half-value thickness

URNurn:iso:std:iso:80000:-10:ed-2:en:item:10-53

https://metanorma.github.io/isq-smart/quantities/part-10/t10-53
urn:iso:std:iso:80000:-10:ed-2:en:item:10-53

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-10:ed-2:en:item:10-53

IEC

urn:iec:std:iec:80000-10:2019:::item:10-53

Designations

ENhalf-value thickness

FRépaisseur de demi-atténuation

Symbol

d_{1 / 2}

Notation systems

Rendered

d_{1 / 2}

AsciiMath

d_(1//2)

LaTeX

d_{1 / 2}

Definition

thickness (ISO 80000-3: Space and time) of the attenuating layer that reduces the quantity of interest of a unidirectional beam of infinitesimal width to half of its initial value

épaisseur (ISO 80000-3: Space and time) de la couche d'atténuation qui réduit une grandeur caractéristique d'un faisceau parallèle de largeur infinitésimale à la moitié de sa valeur initiale

Units

m

metre

View related quantities →

Notes

For exponential attenuation, $d_{1 / 2} = ln (2) / μ$ . The quantity of interest is often the air kerma or exposure.

Pour une atténuation exponentielle, $d_{1 / 2} = ln (2) / μ$ . La grandeur caractéristique est souvent le kerma air ou l'exposition.

Concept HierarchyPendrill (2024)

Llength-type quantitiesLevel 0 · Kind

Broader concepts

◇ length-type 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:t10-53

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	10-53
skosxl:prefLabel	"half-value thickness"@en
skosxl:altLabel	"d_(1//2)"@en
skos:definition	thickness (<<iso80000-3>>) of the attenuating layer that reduces the quantity of interest of a unidirectional beam of in…
skos:note	For exponential attenuation, stem:[d_(1//2) = "ln"(2)//mu]. The quantity of interest is often the air kerma or exposure.
isq:hasUnit	m (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