ASTM-E666 2008

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E666-08 Standard Practice for Calculating Absorbed Dose From Gamma or X Radiation

Published By	Publication Date	Number of Pages
ASTM	2008	9

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Category: ASTM

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Description

ASTM E666-08

Historical Standard: Standard Practice for Calculating Absorbed Dose From Gamma or X Radiation

ASTM E666

Scope

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, (1-5) ^, and a related measurement. The procedure is applicable for X and gamma radiation provided the energy of the photons fall within the range from 0.01 to 20 MeV.

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 (2). It also requires some knowledge of the energy spectrum of the radiation field produced by the source under consideration. Generally, the accuracy of this method is limited by the accuracy to which the energy spectrum of the radiation field is known.

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 E 1249.

1.4 Energy transport computer codes exist that are formulated to calculate absorbed dose in materials more precisely than this method. To use these codes, more effort, time, and expense are required. If the situation warrants, such calculations should be used rather than the method described here.

1.5 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.

Keywords

calculation of absorbed dose; charged particle equilibrium; radiation dosimetry; Energy deposition–ionizing radiation; Gamma radiation–nuclear materials/applications; Threshold detectors–.01 MeV to 20 MeV; X-irradiation; Absorbed radiation dose; Calculating test values; Charged particle equilibrium; Dosimetry

ICS Code

ICS Number Code 17.240 (Radiation measurements)

DOI: 10.1520/E0666-08

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Significance and Use Calculation of Absorbed Dose Estimating the Absorbed Dose in One Material from That Measured in Another Material
3	Accuracy Keywords
4	X1. CHARGED PARTICLE EQUILIBRIUM DEPTH X1.1 X1.2 X1.3 X2. SAMPLE CALCULATION OF ABSORBED DOSE FOR BROAD PHOTON ENERGY SPECTRA X2.1 X2.2 FIG. X1.1 FIG. X2.1
5	X2.3 X2.4 FIG. X2.2 TABLE X2.1 TABLE X2.2
6	X3. SAMPLE CALCULATION OF ABSORBED DOSE FOR NEARLY MONOENERGETIC PHOTON ENERGY SPECTRA X3.1 X3.2 FIG. X2.3 TABLE X2.3
7	X4. BEAM ATTENUATION X4.1 X4.2 X4.3 X4.4 X4.5 X4.6 X5. EXPERIMENTAL JUSTIFICATION OF X5.1 X5.2 X5.3 X5.4
8	X6. DOSE CALCULATION X6.1 X6.2 REFERENCES FIG. X5.1