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ASTM E666-14
Standard Practice for Calculating Absorbed Dose From Gamma or X Radiation
Automaticky přeložený název:
Standardní praxe pro výpočet absorbované dávky od Gamma nebo rentgenového záření
NORMA vydána dne 1.1.2014
Informace o normě:
Označení normy: ASTM E666-14
Poznámka: NEPLATNÁ
Datum vydání normy: 1.1.2014
Kód zboží: NS-47586
Počet stran: 9
Přibližná hmotnost: 27 g (0.06 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Kategorie - podobné normy:
Anotace textu normy ASTM E666-14 :
Keywords:
calculation of absorbed dose, charged particle equilibrium, radiation dosimetry, ICS Number Code 17.240 (Radiation measurements)
Doplňující informace
| Significance and Use | ||||||
|
4.1 The absorbed dose is a more meaningful parameter than exposure for use in relating the effects of radiation on materials. It expresses the energy absorbed by the irradiated material per unit mass, whereas exposure is related to the amount of charge produced in air per unit mass. Absorbed dose, as referred to here, implies that the measurement is made under conditions of charged particle (electron) equilibrium (see 4.2 Different materials, when exposed to the same radiation field, absorb different amounts of energy. Using the techniques of this standard, charged particle equilibrium must exist in order to relate the absorbed dose in one material to the absorbed dose in another. Also, if the radiation is attenuated by a significant thickness of an absorber, the energy spectrum of the radiation will be changed, and it will be necessary to correct for this. 1.1 This practice presents a
technique for calculating the absorbed dose in a material from
knowledge of the radiation field, the composition of the material,
1.2 A method is given for
calculating the absorbed dose in a material from the knowledge of
the absorbed dose in another material exposed to the same radiation
field. The procedure is restricted to homogeneous materials
composed of the elements for which absorption coefficients have
been tabulated. All 92 natural elements are tabulated in
1.3 The results of this practice are
only valid if charged particle equilibrium exists in the material
and at the depth of interest. Thus, this practice is not applicable
for determining absorbed dose in the immediate vicinity of
boundaries between materials of widely differing atomic numbers.
For more information on this topic, see Practice E1249.
1.4 Energy transport computer codes1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
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| 2. Referenced Documents | ||||||
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Podobné normy:
Historická
1.2.2011
Historická
1.6.2011
Historická
1.2.2011
Historická
1.11.2010
Historická
1.1.2010
Historická
1.3.2010
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