observed...

Bending of Material: Problem Solving

Bending of Material: Problem Solving

In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Current best estimates of beam quality correction factors for reference dosimetry of clinical proton beams.

Physics in medicine and biology·2022

Same author

Experimental determination of<i>k</i><sub></sub>factors for two types of ionization chambers in scanned proton beams.

Physics in medicine and biology·2022

Same author

Cema-based formalism for the determination of absorbed dose for high-energy photon beams.

Medical physics·2021

Same author

Corrigendum: Data for the dosimetry of low- and medium-energy kV x rays (2019<i>Phys. Med. Biol.</i><b>64</b>205019).

Physics in medicine and biology·2021

Same author

Technical Note: SpekPy v2.0-a software toolkit for modeling x-ray tube spectra.

Medical physics·2021

Same author

A model for the energy and angular distribution of x rays emitted from an x-ray tube. Part I. Bremsstrahlung production.

Medical physics·2020

Search research articles

Related Experiment Video

Updated: Jun 16, 2026

Calibration Procedures for Orthogonal Superposition Rheology

Calibration Procedures for Orthogonal Superposition Rheology

Published on: November 18, 2020

On the p(dis) correction factor for cylindrical chambers.

Physics in Medicine and Biology

|February 17, 2010

Summary

This summary is machine-generated.

This study re-evaluates the displacement perturbation correction factor (p(dis)) for cylindrical chambers, finding that deviations in absorbed dose are typically much smaller than previously claimed. The impact on practical photon dosimetry is negligible, with only minor deviations at high energies.

More Related Videos

Measuring the Complete-arch Distortion of an Optical Dental Impression

Measuring the Complete-arch Distortion of an Optical Dental Impression

Published on: May 30, 2019

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Published on: March 11, 2021

Related Experiment Videos

Last Updated: Jun 16, 2026

Calibration Procedures for Orthogonal Superposition Rheology

Calibration Procedures for Orthogonal Superposition Rheology

Published on: November 18, 2020

Measuring the Complete-arch Distortion of an Optical Dental Impression

Measuring the Complete-arch Distortion of an Optical Dental Impression

Published on: May 30, 2019

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Published on: March 11, 2021

Area of Science:

Medical Physics
Radiation Dosimetry
Computational Physics

Background:

Critically examines Monte Carlo simulations of the displacement perturbation correction factor (p(dis)) for cylindrical chambers.
Addresses claims regarding normalization at dmax and its impact on IAEA TRS-398 Code of Practice beam calibration.

Discussion:

Demonstrates that deviations in absorbed dose for commercial Farmer-like chambers are significantly smaller (approx. 0.13%) than reported by Wang and Rogers.
Argues that the impact of proposed p(dis) values is negligible for practical high-energy photon dosimetry.
Highlights that substantial deviations (0.4%) only occur at the highest clinical energies (around 25 MV).

Key Insights:

The influence of proposed p(dis) values on radiotherapy photon beams is minimal due to the prevalence of lower energies.
Questions the proposed increase in p(dis) for Farmer chambers at 60Co, citing potential discrepancies in electron beam dosimetry and cross-calibration of plane-parallel chambers.
Suggests the 60Co source spectrum's influence may be significant for high-precision dosimetry calculations.

Outlook:

Further investigation into the precise impact of 60Co source spectrum on Monte Carlo simulations is warranted.
Re-evaluation of p(dis) values may be necessary for specific clinical scenarios and high-precision dosimetry.
Potential refinement of dosimetry protocols to account for subtle variations in perturbation factors.