Quality factor - Revision history

Chris Clement at 19:14, 18 August 2021

2021-08-18T19:14:09Z

Chris Clement: /* from ICRP Publication 103, 2007 */

2021-08-18T19:12:49Z

‎from ICRP Publication 103, 2007

Chris Clement at 19:07, 18 August 2021

2021-08-18T19:07:56Z

Chris Clement at 19:07, 18 August 2021

2021-08-18T19:07:24Z

Chris Clement: Created page with "link=ICRP Glossary A dimensionless factor defined to reflect the relative biological effectiveness of high-LET radiations co..."

2021-08-18T18:53:20Z

Created page with "100px|frameless|right|link=ICRP Glossary A dimensionless factor defined to reflect the relative biological effectiveness of high-LET radiations co..."

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[[File:Glossary Icon-2.png|100px|frameless|right|link=ICRP Glossary]]
A dimensionless factor defined to reflect the relative biological effectiveness of high-LET radiations compared with low-LET radiations at low exposure levels. <math>Q</math> is usually given by a function <math>Q(L)</math>, where <math>L</math> is the unrestricted LET in water. The quality factor at a point in tissue, is given by:

<math>
Q = \frac{1}{D} \int_{L=0}^\infty Q(L)D_LdL
</math>

where <math>D</math> is the [[absorbed dose]] at that point, <math>D_L</math> is the distribution of <math>D</math> in unrestricted LET <math>L</math> at the point of interest, and <math>Q(L)</math> is the quality factor as a function of <math>L</math>. The integration is to be performed over <math>D_L</math>, due to all charged particles, excluding their secondary electrons.

[[ICRP Publication 123]], 2013

'''Return to [[ICRP Glossary|Glossary]]'''

== Previous glossary entries ==

=== from [[ICRP Publication 131]], 2015 ===

@@ Line 14: / Line 14: @@
 == Previous glossary entries ==
-=== from [[ICRP Publication 103]], 2007 ===
+=== from [[ICRP Publication 103]], 2007 and [[ICRP Publication 127]], 2014===
 The factor characterising the biological effectiveness of a radiation, based on the ionisation density along the tracks of charged particles in tissue. <math>Q</math> is defined as a function of the unrestricted linear energy transfer, <math>L_\infty</math> (often denoted as <math>L</math> or LET), of charged particles in water:

@@ Line 16: / Line 16: @@
 === from [[ICRP Publication 103]], 2007 ===
-The factor characterising the biological effectiveness of a radiation, based on the ionisation density along the tracks of charged particles in tissue. Q is defined as a function of the unrestricted linear energy transfer, <math>L_\infty</math> (often denoted as <math>L</math> or LET), of charged particles in water:
+The factor characterising the biological effectiveness of a radiation, based on the ionisation density along the tracks of charged particles in tissue. <math>Q</math> is defined as a function of the unrestricted linear energy transfer, <math>L_\infty</math> (often denoted as <math>L</math> or LET), of charged particles in water:
 <math>

← Older revision		Revision as of 19:07, 18 August 2021
Line 14:		Line 14:
	== Previous glossary entries ==		== Previous glossary entries ==

−	=== from [[ICRP Publication ~~131~~]], ~~2015~~ ===	+	=== from [[ICRP Publication 103]], 2007 ===
		+
		+	The factor characterising the biological effectiveness of a radiation, based on the ionisation density along the tracks of charged particles in tissue. Q is defined as a function of the unrestricted linear energy transfer, <math>L_\infty</math> (often denoted as <math>L</math> or LET), of charged particles in water:
		+
		+	<math>
		+	Q(L) = \begin{cases}
		+	1, & \text{if } L < \text{10 keV/μm} \\
		+	0.32L - 2.2, & \text{if 10} \le L \le \text{100 keV/μm} \\
		+	300/\sqrt{L}, & \text {if } L > \text{100 keV/μm}
		+	\end{cases}
		+	</math>
		+
		+	<math>Q</math> has been superseded by the [[radiation weighting factor]] in the definition of [[equivalent dose]], but it is still used in calculating the operational dose equivalent quantities used in monitoring.

@@ Line 8: / Line 8: @@
 where <math>D</math> is the [[absorbed dose]] at that point, <math>D_L</math> is the distribution of <math>D</math> in unrestricted LET <math>L</math> at the point of interest, and <math>Q(L)</math> is the quality factor as a function of <math>L</math>. The integration is to be performed over <math>D_L</math>, due to all charged particles, excluding their secondary electrons.
-[[ICRP Publication 123]], 2013
+[[ICRP Publication 116]], 2010 and [[ICRP Publication 123]], 2013
 '''Return to [[ICRP Glossary|Glossary]]'''