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ASTM-E1249:2010 Edition

ASTM-E1249:2010 Edition

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E1249-10 Standard Practice for Minimizing Dosimetry Errors in Radiation Hardness Testing of Silicon Electronic Devices Using Co-60 Sources

Published By Publication Date Number of Pages
ASTM 2010 16
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1.1 This practice covers recommended procedures for the use of dosimeters, such as thermoluminescent dosimeters (TLD’s), to determine the absorbed dose in a region of interest within an electronic device irradiated using a Co-60 source. Co-60 sources are commonly used for the absorbed dose testing of silicon electronic devices.

Note 1This absorbed-dose testing is sometimes called total dose testing to distinguish it from dose rate testing.

Note 2The effects of ionizing radiation on some types of electronic devices may depend on both the absorbed dose and the absorbed dose rate; that is, the effects may be different if the device is irradiated to the same absorbed-dose level at different absorbed-dose rates. Absorbed-dose rate effects are not covered in this practice but should be considered in radiation hardness testing.

1.2 The principal potential error for the measurement of absorbed dose in electronic devices arises from non-equilibrium energy deposition effects in the vicinity of material interfaces.

1.3 Information is given about absorbed-dose enhancement effects in the vicinity of material interfaces. The sensitivity of such effects to low energy components in the Co-60 photon energy spectrum is emphasized.

1.4 A brief description is given of typical Co-60 sources with special emphasis on the presence of low energy components in the photon energy spectrum output from such sources.

1.5 Procedures are given for minimizing the low energy components of the photon energy spectrum from Co-60 sources, using filtration. The use of a filter box to achieve such filtration is recommended.

1.6 Information is given on absorbed-dose enhancement effects that are dependent on the device orientation with respect to the Co-60 source.

1.7 The use of spectrum filtration and appropriate device orientation provides a radiation environment whereby the absorbed dose in the sensitive region of an electronic device can be calculated within defined error limits without detailed knowledge of either the device structure or of the photon energy spectrum of the source, and hence, without knowing the details of the absorbed-dose enhancement effects.

1.8 The recommendations of this practice are primarily applicable to piece-part testing of electronic devices. Electronic circuit board and electronic system testing may introduce problems that are not adequately treated by the methods recommended here.

1.9 This standard does not purport to address all of the safety problems, 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.

PDF Catalog

PDF Pages PDF Title
1 Scope
Referenced Documents
2 Terminology
Significance and Use
3 Description of Co-60 Sources
Factors Affecting Absorbed Dose Measurement
4 FIG. 1
5 Procedures for Minimizing Dosimetry Errors Due to Absorbed-Dose Enhancement
Minimum Information for Test Reports
Keywords
6 X1. TYPICAL60CO FACILITIES
X1.1
X1.2
X1.3
FIG. X1.1
7 FIG. X1.2
FIG. X1.3
8 FIG. X1.4
FIG. X1.5
9 FIG. X1.6
10 FIG. X1.7
FIG. X1.8
11 X2. ABSORBED-DOSE ENHANCEMENT EFFECTS
X2.1 General
X2.2 Low-Energy Photon Effects (Compton Scattering, Photoelectric Absorption and Electron Transport)
X2.3 High-Energy Photon Effects (Compton Scattering and Electron Transport)
TABLE X1.1
TABLE X1.2
12 X3. FACTORS INFLUENCING THE INCIDENT PHOTON ENERGY SPECTRUM
X3.1 Filters and Scatterers
X3.2 Walls
X3.3 Collimators
13 X4. MASS ENERGY ABSORPTION COEFFICIENTS
X4.1
X4.2
TABLE X4.1
14 X5. SUMMARY OF SOME CALCULATIONS AND MEASUREMENTS OF DOSIMETRY ERRORS IN Co-60 IRRADIATION OF ELECTRONIC DEVICES
X5.1 Measurement of Absorbed Dose Enhancement
FIG. X4.1
FIG. X5.1
15 X5.2 Measurement and Calculation of Absorbed Dose Enhancement Factors With and Without Spectrum Filtration
TABLE X5.1
TABLE X5.2
TABLE X5.3
TABLE X5.4
TABLE X5.5
16 REFERENCES

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