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Section 7-352 entries

7-35.1linear attenuation coefficient, linear extinction coefficient <radiometry>7-35.2linear absorption coefficient <radiometry>

7-35.1

linear attenuation coefficient, linear extinction coefficient

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-35.1

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-7/t7-35.1
urn:iso:std:iso:80000:-7:ed-2:en:item:7-35.1

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-35.1

IEC

urn:iec:std:iec:80000-7:2019:::item:7-35.1

Designations

ENlinear attenuation coefficient

FRcoefficient d'atténuation linéique

ENlinear extinction coefficient

FRcoefficient d'extinction linéique

Symbol

μ

μ_{l}

Notation systems

Rendered

μ

Rendered

μ_{l}

AsciiMath

mu

AsciiMath

mu_"l"

LaTeX

\mu

LaTeX

\mu_{\text{l}}

Definition

relative decrease in radiant flux caused by absorption and scattering

diminution relative du flux énergétique produite par absorption et diffusion

Units

m^{- 1}

per metre

View related quantities →

Notes

This quantity is also defined spectrally in terms of wavelength, in which case, "spectral" is added before this quantity name.

The spectral linear attenuation coefficient can be expressed by the relative decrease in the spectral radiant flux, $Φ_{e, λ} (λ)$ , with respect to propagation length, $l$ , of a collimated beam at a point in an absorbing and scattering medium

μ (λ) = \frac{1}{Φ_{e, λ} (λ)} \frac{d Φ_{e, λ} (λ)}{d l}

Similarly, luminous and photon quantities can be defined.

Cette grandeur est également définie spectralement en longueur d'onde, auquel cas l'adjectif «spectral» est ajouté au nom de cette grandeur.

Le coefficient d'atténuation linéique spectral peut être exprimé par la diminution relative du flux énergétique spectrique, $Φ_{e, λ} (λ)$ , en fonction de la longueur de propagation, $l$ , d'un faisceau quasi-parallèle en un point d'un milieu absorbant et diffusant.

μ (λ) = \frac{1}{Φ_{e, λ} (λ)} \frac{d Φ_{e, λ} (λ)}{d l}

On peut définir de même des grandeurs lumineuses et photoniques.

Referenced by

linear absorption coefficient <radiometry>mass attenuation coefficient <radiometry>

Concept HierarchyPendrill (2024)

L⁻¹L⁻¹ quantitiesLevel 0 · Kind

Broader concepts

◇ L⁻¹ quantities

Characterizes

● photon

Ontology
isq:Quantity smart:TermEntry

Class Hierarchy

smart:Entity smart:TermEntryisq:Quantity

A physical quantity as defined in ISO/IEC 80000, with associated symbols, definitions, and units of measurement.

Instance IRI

isq:t7-35.1

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-35.1
skosxl:prefLabel	"linear attenuation coefficient"@en
skosxl:altLabel	"linear extinction coefficient <radiometry>"@en"mu"@en"mu_"l""@en
skos:definition	relative decrease in radiant flux caused by absorption and scattering
skos:note	This quantity is also defined spectrally in terms of wavelength, in which case, "spectral" is added before this quantity…
isq:hasUnit	m^(-1) (per metre)
isq:hasDimension	isq:Dimension
smart:hasBindingnessType	bindingness-type:normative
dcterms:isPartOf	isq:part-7

Related Entities

isq:QuantityShape isq:part-7 isq:Unit isq:Dimension isq:hasDimension smart:TermEntry