Fluence

Jump to navigation Jump to search

WikiDoc Resources for Fluence

Articles

Most recent articles on Fluence

Most cited articles on Fluence

Review articles on Fluence

Articles on Fluence in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Fluence

Images of Fluence

Photos of Fluence

Podcasts & MP3s on Fluence

Videos on Fluence

Evidence Based Medicine

Cochrane Collaboration on Fluence

Bandolier on Fluence

TRIP on Fluence

Clinical Trials

Ongoing Trials on Fluence at Clinical Trials.gov

Trial results on Fluence

Clinical Trials on Fluence at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Fluence

NICE Guidance on Fluence

NHS PRODIGY Guidance

FDA on Fluence

CDC on Fluence

Books

Books on Fluence

News

Fluence in the news

Be alerted to news on Fluence

News trends on Fluence

Commentary

Blogs on Fluence

Definitions

Definitions of Fluence

Patient Resources / Community

Patient resources on Fluence

Discussion groups on Fluence

Patient Handouts on Fluence

Directions to Hospitals Treating Fluence

Risk calculators and risk factors for Fluence

Healthcare Provider Resources

Symptoms of Fluence

Causes & Risk Factors for Fluence

Diagnostic studies for Fluence

Treatment of Fluence

Continuing Medical Education (CME)

CME Programs on Fluence

International

Fluence en Espanol

Fluence en Francais

Business

Fluence in the Marketplace

Patents on Fluence

Experimental / Informatics

List of terms related to Fluence


Overview

In physics, fluence is defined as the number of particles that intersect a unit area . Its units are m-2. In particular, it is used to describe the strength of a radiation field. It is considered one of the fundamental units in dosimetry.

It has two equivalent definitions:

1) Imagine that an infinitesimal sphere of cross sectional area da is impinged upon by dN particles of a certain type. Then, the fluence is:

<math>\Phi = \frac{{\rm d} N}{{\rm d} a}</math>.

2) Using the same image of a small sphere as above:

<math>\Phi = \frac{\sum {\rm d \ell} }{{\rm d} V}</math>,

where <math>{\rm d} V </math> is the infintesimal volume and <math>\sum {\rm d \ell}</math> is the sum of all the path lengths of the particles that transverse the volume.


References

ICRU 33: Radiation Quantities and Units, April, 1980. (www.icru.org) Template:WH Template:WikiDoc Sources