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10-49

linear attenuation coefficient

URNurn:iso:std:iso:80000:-10:ed-2:en:item:10-49

https://metanorma.github.io/isq-smart/quantities/part-10/t10-49
urn:iso:std:iso:80000:-10:ed-2:en:item:10-49

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-10:ed-2:en:item:10-49

IEC

urn:iec:std:iec:80000-10:2019:::item:10-49

Designations

ENlinear attenuation coefficient

FRcoefficient d'atténuation linéique

Symbol

μ

μ_{l}

Notation systems

Rendered

μ

Rendered

μ_{l}

AsciiMath

mu

AsciiMath

mu_l

LaTeX

\mu

LaTeX

\mu_{l}

Definition

for uncharged particles of a given type and energy the differential quotient $n$ with respect to $l$ , where $n$ is the fraction of $N$ incoming particles that experience interactions in traversing a distance (ISO 80000-3: Space and time) $l$ in a given material:

μ = \frac{d n}{d l} = \frac{1}{N} \frac{d N}{d l}

where $d N$ is the number of particles that experience interactions in traversing $d l$

pour des particules non chargées de type et d'énergie donnés, quotient différentiel de $n$ par rapport à $l$ , où $n$ est la fraction des $N$ particules entrantes qui subissent des interactions le long d'un parcours de longueur (ISO 80000-3: Space and time) $l$ dans un matériau donné:

μ = \frac{d n}{d l} = \frac{1}{N} \frac{d N}{d l}

où $d N$ est le nombre de particules qui subissent des interactions le long d'un parcours $d l$

Units

m^{- 1}

per metre

View related quantities →

Notes

$μ$ is equal to the macroscopic total cross section $Σ_{tot}$ for the removal of particles from the beam.

Using the relation $μ_{m} = μ / ρ$ between the linear attenuation coefficient $μ$ , the mass attenuation coefficient $μ_{m}$ (mass attenuation coefficient <ionizing radiation>) and the density $ρ$ , the definition given for the mass attenuation coefficient in report 85a of the ICRU can be applied to the linear attenuation coefficient resulting in:

The linear attenuation coefficient, $μ$ , of a material, for uncharged particles of a given type and energy, is the quotient of $d N / N$ by $d l$ , where $d N / N$ is the mean fraction of the particles that experience interactions in traversing a distance $d l$ in the material:

μ = \frac{1}{d l} \frac{d N}{N} .

This definition has an equivalent meaning as the one given in column 4 of this item.

Referenced by

volumic total cross section mass attenuation coefficient <ionizing radiation>molar attenuation coefficient atomic attenuation coefficient

Concept HierarchyPendrill (2024)

L⁻¹L⁻¹ quantitiesLevel 0 · Kind

Broader concepts

◇ L⁻¹ quantities

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:t10-49

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	10-49
skosxl:prefLabel	"linear attenuation coefficient <ionizing radiation>"@en
skosxl:altLabel	"mu"@en"mu_l"@en
skos:definition	for uncharged particles of a given type and energy the differential quotient stem:[n] with respect to stem:[l], where st…
skos:note	stem:[mu] is equal to the macroscopic total cross section stem:[ii(Sigma)_"tot"] for the removal of particles from the b…
isq:hasUnit	m^(-1) (per metre)
isq:hasDimension	isq:Dimension
smart:hasBindingnessType	bindingness-type:normative
dcterms:isPartOf	isq:part-10

Related Entities

isq:QuantityShape isq:part-10 isq:Unit isq:Dimension isq:hasDimension smart:TermEntry