ICRP 74 - Conversion coefficientes for use in radiological protection against external radiation
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2. Annals of the ICRP
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fusnord
hr&ce
fu4' of Terms and Defi
IL TNTRODUCTION
L QUANTITIES USED
E(TERNAL RADIA]
al. Introduction
22- The Evolution of
Radiation
2.2.1. General
2.2.2. Dose eqr
2.2.3. The max
2.2.4. Conversi,
2.2.5. Dose eqt
2.2.6. Effective
2.2.7. Operatio
2.2.8. ICRP Pu
2.2.9. The Parir
2.2.10. ICRU R
2.2.11. ICRP Pu
2,2.12. ICRU R
2.2.13. Summar;
2-3. Absorbed Dose
2.3.1. Absorbe<
2.3.2. Absorber
2.3.3. Mean ab
2.4. Radiation Weigh
2.4.1. General
2.4.2. Radiatio
2.4.3. Radiatio
2.4.4. Radiatio
2.4.5. Radiatio
2.4.6. Q@)-L
2.4.7. Mean qu
2.4.8. Stopping
2.5. Radiological Pro
2.5.1. General
2.5.2. Organ al
2.5.3. Equivale
2.5.4. Effective
6. lv CONTENTS
2.6. Operational Quantities
2.6.1. General
2.6.2. Dose equivalent
2.6.3. Operational quantities for area monitoring
2.6.4. Operational quantities for individual monitoring
3. DETERMINATION OF ABSORBED DOSE DISTRIBUTIONS IN THE
HUMAN BODY AND IN ANTHROPOMORPHIC AND OTHER MODELS
3.1. Introduction
3.2. Radiation Field
3.3. Models and Phantoms of the Human Body
3.3.1. Reference man
3.3.2. Simple phantoms
3.3.3. Anthropomorphic models
3.4. Methods of Calculating Absorbed Dose Distributions
3.4.1. Introduction
3.4.2. Transport codes-general features and special codes
3.5. Irradiation Geometries
3.5.1. General
3.5.2. Geometries used with the ICRU Sphere
3.5.3. Geometries used with the ICRU Slab
4. CO}WERSIONCOEFFICIENTS
4.1. Introduction
4.2. General
4.2.1. Radiation energy spectra and mixed radiation fields
4.3. Conversion Coefficients for Photons
4.3.1. Introduction
4.3.2. Special considerations for photons
4.3-3. Methods of calculation
4.3.4. Available data
4.3.5. Conversion coefficients and analysis
4.4. Conversion Coefficients for Neutrons
4.4.1. Introduction
4.4.2. Special considerations for neutrons
4.4.3. Methods of calculation
4.4.4. Available data
4.4.5. Conversion coefficients and analysis: Protection Quantities
4.5. Conversion Coefficients for Electrons
4.5.1. Introduction
4.5.2. Special considerations for electrons
4.5.3. Methods of calculation
4.5.4. Available data
4.5.5. Conversion coefficients and analysis: Protection Quantities
5. RELATIONSHIPS BETWEEN QUANTITIES
5.1. Introduction
5.2. Changes in the Protection and Operational Quantities
5.2.1. General
l5
t6
t7
t7
t7
2t
2t
22
24
24
24
24
26
26
27
31
31
33
33
35
35
35
35
36
36
36
37
37
40
50
50
50
5l
53
59
7l
7l
7t
72
72
74
83
83
83
83
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FTGURES
TABLES
8. Following the 1977 Recommendations of the International Commission on Radiological
Protection (ICRP), the International Commission on Radiation Units and Measurements
(ICRU) developed a set of measurable operational quantities to supplement those dosimetric
quantities that are specified in the human body by the ICRP, sometimes called protection
quantities. The 1990 ICRP Recommendations made some changes to the specification of
these protection quantities.
As a result, a Joint Task Group of the ICRP and the ICRU was established with the
principal aim of determining whether the operational quantities still represent adequately the
protection quantities. The conclusion is that, with some exceptions that are not of
significance for radiological protection, the operational quantities continue to achieve their
objective.
The report provides an extensive and authoritative set of data linking field quantities,
operational quantities and protection quantities in a way that will be of help to those
working in radiological protection.
It was agreed that the final report, which has been approved by both Commissions, would
be published in the Annals of the ICRP and as an ICRU Report.
vi
9. This report was prepared by a Joint Task Group of the International Commission on
Radiological Protection (ICRP) and the International Commission on Radiation Units and
Measurements (ICRU). The terms of reference of the Joint Task Group are discussed in the
Introduction (Section 1).
The Joint Task Group had the following membership:
Full Members
R. H. Thomas (Chairman)
L. W. Brackenbush G. Dietze
J-L. Chartier G. Drexler
M. J. Clark H. G. Menzel
Corresponding Members
R. Griffith B. R. L. Siebert
B. Grosswendt M. Zankl
N. Petoussi-Henss
The membership of ICRP Committee 2 during the period of the Joint Task Group was:
A. Kaul (Chairman) F. A. Fry M. Roy
A. Bouville J. Inaba J. W. Stather
X. Chen I. A. Likhta& D. M. Taylor
F. T. Cross H. MCtivier R. H. Thomas
G. Dietze H. G. Paretzke
K. F. Eckerman A. R. Reddy
The ICRU Sponsors of the report were:
R. S. Caswell
P. M. DeLuca
Members of the International Commission on Radiological Protection during the
preparation of this report:
R. H. Clarke (Chairman) A. Kaul
C. B. Meinhold (Vice-Chairman) D. Li
D. Beninson J. Liniecki
H. J. Dunster H. Matsudaira
L. A. Ilyin F. Mettler
W. Jacobi W. K. Sinclair
H. P. Jammet m H. Smith (Scientific Secretary)
Members of the International Commission on Radiation Units and Measurements during
the preparation of this report:
A. Allisy (Chairman) M. Inokuti
A. Wambersie (Vice-Chairman) I. Isherwood
R. S. Caswell (Secretary) H. G. Menzel
P. M. DeLuca H. G. Paretzke
K. Doi H. H. Rossi
L. Feinendegen G. F. Whitmore
W. R. Ney (Assistant Secretary)
vii
10.
11. GLOSSARY OF TERMS AND DEFINITIONS OF QUANTITIES
Absorbed Dose
denoted as D, is the quotient of dE by dm, where dE is the mean energy imparted by
ionising radiation to matter of mass dm, thus
D,!C
dm
The unit of absorbed dose is joule per kilogram (J kg-‘
) and its special name is gray (Gy).
Ambient Dose Equivalent
denoted as H*(d), at a point in a radiation field is the dose equivalent that would be
produced by the corresponding expanded and aligned field in the ICRU sphere at a depth,
d, on the radius opposing the direction of the aligned field. The unit of ambient dose
equivalent is joule per kilogram (J kg-‘
) and its special name is sievert (Sv).
Directional Dose Equivalent
denoted as H’
(d,@, at a point in a radiation field, is the dose equivalent that would be
produced by the corresponding expanded field in the ICRU sphere at depth, d, on a radius
in a specified direction, fi. The unit of directional dose equivalent is joule per kilogram
(J kg- ‘
) and its special name is sievert (Sv).
Dose Equivalent
denoted as H, is the product of Q and D at a point in tissue, where D is the absorbed dose
and Q is the quality factor at that point, thus
H=QD.
The unit of dose equivalent is joule per kilogram (J kg-‘
) and its special name is sievert
(Sv).
Dose Equivalent Index’
, HI
maximum dose equivalent within the ICRU sphere centred at the point in space to which
the quantity is assigned. The outer 0.07 mm thick shell is ignored. It was also called the
unrestricted dose equivalent index (see ICRU, 1980) (see also ICRU, 1988 for a definition
of deep and shallow dose equivalent index).
Effective Dose
a summation of the equivalent doses in tissues or organs, each multiplied by the
appropriate tissue weighting factor. It is given by the expression
where HT is the equivalent dose in tissue or organ, T, and wr is the tissue weighting factor
‘
Obsolete quantity; included for completeness.
ix
12. X GLOSSARY OF TERMS AND DEFINITIONS OF QUANTITIES
for tissue, T (see Table 3). The effective dose can also be expressed as the sum of the
doubly weighted absorbed dose in all the tissues and organs of the body.
Effective Dose Equivalent
denoted as HE, is the weighted average of the annual dose equivalents, each weighted by a
tissue or organ weighting factor, thus:
HE=&&
T
where HT is the annual dose equivalent in tissue, T, and WT is the tissue weighting factor
for tissue, T, as formerly recommended by the ICRP (see Table 1).
Energy Imparted
denoted as E, by the ionising radiation to matter in a volume is given by:
E = Ri” - Rout+ ZQ
where Ri, is the radiant energy incident on the volume, i.e. the sum of all the energies
(excluding rest energies) of all those charged and uncharged ionising particles that enter the
volume; R,,, is the radiant energy emerging from the volume, i.e. the sum of all the energies
(excluding rest energies) of all those charged and uncharged ionising particles that leave the
volume; and CQ is the sum of all changes of the rest mass energy of nuclei and elementary
particles in any interactions that occur in the volume. (In the sum, decreases are denoted by
( + ) and increases are denoted by (-).) The expectation value of E, termed the mean energy
imparted and denoted I, is closely related to the definition of the absorbed dose, D.
Equivalent Dose
denoted as HT,R, is the absorbed dose in an organ or tissue multiplied by the relevant
radiation weighting factor (see Table 2), thus:
HT,R = WR-DT,R
where DT,R is the absorbed dose averaged over the tissue or organ, T, due to radiation R,
and wn is the radiation weighting factor for radiation, R. When the radiation field is
composed of radiations with different values of wn, the absorbed dose is subdivided into
blocks, each multiplied by its own value of wn and summed to determine the total
equivalent dose, i.e.
HT = &'R.DT,R
R
The unit of equivalent dose is joule per kilogram (J kg-‘
) and its special name is sievert
(Sv).
Fluence
denoted as @,is the quotient of dN by da, where dN is the number of particles incident on
a sphere of cross-sectional area da, thus:
13. GLOSSARY OF TERMS AND DEFINITIONS OF QUANTITIES xi
Individual Dose Equivalent, penetrating, H,,(d)
the dose equivalent in soft tissue below a specified point on the body at depth, d, which is
appropriate for strongly penetrating radiation.
Individual Dose Equivalent, superficial, H,(d)
the dose equivalent in soft tissue below a specified point on the body at a depth, d, which is
appropriate for weakly penetrating radiation (see personal dose equivalent).
Kerma, K
the quotient of dE,, by dm, where dE,, is the sum of the initial kinetic energies of all the
charged ionising particles liberated by uncharged ionising particles in a volume element of
mass dm, thus:
The unit of kerma is joule per kilogram (J kg-‘
) and its special name is gray (Gy).
Linear Energy Transfer
or linear collision stopping power, L, of a material, for a charged particle, is the quotient
of dE by df, where dE is the mean energy lost by the particle, owing to collisions with
electrons, in traversing a distance dL, thus:
Operational Quantity
a quantity with which, by means of its measurement, compliance with the system of
protection may be demonstrated. Examples of operational quantities are ambient dose
equivalent, directional dose equivalent and personal dose equivalent.
Organ Dose
for radiation protection purposes. It is the mean absorbed dose, DT, in a specified tissue or
organ of the human body, T, given by
DT = (l/mT) D dm or &T/m=
where m-r is the mass of tissue or organ, D is the absorbed dose in the mass element dm,
and &Tis the total energy imparted in the tissue or organ.
Personal Dose Equivalent
denoted as H,,(d), is the dose equivalent in soft tissue at an appropriate depth, d, below a
specified point on the body. The unit of personal dose equivalent is joule per kilogram
(J kg-‘
) and its special name is sievert (Sv).
Protection Quantities
dosimetric quantities specified in the human body by the ICRF’
. Examples of protection
quantities are effective dose and equivalent dose.
14. Xii GLOSSARY OF TERMS AND DEFINITIONS OF QUANTITIES
Quality Factor
a function, Q, of unrestricted linear energy transfer, L, in water. Values of Q(L) as a
function of L are given in ZCRP Publication 60 (ICRP, 1991a) by the following relations:
Q(L) = 1 (L < 10)
Q(L) = 0.32L - 2.2 (10 5 L 2 100)
Q(L) = 300/,/L (L > 100)
where L is expressed in keV pm-‘
.
The mean quality factor, Q-r, in a specified tissue or organ, T, is given by
QDdm
where DT is the mean absorbed dose to the tissue or organ, mr is its mass, and Q and D
are the quality factors and the absorbed dose in the mass element dm, respectively.
Relative Biological Effectiveness, RBEM
the ratio of the absorbed dose of a reference radiation to the absorbed dose of a given test
radiation required to produce the same level of response, all other conditions being kept
constant. The subscript M refers to a stochastic effect.
Radiation Weighting Factor
A factor denoted wn, by which the tissue or organ absorbed dose is multiplied to reflect
the higher RBEM values for neutrons and alpha particles compared with low LET
radiations. Table 2 gives the values of radiation weighting factor used for radiological
protection purposes as now recommended by ICRP.
When calculation of the radiation weighting factors for neutrons requires a continuous
function, the following approximation can be used:
where E,, is the neutron energy in MeV. There is no intention to imply any biological
meaning to this relationship. It is simply a tool for calculation.
For radiation types and energy that are not included in this table, an approximation of
wa can be obtained by calculation of Q at a depth of 10 mm in the ICRU sphere:
where D(L)dL is the absorbed dose at 10 mm between linear energy transfer, L, and
L+dL; and Q(L) is the quality factor at 10 mm [paragraph A14, ZCRP Publication 60
(ICRP, 1991a)l.l
‘
The symbol D(L) has historically been used by the ICRP for the absorbed dose between linear energy transfer, L,
and L+ dL. ICRU uses DL for the same quantity. In both instances the more usual mathematical symbol would be
dD/dL.
15. ...
GLOSSARY OF TERMS AND DEFINITIONS OF QUANTITIES
Tissue Weighting Factor, wT
Xl11
a factor by which the equivalent dose to a tissue or organ is multiplied in order to account
for the relative stochastic detriment resulting from the exposure of different tissues and
organs. (See Table 3 for the tissue weighting factors as now recommended by ICRP.)
Table 1. Tissue weighting factors (ICRP Publicclrion 26)a
Tissue or organ Tissue weighting factor, or
Gonads 0.25
Bone marrow (red) 0.12
Lung 0.12
Breast 0.15
Thyroid 0.03
Bone surfaces 0.03
Remainder 0.30
“ICRP (1977); see paragraph 105 of ICRP Publication 26 for further
details of Remainder Tissues.
Table 2. Values for radiation weighting factors (ZCRP Publicution 60)’
Types of energy range of radiation
Photons, all energies
Electrons and muons, all energiesb
Neutrons, energy
< 10 keV
16100 keV
> 100 keV to 2 MeV
> 2-20 MeV
> 20 MeV
Protons, other than recoil protons, energy > 2 MeV
Alpha particles, fission fragments, heavy nuclei
Radiation weighting factor, wa
1
1
5
10
20
10
5
5
20
“ICRP (199la).
bExcluding Auger electrons emitted from nuclei bound to DNA, for which special
microdosimetric considerations are needed.
Table 3. Tissue weighting factors”
Tissue or organ Tissue weighting factor, wr
Gonads 0.20
Bone marrow (red) 0.12
Colon 0.12
Lung 0.12
Stomach 0.12
Bladder 0.05
Breast 0.05
Liver 0.05
Oesophagus 0.05
Thyroid 0.05
Skin 0.01
Bone surface 0.01
Remainder 0.05
*See footnotes on Table 2 of ICRP Puhlicurion 60 for further
details.
222. I
ICRP Publication 54 (Annals of the ICRP Vol. 19 No. l-3)
Individual Monitoring for Intakes of Radionuclides by Workers: Design and
Interpretation
ICRP Publication 53 (Annals of the ICRP Vol. 18 No. l-4)
Radiation D ose t o P at ient s .fr om Radiopharmaceutic als
ICRP Publication 52 (Annals of the ICRP Vol. 17 No. 4)
Protection of the Patient in Nuclear Medicine
ICRP Publication 51 (Annals of the ICRP Vol. 17 No. 2/3)
Data for (Jse in Protection Against External Radiation
ICRP Publication 50 (Annals of the ICRP Vol. 17 No' 1)
Lung Cancer Risk from Indoor Exposures to Radon Daughters
ICRP Publication 49 (Annals of the ICRP Vol. 16 No. 4)
Developmentat Efibcts of lrradiation on the Brain of the Embryo and Fetus
ICRP Publication 48 (Annals of the ICRP Vol. 16 No. 2/3)
The Metabolism of Plutonium and Related Elements
ICRP Publication 47 (Annals of the ICRP Vol. 16 No' l)
Radiation Proteclion of Workers in Mines
ICRP Publication 46 (Annals of the ICRP Vol. 15 No. 4)
Radintion Protection Principles for the Disposal of Solid Radioactive Waste
ICRP Publication 45 (Annals of the ICRP Vol. 15 No. 3)
Quantitative Bases.for Developing a Unified Index of Harm
ICRP Publication 44 (Annals of the ICRP Vol. 15 No. 2)
Protection of the Patient in Radiation Therapy
ICRP Publication 43 (Annals of the ICRP Vol. 15 No. 1)
Principles of Monitoring.for the Radiation Protection of the Population
ICRP Publication 42 (Annals of the ICRP Vol. 14 No. 4)
A Compilation of the Maior Concepts and Quantities in use by ICRP
ICRP Publication 4l (Annals of the ICRP Vol. 14 No. 3)
Nonstochaslic Efi'ects of lonizing Radiation
ICRP Publication 40 (Annals of the ICRP Vol. 14 No. 2)
Protection of the Public in the Event of Maior Radiation Accidents:
Princip les .for P lanning
ICRP Publication 39 (Annals of the ICRP Vol. 14 No. l)
Principles.for Limiting Exposure of the Public to Natural Sources of Radiation
ICRP Publication 38 (Annals of the ICRP Vols. I l-13)
Radionuclide Transformations: Energy and Intensity of Emissions
ICRP Publication 37 (Annals of the ICRP Vol. l0 No. 2/3)
Cost-Benefit Analysis in the Optimization of Radiation Protection
ICRP Publication 36 (Annals of the ICRP Vol. l0 No. l)
Protection against lonizing Radiation in the Teaching of Science
ICRP Publication 34 (Annals of the ICRP Vol. 9 No. 2/3)
Protection of the Patient in Diagnostic Radiology
ICRP Publication 32 (Annals of the ICRP Vol. 6 No. 1)
Limits of Inhalation of Radon Daughters by Workers
ICRP Publication 30
Limits for Intakes of Radionuclides by Workers
Part I (Annals of the ICRP Vol. 2 No. 3/4)
Part 2 (Annals of the ICRP Vol. a No. 3/4)
Supplement to Part 2 (Annals of the ICRP Vol. 5)
Part 3 (Annals of the ICRP Vol. 6 No. 2/3)
Supplement A to Part 3 (Annals of the ICRP Vol. 7)
B to Part 3 (Annals of the ICRP Vol. 8 No. l-3)
Part 4: An Addendum (Annals of the ICRP Vol. 19 No. 4)
0 08 035600 I
0 08 035591 9
0 08 033188 2
0 08 035s87 0
0 08 035579 X
0 08 035203 0
0 08 034827 0
0 08 034020 2
0 08 033666 3
0 08 033665 5
0 08 032336 7
0 08 032335 9
0 08 032334 0
0 08 032333 2
0 08 032302 2
0 08 031503 8
0 08 030761 2
0 08 029817 6
0 08 029818 4
0 08 029797 8
0 08 028864 2
0 08 022638 8
0 08 026832 3
0 08 026833 I
0 08 026834 X
0 08 026835 8
0 08 036886 7
II
224. Annals of the ICRP
Aims and Scope
Founded in 1928, the International Commission on Radiological Protection has, since 1950,
been providing general guidance on the widespread use of radiation sources causeci by
developments in the field of nuclear energy.
The reports and recommendations of the ICRP are available in the form of a review journal,
Anncls of the ICRP. Subscribers to the journal will receive each new report as soon as it
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bookseller, subscription agent or, in case of difficulty. direct from the publisher.
Future publications of the ICRP
ICRP Publication -, General Principles for Radiation Protection of Workers (1996197).
ICR.P Publication -, Pratection from Potentia! Exposure' Application to Selected Radiation Sources
(lee6le1).
ICRP Publication -, Age-dependent Doses to Members of the Public from Intake of Radionuclides, Part 6,
Entbrya and Fetus (1996197).
ICRP Publication -, Indiuidual Monitoring .for Intakes of Radionuclides by Workers: Design and
Interpretation" (Update of Publication 54) (199697).
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Radionuciide (1997).
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