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1.1 This guide covers recommended procedures for the use of X-ray testers (that is, sources with a photon spectrum having 10 keV mean photon energy and 50 keV maximum energy) in testing semiconductor discrete devices and integrated circuits for effects from ionizing radiation.

1.2 The X-ray tester may be appropriate for investigating the susceptibility of wafer level or delidded microelectronic devices to ionizing radiation effects. It is not appropriate for investigating other radiation-induced effects such as single-event effects (SEE) or effects due to displacement damage.

1.3 This guide focuses on radiation effects in metal oxide semiconductor (MOS) circuit elements, either designed (as in MOS transistors) or parasitic (as in parasitic MOS elements in bipolar transistors).

1.4 Information is given about appropriate comparison of ionizing radiation hardness results obtained with an X-ray tester to those results obtained with cobalt-60 gamma irradiation. Several differences in radiation-induced effects caused by differences in the photon energies of the X-ray and cobalt-60 gamma sources are evaluated. Quantitative estimates of the magnitude of these differences in effects, and other factors that should be considered in setting up test protocols, are presented.

1.5 If a 10-keV X-ray tester is to be used for qualification testing or lot acceptance testing, it is recommended that such tests be supported by cross checking with cobalt-60 gamma irradiations.

1.6 Comparisons of ionizing radiation hardness results obtained with an X-ray tester with results obtained with a LINAC, with protons, etc. are outside the scope of this guide.

1.7 Current understanding of the differences between the physical effects caused by X-ray and cobalt-60 gamma irradiations is used to provide an estimate of the ratio (number-of-holes-cobalt-60)/(number-of-holes-X-ray). Several cases are defined where the differences in the effects caused by X-rays and cobalt-60 gammas are expected to be small. Other cases where the differences could potentially be as great as a factor of four are described.

1.8 It should be recognized that neither X-ray testers nor cobalt-60 gamma sources will provide, in general, an accurate simulation of a specified system radiation environment. The use of either test source will require extrapolation to the effects to be expected from the specified radiation environment. In this guide, we discuss the differences between X-ray tester and cobalt-60 gamma effects. This discussion should be useful as background to the problem of extrapolation to effects expected from a different radiation environment. However, the process of extrapolation to the expected real environment is treated elsewhere (1, 2).2

1.9 The time scale of an X-ray irradiation and measurement may be much different than the irradiation time in the expected device application. Information on time-dependent effects is given.

1.10 Possible lateral spreading of the collimated X-ray beam beyond the desired irradiated region on a wafer is also discussed.

1.11 Information is given about recommended experimental methodology, dosimetry, and data interpretation.

1.12 Radiation testing of semiconductor devices may produce severe degradation of the electrical parameters of irradiated devices and should therefore be considered a destructive test.

1.13 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.14 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.15 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

 

Document History

  1. ASTM F1467-18

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    Standard Guide for Use of an X-Ray Tester (≈10 keV Photons) in Ionizing Radiation Effects Testing of Semiconductor Devices and Microcircuits

    • Most Recent
  2. ASTM F1467-11


    Standard Guide for Use of an X-Ray Tester (approximately 10 keV Photons) in Ionizing Radiation Effects Testing of Semiconductor Devices and Microcircuits

    • Historical Version
  3. ASTM F1467-99(2005)e1


    Standard Guide for Use of an X-Ray Tester ([approximate]10 keV Photons) in Ionizing Radiation Effects Testing of Semiconductor Devices and Microcircuits

    • Historical Version
  4. ASTM F1467-99(2005)


    Standard Guide for Use of an X-Ray Tester ([approximate]10 keV Photons) in Ionizing Radiation Effects Testing of Semiconductor Devices and Microcircuits

    • Historical Version
  5. ASTM F1467-99


    Standard Guide for Use of an X-Ray Tester ([approximate]10 keV Photons) in Ionizing Radiation Effects Testing of Semiconductor Devices and Microcircuits

    • Historical Version