Individual:
http://rdf.iit.demokritos.gr/2014/iaeaSafetyGlossary/id560
Annotations (2)
-
nreo:canonicalLabel "radiation weighting factor, <i>w</i></b><b>R" (en)
-
skos:definition "A number by which the 'absorbed dose' in a tissue or organ is multiplied to <br/>
reflect the 'relative biological effectiveness' of the 'radiation' in inducing <i>stochastic <br/>effects</i> at low 'doses', the result being the 'equivalent dose'.<br/>
Values are selected by the International Commission on Radiological <br/>Protection to be representative of the relevant <i>relative biological effectiveness<br/></i>and are broadly compatible with the values previously recommended for <br/>'quality factors' in the definition of 'dose equivalent'. The <i>radiation weighting <br/>factor</i> values recommended by the International Commission on Radiological <br/>Protection [16] are:<br/>
Type of 'radiation'<br/>
'w'R <br/>
Photons, all energies<br/>
1<br/>
Electrons and muons, all energiesa<br/>
1<br/>
Neutrons, energy:<br/>
<10 keV<br/>
5<br/>
10 keV to 100 keV<br/>
>100 keV to 2 MeV<br/>
>2 MeV to 20 MeV<br/>
>20 MeV<br/>
5<br/>
Protons, other than recoil protons, energy >2 MeV<br/>
5<br/>
Alpha particles, 'fission fragments', heavy nuclei<br/>
a<br/>
Excluding Auger electrons emitted from radionuclides <br/>bound to DNA, for which special microdosimetric <br/>considerations apply.<br/>
If calculation of the 'radiation weighting factor' for neutrons requires a <br/>continuous function, the following approximation can be used, where 'E' is the <br/>neutron energy in MeV:<br/>
2<br/>
'w'<br/>
(ln( 'E'<br/>
e<br/>
)) /<br/>
= +<br/>
-<br/>
5 17<br/>
2<br/>
6<br/>
R<br/>
For 'radiation' types and energies not included in the table, 'w ' can be taken to <br/>
R<br/>
'—'<br/>
be equal to 'Q 'at 10 mm depth in the 'ICRU sphere' and can be obtained as <br/>follows:<br/>
•<br/>
1<br/>
'Q '=<br/>
'Q'('L')'D 'd'L'<br/>
Ú<br/>
'D'<br/>
'L'<br/>
0<br/>
where 'D' is the 'absorbed dose', 'Q'('L') is the 'quality factor' in terms of the <br/>'unrestricted linear energy transfer' 'L' in water, specified in Ref. [16], and 'D ' is <br/>
'L'<br/>
the distribution of 'D' in 'L'.<br/>
Ï<br/>
1<br/>
for<br/>
'L '£ 10<br/>
Ô<br/>
'Q'('L') = Ì .<br/>
0 32'L '- .<br/>
2 2<br/>
for<br/>
10 < 'L '< 100<br/>
Ô 300/ 'L 'for<br/>
'L'<br/>
Ó<br/>
≥ 100<br/>
where 'L' is expressed in keV/mm.<br/>
<b>radioactive</b>' (adjective)'<br/>
1. Exhibiting 'radioactivity'; emitting or relating to the emission of <br/>
'ionizing radiation' or particles.<br/>
This is the ‘scientific’ definition, and should not be confused with the <br/>‘regulatory’ definition (2).<br/>
2. Designated in national law or by a 'regulatory body' as being subject to <br/>
'regulatory control' because of its 'radioactivity'.<br/>" (en)
Types (1)
Usage (10)