MIL- STD-883F 2004 TEST METHOD STANDARD MICROCIRCUITS.pdf - 第107页

MIL-STD-883F METHOD 1017.2 25 August 1983 1 METHOD 1017.2 NEUTRON IRRADIATION 1. PURPOSE . The neutr on irr adiation t est i s perf ormed to det ermine t he susc eptibi lit y of semi conduct or devic es to degradati on i…

MIL-STD-883F

METHOD 1016.1

18 June 2004

FIGURE 1016-3. Lognormal failure rates

TIME = MEDIAN LIFE, (T

)

MIL-STD-883F

METHOD 1017.2

25 August 1983

METHOD 1017.2

NEUTRON IRRADIATION

1. PURPOSE

. The neutron irradiation test is performed to determine the susceptibility of semiconductor devices to

degradation in the neutron environment. The tests described herein are applicable to integrated circuits, transistors, and

diodes. This is a destructive test. Objectives of the test are: (1) to detect and measure the degradation of critical

semiconductor device parameters as a function of neutron fluence, and (2) to determine if specified semiconductor device

parameters are within specified limits after exposure to a specified level of neutron fluence (see section 4).

2. APPARATUS

2.1 Test instruments

. Test instrumentation to be used in the radiation test shall be standard laboratory electronic test

instruments such as power supplies, digital voltmeters, and picoammeters, etc., capable of measuring the electrical

parameters required. Parameter test methods and calibration shall be in accordance with MIL-STD-883 or MIL-STD-750,

whichever is applicable.

2.2 Radiation source

. The radiation source used in the test shall be in a TRIGA Reactor or a Fast Burst Reactor.

Operation may be in either pulse or steady-state mode as appropriate. The source shall be one that is acceptable to the

acquiring activity.

2.3 Dosimetry equipment

a. Fast-neutron threshold activation foils such as

Fe, and

Ni.

b. CaF

thermoluminescence dosimeters (TLDs).

c. Appropriate activation foil counting and TLD readout equipment.

2.4 Dosimetry measurements

2.4.1 Neutron fluences

. The neutron fluence used for device irradiation shall be obtained by measuring

the amount of radioactivity induced in a fast-neutron threshold activation foil such as

Fe, or

Ni, irradiated

simultaneously with the device.

A standard method for converting the measured radioactivity in the specific activation foil employed into a neutron fluence is

given in the following Department of Defense adopted ASTM standards:

E263 - Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of

Iron.

E264 - Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of

Nickel.

E265 - Standard Test Method for Measuring Fast-Neutron Reaction Rates by Radioactivation of

Sulfur.

MIL-STD-883F

METHOD 1017.2

25 August 1983

The conversion of the foil radioactivity into a neutron fluence requires a knowledge of the neutron spectrum incident on the

foil. If the spectrum is not known, it shall be determined by use of the following DoD adopted ASTM standards, or their

equivalent:

E720 - Standard Guide for Selection of a Set of Neutron-Activation Foils for Determining Neutron Spectra

used in Radiation-Hardness Testing of Electronics.

E721 - Standard Method for Determining Neutron Energy Spectra with Neutron-Activation Foils for

Radiation-Hardness Testing of Electronics.

E722 - Standard Practice for Characterizing Neutron Energy Fluence Spectra in Terms of an Equivalent

Monoenergetic Neutron Fluence for Radiation-Hardness Testing of Electronics.

Once the neutron energy spectrum has been determined and the equivalent monoenergetic fluence calculated,

then an appropriate monitor foil (such as

Fe, or

Ni) should be used in subsequent irradiations to determine the

neutron fluence as discussed in E722. Thus, the neutron fluence is described in terms of the equivalent monoenergetic

neutron fluence per unit monitor response. Use of a monitor foil to predict the equivalent monoenergetic neutron fluence is

valid only if the energy spectrum remains constant.

2.4.2 Dose measurements

. If absorbed, dose measurements of the gamma-ray component during the device test

irradiations are required, then such measurements shall be made with CaF

thermoluminescence dosimeters (TLDs), or

their equivalent. These TLDs shall be used in accordance with the recommendations of the following DoD adopted ASTM

standard:

E668 - Standard Practice for the Application of Thermoluminescence-Dosimetry (TLD) Systems for

Determining Absorbed Dose in Radiation-Hardness Testing of Electronic Devices.

3. PROCEDURE

3.1 Safety requirements

. Neutron irradiated parts may be radioactive. Handling and storage of test specimens or

equipment subjected to radiation environments shall be governed by the procedures established by the local Radiation

Safety Officer or Health Physicist.

NOTE: The receipt, acquisition, possession, use, and transfer of this material after irradiation is subject to the regulations of

the U.S. Nuclear Regulatory Commission, Radioisotope License Branch, Washington, DC 20555. A by-product

license is required before an irradiation facility will expose any test devices. (U.S. Code, see 10 CFR 30-33.)

3.2 Test samples

. A test sample shall be randomly selected and consist of a minimum of 10 parts, unless otherwise

specified. All sample parts shall have met all the requirements of the governing specification for that part. Each part shall

be serialized to enable pre and post test identification and comparison.

3.3 Pre-exposure

3.3.1 Electrical tests

. Pre-exposure electrical tests shall be performed on each part as required. Where delta parameter

limits are specified, the pre-exposure data shall be recorded.

3.3.2 Exposure set-up

. Each device shall be mounted unbiased and have its terminal leads either all shorted or all open.

For MOS devices or any microcircuit containing an MOS element, all leads shall be shorted. An appropriate mounting

fixture which will accommodate both the sample and the required dosimeters (at least one actuation foil and one CaF

TLD)

shall be used. The configuration of the mounting fixture will depend on the type of reactor facility used and should be

discussed with reactor facility personnel. Test devices shall be mounted such that the total variation of fluence over the

entire sample does not exceed 20 percent. Reactor facility personnel shall determine both the position of the fixture and the

appropriate pulse level or power time product required to achieve the specified neutron fluence level.