ASTM E170-05
(Terminology)Standard Terminology Relating to Radiation Measurements and Dosimetry
Standard Terminology Relating to Radiation Measurements and Dosimetry
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Designation:E170–05
Standard Terminology Relating to
1
Radiation Measurements and Dosimetry
This standard is issued under the fixed designation E170; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
This terminology generally covers terms that apply to radiation measurements and dosimetry
associatedwithenergydepositionandradiationeffects,ordamage,inmaterialscausedbyinteractions
by high-energy radiation fields. The common radiation fields considered are X-rays, gamma rays,
electrons, alpha particles, neutrons, and mixtures of these fields. This treatment is not intended to be
exhaustive but reflects special and common terms used in technology and applications of interest to
CommitteeE10,asforexample,inareasofradiationeffectsoncomponentsofnuclearpowerreactors,
radiation hardness testing of electronics, and radiation processing of materials.
Thisterminologyusesrecommendeddefinitionsandconceptsofquantities,withunits,forradiation
measurements as contained in the International Commission on Radiation Units and Measurements
2
(ICRU) Report 33 on “Radiation Quantities and Units,”April 15, 1980. Those terms that are defined
essentiallyaccordingtotheterminologyofICRUReport33willbefollowedbyICRUinparentheses.
It should also be noted that the units for quantities used are the latest adopted according to the
International System of Units (SI).
1. Referenced Documents absorbeddoseisthegray(Gy),where1grayisequivalentto
3 the absorption of 1 joule per kilogram of the specified
1.1 ASTM Standards:
material (1 Gy = 1 J/kg). The mathematical relationship is
E380 Practice for Use of the International System of Units
the quotient of de¯ by dm, where de¯ is the mean incremental
(SI) (The Modernized Metric System)
energyimpartedbyionizingradiationtomatterofincremen-
E456 Terminology Relating to Quality and Statistics
tal mass dm (see ICRU 33).
E706 Master Matrix for Light-Water Reactor PressureVes-
sel Surveillance Standards D 5 de¯ dm (1)
/
E722 Practice for Characterizing Neutron Energy Fluence
DISCUSSION— The discontinued unit for absorbed dose is the rad (1
Spectra in Terms of an Equivalent Monoenergetic Neutron
rad = 100 erg/g = 0.01 Gy). Absorbed dose is sometimes referred to
Fluence For Radiation-Hardness Testing of Electronics
simply as dose. For a photon source under conditions of charged
E910 Test Method forApplication andAnalysis of Helium particle equilibrium, the absorbed dose, D, may be expressed as
follows:
Accumulation Fluence Monitors for Reactor Vessel Sur-
veillance D5F· E· µ /r, (2)
en
2. Terminology
where:
2
F = particle fluence (particles/m ),
absorbed dose (D)—Quantity of ionizing radiation energy
E = energy of the ionizing radiation (J), and
2
impartedperunitmassofaspecifiedmaterial.TheSIunitof
µ /r = mass energy absorption coefficient (m /kg).
en
If bremsstrahlung production within the specified material is
1
negligible, the mass energy absorption coefficient (µ /r)is
ThisterminologyisunderthejurisdictionofASTMCommitteeE10onNuclear en
Technology and Applications and is the direct responsibility of Subcommittee equal to the mass energy transfer coefficient (µ /r), and
tr
E10.93 on Editorial.
absorbeddoseisequaltokermaif,inaddition,chargedparticle
Current edition approved Jan. 1, 2005. Published February 2005. Originally
equilibrium exists.
approved in 1963. Last previous edition approved in 1999 as E170–99.
2
Available from International Commission on Radiation Units and Measure-
˙
absorbed dose rate, D—the absorbed dose in a material per
ments (ICRU), 7910 Woodmont Ave., Suite 800, Bethesda, MD 20814.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or incremental time interval, that is, the quotient of d D by d t
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
(see ICRU Report 33).
Standards volume information, refer to the standard’s Document Summary page on
˙
the ASTM website. D 5dD/dt (3)
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E170–05
−1
SI unit: Gy·s . tron field less well characterized than a standard field but
accepted as a measurement reference by a community of
DISCUSSION—Theabsorbed-doserateisoftenspecifiedintermsofthe
users.
average value of D over longer time intervals, for example, in units of
−1 −1
standard neutron field—a permanent and reproducible neu-
Gy·min or Gy·h .
tron field with neutron fluence rate and energy spectra, and
accuracy—the closeness of agreement between a measure-
their associated spat
...
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