PUBLICATIONS I A11107 257755

ML

NBS SPECIAL PUBLICATION 260-92

U.S. DEPARTMENT OF COMMERCE/National Bureau of Standards

Standard Reference Materials:

Calibrated Glass Standards

for Fission Track Use

100

U57

Mo. 260-92

1934
Tm he National Bureau of Standards' was established by an act of Congress on March 3, 1901. The M Bureau's overall goal is to strengthen and advance the nation's science and technology and facilitate their effective application for public benefit. To this end, the Bureau conducts research and provides: (1) a

basis for the nation's physical measurement system, (2) scientific and technological services for industry and

government, (3) a technical basis for equity in trade, and (4) technical services to promote public safety. The Bureau's technical work is performed by the National Measurement Laboratory, the National Engineering Laboratory, the Institute for Computer Sciences and Technology, and the Center for Materials

Science.

The National Measurement Laboratory

Provides the national system of physical and chemical measurement;

coordinates the system with measurement systems of other nations and

furnishes essential services leading to accurate and uniform physical and

chemical measurement throughout the Nation's scientific community, in- dustry, and commerce; provides advisory and research services to other Government agencies; conducts physical and chemical research; develops, produces, and distributes Standard Reference 'Materials; and provides

calibration services. The Laboratory consists of the following centers:

Basic Standards

Radiation Research Chemical Physics

Analytical Chemistry

The National Engineering Laboratory

Provides technology and technical services to the public and private sectors to address national needs and to solve national problems; conducts research in engineering and applied science in support of these efforts; builds and maintains competence in the necessary disciplines required to carry out this research and technical service; develops engineering data and measurement

capabilities; provides engineering measurement traceability services; develops

test methods and proposes engineering standards and code changes; develops and proposes new engineering practices; and develops and improves mechanisms to transfer results of its research to the ultimate user. The

Laboratory consists of the following centers:

Applied Mathematics

Electronics and Electrical Engineering2 Manufacturing Engineering

Building Technology

Fire Research Chemical Engineering2

The Institute for Computer Sciences and Technology

Conducts research and provides scientific and technical services to aid Federal agencies in the selection, acquisition, application, and use of computer technology to improve effectiveness and economy in Government

operations in accordance with Public Law 89-306 (40 U.S.C. 759), relevant Executive Orders, and other directives; carries out this mission by managing

the Federal Information Processing Standards Program, developing Federal ADP standards guidelines, and managing Federal participation in ADP

voluntary standardization activities; provides scientific and technological advisory services and assistance to Federal agencies; and provides the technical foundation for computer-related policies of the Federal Government. The Institute consists of the following centers:

Programming Science and

Technology Computer Systems

Engineering

The Center for Materials Science

Conducts research and provides measurements, data, standards, reference

materials, quantitative understanding and other technical information funda- mental to the processing, structure, properties and performance of materials; addresses the scientific basis for new advanced materials technologies; plans

research around cross-country scientific themes such as nondestructive

evaluation and phase diagram development; oversees Bureau-wide technical programs in nuclear reactor radiation research and nondestructive evaluation; and broadly disseminates generic technical information resulting from

its programs. The Center consists of the following Divisions:

Inorganic Materials Fracture and Deformation

Polymers

Metallurgy Reactor Radiation

'Headquarters and Laboratories at Gaithersburg, MD, unless otherwise noted; mailing address Gaithersburg, MD 20899.

2 Some divisions within the center are located at Boulder, CO 80303. 'Located at Boulder, CO, with some elements at Gaithersburg, MD.
Standard Reference Materials:

Calibrated Glass Standards for Fission

Track Use (Supplement to NBS SP 260-49)

B. Stephen Carpenter

National Measurement Laboratory

National Bureau of Standards

Gaithersburg, MD 20899

U.S. DEPARTMENT OF COMMERCE, Malcolm Baldrige, Secretary

NATIONAL BUREAU OF STANDARDS, Ernest Ambler, Director Issued September 1984

dC(Ob

. U £T>C
Library of Congress Catalog Card Number: 84-601112

National Bureau of Standards Special Publication 260-92

Natl. Bur. Stand. (U.S.), Spec. Publ. 260-92, 21 pages (Sept. 1984)

CODEN: XNBSAV

U.S. GOVERNMENT PRINTING OFFICE

WASHINGTON: 1984 For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402
PREFACE

Standard Reference Materials (SRM's) as defined by the National Bureau of Standards are "well -characterized materials,

produced in quantity, that calibrate a measurement system to assure compatibility of measurement in the Nation." SRM's

are widely used as primary standards in many diverse fields of science, industry, and technology, both within the United States and throughout the world. For many of the Nation's scientists and technologists it is of more than passing interest to know the measurements obtained and methods used by the analytical community when analyzing SRM's.

An NBS series of papers, of which this publication is a member, called the NBS Special Publication - 260 Series is reserved for this purpose.

This 260 Series is dedicated to the dissemination of information on all phases of the preparation, measurement, and certification of NBS SRM's. In general, more detail will be found in these papers than is generally allowed, or desirable, in scientific journal articles. This enables the user the assess the validity and accuracy of the measurement processes employed, to judge the statistical analysis, and to learn details of techniques and methods utilized for work entailing the greatest care and accuracy. It is also hoped that these papers will provide sufficient additional information not found on the certificate so that new applications in diverse fields not foreseen at the time the SRM

was originally issued will be sought and found. Inquiries concerning the technical content of this paper should be directed to the author. Other questions concerned

with the availability, delivery, price of specific SRM's should be addressed to: Office of Standard Reference Materials

National Bureau of Standards Gaithersburg, MD 20899

Stanley D. Rasberry, Chief Office of Standard Reference Materials
OTHER NBS PUBLICATIONS IN THIS SERIES

Catalog of NBS Standard Reference Materials

(1984-85 edition), Catherine H. Hudson, ed , NBS

Spec. Publ. 260 (February 1984). Michaelis, R. E., and Wyman, L. L. Standard

Reference Materials: Preparation of White Cast

Iron Spectrochemical Standards. NBS Misc. Publ. 260-1 (June 1964). COM74-1 1061 **

Michaelis, R. E., Wyman, L. L., and Flitsch, R., Standard Reference Materials: Preparation of NBS Copper-Base Spectrochemical Standards. NBS Misc. Publ. 260-2 (October 1964). COM74-

1 1063**

Michaelis, R. E., Yakowitz, H., and Moore, G. A., Standard Reference Materials: Metallographic

Characterization of an NBS Spectrometric LowAlloy Steel Standard. NBS Misc. Publ. 260-3 (October 1964). COM74-1 1060** Hague, J. L. Mears, T. W., and Michaelis, R. E., Standard Reference Materials: Sources of

Information, NBS Misc. Publ. 260-4 (February

1965). COM74- 11059

Alvarez, R., and Flitsch R„ Standard Reference

Materials: Accuracy of Solution X-Ray Spectrometric Analysis of Copper-Base Alloys. NBS

Misc. Publ. 260-5 (March 1965). PB168068**

Shultz, J. L, Standard Reference Materials: Methods for the Chemical Analysis of White

Cast Iron Standards, NBS Misc. Publ. 260-6

(July 1965). COM74-11068**

Bell, R. K., Standard Reference Materials: Methods for the Chemical Analysis of NBS

Copper-Base Spectrochemical Standards. NBS

Misc. Publ. 260-7 (October 1965). COM74-

11067** Richmond, M.S., Standard Reference Materials: Analysis of Uranium Concentrates at the

National Bureau of Standards. NBS Misc. Publ. 260-8 (December 1965). COM74-1 1066** Anspach, S. C, Cavallo, L. M. Garfinkel, S. B. Hutchinson, J. M. R., and Smith, C. N., Standard Reference Materials: Half Lives of Materials Used in the Preparation of Standard Reference Materials of Nineteen Radioactive Nuclides

Issued by the National Bureau of Standards NBS Misc. Publ. 260-9 (November !965). COM74-11065**

Yakowitz, H., Vieth, D. L., Heinrich, K. F. J., and

Michaelis, R. E., Standard Reference Materials: Homogeneity Characterization of NBS Spectrometric Standards II: Cartridge Brass and LowAlloy Steel, NBS Misc. Publ. 260-10 (December

1965). COM74-11064**

Napolitano, A., and Hawkins, E. G., Standard Reference Materials: Viscosity of Standard

Lead-Silica Glass, NBS Misc. Publ. 260-11 (November 1966). NBS Misc. Publ. 260-11** Yakowitz, H., Vieth, D. L., and Michaelis, R. E., Standard Reference Materials: Homogeneity

Characterization of NBS Spectrometric Standards III: White Cast Iron and Stainless Steel Powder Compact, NBS Misc. Publ. 260-12

(September 1966). NBS Misc. Publ. 260-12**

Spijkerman, J. L., Snediker, D. K., Ruegg, F. C,

and DeVoe, J. R., Standard Reference Materials: Mossbauer Spectroscopy Standard for the Chemical Shift of Iron Compounds, NBS Misc. Publ. 260-13 (July 1967). NBS Misc. Publ.

260-13**

Menis, O., and Sterling, J. T., Standard Reference

Materials: Determination of Oxygen in Ferrous

Materials - SRM 1090, 1091, and 1092, NBS

Misc. Publ. 260-14 (September 1966). NBS Misc.

Publ. 260-14**

Passaglia, E., and Shouse, P. J., Standard Refer- ence Materials: Recommended Method of Use

of Standard Light-Sensitive Paper for Calibrat- ing Carbon Arcs Used in Testing Textiles for Colorfastness to Light, NBS Misc. Publ. 260-15 (June 1967). (Replaced by NBS Spec. Publ.

260-41.) Yakowitz, H., Michaelis, R. E., and Vieth, D. L., Standard Reference Materials: Homogeneity

Characterization of NBS Spectrometric Standards IV: Preparation and Microprobe Characterization of W-20% MO Alloy Fabricated by Powder Metallurgical Methods, NBS Spec.

Publ. 260-16 (January 1969). COM74-1 1062** Catanzaro, E. J., Champion, C. E., Garner, E. L., Marinenko, G., Sappenfield, K. M., and Shields, W. R., Standard Reference Materials: Boric

Acid; Isotopic and Assay Standard Reference

Materials, NBS Spec. Publ. 260-17 (February

1970). Out of Print. Geller, S. B., Mantek, P.A., and Cleveland, N. G., Standard Reference Materials: Calibration of NBS Secondary Standard Magnetic Tape (Computer Amplitude Reference) Using the Reference Tape Amplitude Measurement

"Process A," NBS Spec. Publ. 260-18 (November

1969). (See NBS Spec. Publ. 260-29.) Paule, R. C, and Mandel, J., Standard Reference

Materials: Analysis of Interlaboratory Measure- ments on the Vapor Pressure of Gold (Certifica- tion of Standard Reference Material 745). NBS

Spec. Publ. 260-19 (January 1970). PB190071**

Paule, R. C, and Mandel, J., Standard Reference

Materials: Analysis of Interlaboratory Measure- ments on the Vapor Pressures of Cadmium and

Silver, NBS Spec. Publ. 260-21 (January 1971). COM74-11359**

Yakowitz, H., Fiori, C. E., and Michaelis, R. E., Standard Reference Materials: Homogeneity

Characterization of Fe-3 Si Alloy, NBS Spec.

Publ. 260-22 (February 1971). COM74-1 1357**

Napolitano, A., and Hawkins, E. G., Standard

Reference Materials: Viscosity of a Standard

Borosilicate Glass, NBS Spec. Publ. 260-23 (December 1970). COM7I-001 57**

Sappenfield, K. M., Marineko, G., and Hague, J. L., Standard Reference Materials: Comparison

of Redox Standards, NBS Spec. Publ. 260-24 (January 1972). COM72-50058**

iv
Hicho, G. E., Yakowitz, H., Rasberry, S. D., and

Michaelis, R. E., Standard Reference Materials: A Standard Reference Material Containing

Nominally Four Percent Austenite, NBS Spec.

Publ. 260-25 (February 1971). COM74-1 1356** Martin, J. F., Standard Reference Materials:

National Bureau of Standards-US Steel Corporation Joint Program for Determining Oxygen and Nitrogen in Steel, NBS Spec. Publ. 260-26

(February 1971). 85 cents* PB 81176620

Garner, E. L., Machlan, L. A., and Shields, W. R., Standard Reference Materials: Uranium

Isotopic Standard Reference Materials, NBS

Spec. Publ. 260-27 (April 1971). COM74-

11358**

Heinrich, K. F. J., Myklebust, R. L., Rasberry, S. D., and Michaelis, R. E., Standard Reference Materials: Preparation and Evaluation of SRM's 481 and 482 Gold-Silver and GoldCopper Alloys for Microanalysis, NBS Spec.

Publ. 260-28 (August 1971). COM71-50365**

Geller, S. B., Standard Reference Materials: Cali- bration of NBS Secondary Standard Magnetic Tape (Computer Amplitude Reference) Using

the Reference Tape Amplitude Measurement

"Process A-Model 2," NBS Spec. Publ. 260-29 (June 1971). COM71-50282

Gorozhanina, R. S., Freedman, A. Y., and

Shaievitch, A. B. (translated by M. C. Selby), Standard Reference Materials: Standard

Samples Issued in the USSR (A Translation from the Russian). NBS Spec. Publ. 260-30 (June

1971). COM71-50283**

Hust, J. G., and Sparks, L. L., Standard Reference

Materials: Thermal Conductivity of Electrolytic Iron SRM 734 from 4 to 300 K, NBS Spec. Publ. 260-31 (November 1971). COM7 1-50563** Mavrodineanu, R., and Lazar, J. W., Standard

Reference Materials: Standard Quartz Cuvettes,

for High Accuracy Spectrophotometry, NBS

Spec. Publ. 260-32 (December 1973). 55 cents* SN003-003-01213-1 Wagner, H. L., Standard Reference Materials: Comparison of Original and Supplemental SRM 705, Narrow Molecular Weight Distri- bution Polystyrene, NBS Spec. Publ. 260-33 (May 1972). COM72-50526**

Sparks, L. L., and Hust, J. G., Standard Reference

Materials: Thermoelectric Voltage, NBS Spec.

Publ. 260-34, (April 1972). COM72-50371**

Sparks, L. L., and Hust, J. G., Standard Refer- ence Materials: Thermal Conductivity of

Austenitic Stainless Steel, SRM 735 from 5 to 280 K, NBS Spec. Publ. 260-35 (April 1972.) 35 cents* COM72-50368**

Cali, J. P., Mandel, J., Moore, L. J., and Young, D.

S., Standard Reference Materials: A Referee Method for the Determination of Calcium in Serum, NBS SRM 915, NBS Spec. Publ. 260-36 (May 1972). COM72-50527**

Shultz, J. I. Bell., R. EC. Rains, T. C, and Menis,

O., Standard Reference Materials: Methods of Analysis of NBS Clay Standards, NBS Spec.

Publ. 260-37 (June 1972). COM72-50692**

Richmond, J. C, and Hsia, J. J., Standard Refer- ence Materials: Preparation and Calibration of Standards of Spectral Specular Reflectance, NBS Spec. Publ. 260-38 (May 1972). COM72-

50528**

Clark, A. F., Denson, V.A., Hust, J. G., and

Powell, R. L., Standard Reference Materials: The Eddy Current Decay Method for Resistivity Characterization of High-Purity Metals, NBS

Spec. Publ. 260-39 (May 1972). COM72-50529** McAdie, H. G., Gam, P.D., and Menis, O, Standard Reference Materials: Selection of Thermal

Analysis Temperature Standards Through a Cooperative Study (SRM 758, 759, 760), NBS

Spec. Publ. 260-40 (August 1972.) COM72-

50776** Wood, L. A., and Shouse, P. J., Standard

Reference Materials: Use of Standard LightSensitive Paper for Calibrating Carbon Arcs Used in Testing Textiles for Colorfastness to

Light, NBS Spec. Publ. 260-41 (August 1972) COM72-50775**

Wagner, H. L. and Verdier, P. H., eds., Standard

Reference Materials: The Characterization of Linear Polyethylene, SRM 1475, NBS Spec. Publ. 260-42 (September 1972). COM72-

50944**

Yakowitz, H., Ruff, A. W., and Michaelis, R. E., Standard Reference Materials: Preparation and Homogeneity Characterization of an Austenitic Iron-Chromium-Nickel Alloy, NBS Spec. Publ. 260-43 (November 1972). COM73-50760**

Schooley, J. F., Soulen, R. J., Jr., and Evans, G. A.,

Jr., Standard Reference Materials: Preparation and Use of Superconductive Fixed Point

Devices, SRM 767, NBS Spec. Publ. 260-44 (December 1972). COM73-50037**

Greifer, B., Maienthal, E. J., Rains, T. C, and

Rasberry, S. D., Standard Reference Materials: Powdered Lead-Based Paint, SRM 1579, NBS

Spec. Publ. 260-45 (March 1973). COM73-

50226**

Hust, J. G., and Giarratano, P. J., Standard Refer- ence Materials: Thermal Conductivity and

Electrical Resistivity Standard Reference Materials: Austenitic Stainless Steel, SRM's 735 and

798, from 4 to 1200 K, NBS Spec. Publ. 260-46 (March 1975). SN003-003-0 1278-5*

Hust, J. G., Standard Reference Materials: Electrical Resistivity of Electrolytic Iron, SRM 797, and Austenitic Stainless Steel, SRM 798, from 5 to 280 K, NBS Spec. Publ. 260-47 (February

1974). COM74-50176** Mangum, B. W., and Wise, J. A., Standard Refer- ence Materials: Description and Use of Precision Thermometers for the Clinical Laboratory, SRM 933 and SRM 934, NBS Spec. Publ. 260-48 (May 1974). 60 cents* SN003-003-0 1278-5 Carpenter, B. S., and Reimer, G. M., Standard

Reference Materials: Calibrated Glass Standards for Fission Track Use, NBS Spec. Publ. 260-49 (November 1974). COM74-51I85

V
Hust, J. G., and Giarratano, P. J., Standard Refer- ence Materials: Thermal Conductivity and Electrical Resistivity Standard Reference Materials:

Electrolytic Iron, SRM's 734 and 797 from 4 to 1000 K, NBS Spec. Publ. 260-50 (June 1975). $1.00* SN003-003-0 1425-7 Mavrodineanu, R., and Baldwin, J. R., Standard

Reference Materials: Glass Filters As a Standard Reference Material for Spectrophotometry;

Selection; Preparation; Certification; Use-SRM

930, NBS Spec. Publ. 260-51 (November 1975). $1.90* SN003-003-01481-8

Hust, J. G., and Giarratano, P. J., Standard Refer- ence Materials: Thermal Conductivity and Electrical Resistivity Standard Reference Materials 730 and 799, from 4 to 3000 K, NBS Spec. Publ. 260-52 (September 1975). $1.05* SN003-003-

01464-8 Durst, R. A., Standard Reference Materials: Standardization of pH Measurements, NBS

Spec. Publ. 260-53 (December 1975, Revised). $1.05 SN003-003-0155I-2

Burke, R. W., and Mavrodineanu, R., Standard

Reference Materials: Certification and Use of Acidic Potassium Dichromate Solutions as an

Ultraviolet Absorbance Standard, NBS Spec.

Publ. 260-54 (August 1977). $3.00* SN003-003-

01828-7

Ditmars, D. A., Cezairliyan, A., Ishihara, S., and

Douglas, T. B., Standard Reference Materials: Enthalpy and Heat Capacity; Molybdenum SRM 781, from 273 to 2800 K, NBS Spec. Publ. 260-55 (September 1977). $2.20* SN003-003-

01836-8

Powell, R. L., Sparks, L. L., and Hust, J. G., Standard Reference Materials: Standard

Thermocouple Materials, Pt.67: SRM 1967, NBS

Spec. Publ. 260-56 (February 1978). $2.20* SN003-003-0 18864

Cali, J. P. and Plebanski, T, Guide to United

States Reference Materials, NBS Spec. Publ. 260-57 (February 1978). $2.20* PB 277173

Barnes, J. D., and Martin, G. M., Standard Refer- ence Materials: Polyester Film for Oxygen Gas

Transmission Measurements SRM 1470, NBS

Spec. Publ. 260-58 (June 1979) $2.00* SN003-

003-02077 Chang, T., and Kahn, A. H. Standard Reference

Materials: Electron Paramagnetic Resonance

Intensity Standard; SRM 2601, NBS Spec.

Publ. 260-59 (August 1978) $2.30* SN003-

003-01975-5 Velapoldi, R. A., Paule, R. C, Schaffer, R., Mandel, J., and Moody, J. R., Standard Refer- ence Materials: A Reference Method for the Determination of Sodium in Serum, NBS Spec.

Publ. 260-60 (August 1978). $3.00* SN003-003

01978-0

Verdier, P. H., and Wagner. H. L., Standard Refer- ence Materials: The Characterization of Linear Polyethylene (SRM 1482, 1483, 1484), NBS

Spec. Publ. 260-61 (December 1978). $1.70* SN003-003-02006-1

Soulen, R. J., and Dove, R. B., Standard Reference

Materials: Temperature Reference Standard

for Use Below 0.5 K (SRM 768). NBS Spec.

Publ. 260-62 (April 1979). $2.30* SN003-003-

02047-8 Velapoldi, R. A., Paule, R. C, Schaffer, R. Mandel, J., Machlan, L. A., and Gramlich, J. W., Standard Reference Materials: A Reference Method for the Determination of Potassium in Serum. NBS Spec. Publ. 260-63 (May 1979). $3.75* SN003-003-02068

Velapoldi, R. A., and Mielenz, K. D., Standard

Reference Materials: A Fluorescence Standard

Reference Material Quinine Sulfate Dihydrate (SRM 936), NBS Spec. Publ. 260-64 (January

1980). $4.25* SN003-003-02 148-2 Marinenko, R. B., Heinrich, K. F. J., and Ruegg,

F. C, Standard Reference Materials: Micro- Homogeneity Studies of NBS Standard Reference

Materials, NBS Research Materials, and Other Related Samples. NBS Spec. Publ. 260-65

(September 1979). $3.50* SN003-003-021 14-1 Venable, W. H., Jr., and Eckerle, K. L., Standard

Reference Materials: Didymium Glass Filters for Calibrating the Wavelength Scale of Spectro- photometers (SRM 2009, 2010, 2013). NBS Spec. Publ. 260-66 (October 1979). $3.50* SN003-003-

02127-0

Velapoldi, R. A., Paule, R. C, Schaffer, R., Mandel,

J., Murphy, T. J., and Gramlich, J. W., Standard

Reference Materials: A Reference Method for the Determination of Chloride in Serum, NBS Spec. Publ. 260-67 (November 1979). $3.75* SN003-

003-02136-9 Mavrodineanu, R. and Baldwin, J. R., Standard

Reference Materials: Metal-On-Quartz Filters as a Standard Reference Material for Spectrophoto- metry-SRM 2031, NBS Spec. Publ. 260-68

(April 1980). $4.25* SN003-003-02 167-9 Velapoldi, R. A., Paule, R. C, Schaffer, R., Mandel, J., Machlan, L. A., Garner, E. L., and

Rains, T. C, Standard Reference Materials: A

Reference Method for the Determination of Lithium in Serum, NBS Spec. Publ. 260-69 (July)

1980). $4.25* SN003-003-02214-4 Marinenko, R. B., Biancaniello, F., Boyer, P. A., Ruff, A. W., DeRobertis, L., Standard Reference

Materials: Preparation and Characterization of an Iron-Chromium-Nickel Alloy for Microanalysis, NBS Spec. Publ. 260-70 (May 1981). $2.50* SN003-003-02328-1 Seward, R. W., and Mavrodineanu, R., Standard

Reference Materials: Summary of the Clinical Laboratory Standards Issued by the National Bureau of Standards, NBS Spec. Publ. 260-71 (November 1981). $6.50* SN003-003-02381-7

Reeder, D.J., Coxon, B., Enagonio, D., Christensen, R. G., Schaffer, R., Howell, B. F., Paule, R. C,

Mandel, J., Standard Reference Materials: SRM

900, Antiepilepsy Drug Level Assay Standard, NBS Spec. Publ. 260-72 (June 1981). $4.25* SN003-003-02329-9
Interrante, C. G., and Hicho, G. E., Standard Refer- ence Materials: A Standard Reference Material Containing Nominally Fifteen Percent Austenite (SRM 486), NBS Spec. Publ. 260-73 (January

1982). $2.75* SN003-003-02386-8 Marinenko, R. B., Standard Reference Materials: Preparation and Characterization of K-411 and

K-414 Mineral Glasses for Microanalysis: SRM

470. NBS Spec. Publ. 260-74 (April 1982). $3.50 SN003-003-023-95-7

Weidner, V. R., and Hsia, J. J., Standard Reference

Materials: Preparation and Calibration of First Surface Aluminum Mirror Specular Reflectance Standards (SRM 2003a), NBS Spec. Publ. 260-75 (May 1982). $3.75 SN003-003-023-99-0

Hicho, G. E. and Eaton, E. E., Standard Reference Materials: A Standard Reference Material

Containing Nominally Five Percent Austenite (SRM 485a), NBS Spec. Publ. 260-76 (August

1982). $3.50 SN003-003-024-33-3 Furukawa, G. T., Riddle, J. L., Bigge, W. G., and

Pfieffer, E. R., Standard Reference Materials: Application of Some Metal SRM's as Thermometric Fixed Points, NBS Spec. Publ. 260-77 (August 1982). $6.00 SN003-003-024-34-1

Hicho, G. E. and Eaton, E. E., Standard Reference

Materials: Standard Reference Material Containing Nominally Thirty Percent Austenite (SRM

487), NBS Spec. Publ. 260-78 (September 1982). $3.75* SN003-003-024-35-0 Richmond, J. C, Hsia, J. J. Weidner, V. R., and

Wilmering, D. B., Standard Reference Materials: Second Surface Mirror Standards of Specular

Spectral Reflectance (SRM's 2023, 2024, 2025), NBS Spec. Publ. 260-79 (October 1982). $4.50* SN003-003-024-47-3

Schaffer, R., Mandel, J., Sun, T., Cohen, A., and

Hertz, H. S., Standard Reference Materials: Evaluation by an ID/ MS Method of the AACC

Reference Method for Serum Glucose, NBS

Spec. Publ. 260-80 (October 1982). $4.75* SN003-

003-024-43-1 Burke, R. W., and Mavrodineanu, R. (NBS retired). Standard Reference Materials: Accuracy in Analytical Spectrophotometry, NBS Spec. Publ. 260-81 (April 1983). $6.00* SN003-003-024-84-8

Weidner, V. R., Standard Reference Materials: White Opal Glass Diffuse Spectral Reflectance Standards for the Visible Spectrum (SRM's 2015 and 2016). NBS Spec. Publ. 260-82 (April 1983). $3.75* SN003-003-024-89-9**

Bowers, G. N., Jr., Alvarez, R., Cali, J. P. (NBS

retired), Eberhardt, K. R., Reeder, D. J., Schaffer, R., Uriano, G. A., Standard Reference

Materials: The Measurement of the Catalytic

(Activity) Concentration of Seven Enzymes in NBS Human Serum SRM 909, NBS Spec.

Publ. 260-83 (June 1983). $4.50* SN003-003-024-

99-6

Gills, T. E., Seward, R. W., Collins, R. J., and

Webster, W. C, Standard Reference Materials: Sampling, Materials Handling, Processing, and Packaging of NBS Sulfur in Coal Standard

Reference Materials, 2682, 2683, 2684, and 2685, NBS Spec. Publ. 260-84 (August 1983). $4.50* SN003-003-025-20-8

Swyt, D. A., Standard Reference Materials: A Look

at Techniques for the Dimensional Calibration of Standard Microscopic Particles, NBS Spec. Publ. 260-85 (September 1983). $5.50* SN003-003-

025-21-6 Hicho, G. E. and Eaton, E. E., Standard Reference Materials: A Standard Reference Material

Containing Two and One-Half Percent Austenite, SRM 488, NBS Spec. Publ. 260-86 (December

1983). $1.75* SN003-003-025-41-1 Mangum, B. W., Standard Reference Materials: SRM 1969: Rubidium Triple-Point - A Temperature Reference Standard Near 39.30 °C, NBS

Spec. Publ. 260-87 (December 1983). $2.25* SN003-003-025-44-5 Gladney, E. S., Burns, C. E., Perrin, D. R., Roelandts, I., and Gills, T. E., Standard Reference

1982 Compilation of Elemental Concentration Data for NBS Biological, Geological, and

Environmental Standard Reference Materials. NBS Spec. Publ. 260-88 (March 1984). SN003-

003-02565-8

Hust, J. G., Standard Reference Materials: A Fine- Grained, Isotropic Graphite for Use as NBS

Thermophysical Property RM's from 5 to 2500 K, NBS Spec. Publ. 260-89 (In Press). Hust, J. G., and Lankford, A. B., Standard Reference Materials: Update of Thermal

Conductivity and Electrical Resistivity of

Electrolytic Iron, Tungsten, and Stainless Steel, NBS Spec. Publ. 260-90 (In Press). Goodrich, L. F., Vecchia, D. F., Pittman, E. S., Ekin, J. W., and Clark, A. F., Standard Reference

Materials: Critical Current Measurements on an NbTi Superconducting Wire Standard Reference

Material, NBS Spec. Publ. 260-91 (In Press). Carpenter, B. S., Standard Reference Materials: Calibrated Glass Standards for Fission Track Use (Supplement to NBS Spec. Publ. 260-49). NBS

Spec. Publ. 260-92 (In Press).

* Send order with remittance to Superintendent

of Documents, US Government Printing Office Washington, DC 20402. Remittance from

foreign countries should include an additional one-fourth of the purchase price for postage. ** May be ordered from: National Technical Information Services (NTIS). Springfield

Virginia 22151.
CONTENTS

PAGE

I. INTRODUCTION 1 II. CHARACTERIZATION OF THE GLASS STANDARDS 1 III. CERTIFICATION AND PACKAGE DESCRIPTION 1 IV. PREPARATION AND IRRADIATION PROCEDURES 2 V. FLUENCE DETERMINATION 2 VI. RECOMMENDED USE OF STANDARD REFERENCE MATERIALS 3 VII. ACKNOWLEDGEMENT 3 VIII. REFERENCES 4

LIST OF TABLES

Table No. 235

I. The Uranium Concentration U Isotopic Abundance 5 II. Concentration of Elements That May Cause Track Interferences 5 III. Activation Energies for Track Fading in the NBS Standard Glasses 6 IV. Approximate Track Densities 6

V. SRM 962a Fission Track Glass Standard 7 VI. SRM 963a Fission Track Glass Standard 8

LIST OF FIGURES

PAGE

Figure I. Annealing studies of uranium fission tracks in the 50 ppm SRM 962a. Extra- polation of the data on this Arrhenius plot indicates that glasses used as track references should be stored in a cool place in order to prevent partial annealing of tracks 9 Figure II. Position of RT-3 and RT-4 irradiated glasses and the four unirradiated glasses

(UG) within SRM package 10 Figure III. Arrangement of the glass, metal foils and detectors during neutron irradiation . . 11 Figure IV. Neutron cross sections for copper, gold, and cobalt as a function of neutron energy 12

viii
CALIBRATED GLASS STANDARDS FOR FISSION TRACK USE-SUPPLEMENT

B. Stephen Carpenter

National Measurement Laboratory

National Bureau of Standards Gaithersburg, MD 20899

Two glasses of different uranium concentrations were prepared and reissued for certification by the National Bureau of Standards as standards for use as neutron monitors to aid fission track studies. These Standard Reference Materials

(SRM's) and their uranium concentrations are: SRM 962a (37.4 ppm) and SRM 963a (0.823 ppm) . These glass wafers were

irradiated in the National Bureau of Standards Research Reactor and the neutron fluence was monitored using copper and gold foils, as well as an iron-cobalt foil.

Key Words: Fission tracks; flux monitors; glass standards; Standard Reference Material; thermal neutron irradiation;

uranium.

I. INTRODUCTION

The fission track technique has become an accepted and widely used method for uranium analysis and radiometric dating

in many laboratories. Therefore, the need exists for a primary standard to enable correlation of inter-laboratory

results. In order to fulfill this need, the National Bureau of Standards (NBS), through the Office of Standard Refer- ence Materials, has prepared and reissued for certification Fission Track Glass Standards, SRM" s 962a and 963a, t (1,2). Although these are not the first standards prepared for fission track work (2,3,4), they are the first readily available fission track standards for monitoring neutron fluence during irradiations and for comparing' track densities.

Since the glasses have some inadequacies which will be discussed, they are not the "ideal" standards; they are, however,

the best standards available at this time.

II. CHARACTERIZATION OF THE GLASS STANDARDS

The Fission Track Glass Standards, SRM numbers 962a and 963a are available at two different uranium concentration

levels, 37.38 ppm and 0.823 ppm, respectively. These glass wafers, 12 mm in diameter and 2 mm thick, with a nominal base composition of 72% Si0

2

, 12% CaO, 14% Na

2Q, and 2% AlpO,. came from the same lot of material as the Trace Element

in Glass SRM's 612 and 614 (5,6,7). This serfes of SRM's nas been analyzed for homogeneity and was certified for approximately half of the more than 60 trace elements present at the four concentration levels, including uranium.

However, in the preparation of these glasses, the uranium used for the dopant was depleted uranium, and each concentration has a different uranium-235 isotopic abundance (as seen in Table I). In determining uranium by the fission track technique, thorium and boron are two major elements that could cause possible interference since they emit charged

particles that may be recorded in many external detectors. The concentrations of these two elements are given in Table

II. In the certification of these glasses, the analytical competences employed by the Center for Analytical Chemistry

were isotope dilution mass spectrometry, polarography , flame emission and atomic absorption spectrometry, spectrophotometry, and nuclear methods of analysis, which included both neutron activation analysis and nuclear track

technique.

To further characterize these standards, the thermal stability of fission tracks in the glasses was also studied to determine the fading rate of the tracks when subjected to heat. This thermal stability was determined by the activation energy which is the amount of energy needed for track annealing. Reimer et al (8) found that the glasses had relatively low thermal stability. Extrapolation of track fading data indicates that tracks could begin to decrease at

50 °C after a time of only several months, Figure I illustrates this extrapolation for SRM 962. Table III lists the activation energies calculated from the track fading experiments that would produce a specific degree of track reduction. It is recommended that these glasses be stored below 20 °C when not being used.

III. CERTIFICATION AND PACKAGE DESCRIPTION

The glasses are certified for the total neutron fluence (n.cm ), in which they were irradiated. Copper and gold foils,

as well as an iron-cobalt foil, were chosen to monitor the neutron fluence since many laboratories routinely use these

foils. The SRM package contains four unirradiated glass wafers and two separately irradiated wafers. The irradiations were

performed in either of two positions of the NBS Research Reactor, each position providing different neutron energy

spectra (9,10). Each package has two numbers designating the specific irradiated glasses enclosed. Figure II illustrates the configuration of the SRM package.

t Available from Office of Standard Reference Materials, National Bureau of Standards, Gaithersburg, MD 20899.

1
IV PREPARATION AND IRRADIATION PROCEDURES

All of the glasses were ground flat and polished on both sid^s, cleaned in dilute nitric acid solution (1 part HNO3:

10 parts H2O) for 2 minutes, rinsed in distilled water and in ethanol , and air dried. Each cleaned wafer was then sandwiched between two pre-cleaned numbered detectors, Lexan* polycarbonate and muscovite mica. The combination was placed in a polyethylene bag which was hermetically vacuum sealed to ensure intimate contact between detectors and wafers. Each nackage was then placed in individual irradiation rabbits. Pre-weighed foil flux monitors of copper, 0.1270-mm thick with average weight 0.021 g; gold, 0.0254-mm thick with average weight 0.031 q; iron-cobalt, 0.0254-mm thick with average weight 0.0037 g, were placed in every tenth rabbit

starting with the first rabbit. (See Fiqure III for sample configuration during irradition.) Each glass concentration level was divided into two groups of 128 samples, and each sample was irradiated individually in one of two different pneumatic tubes of the NBS Reactor (NBSR). In the irradiation positions used for this work, RT-3 has a cadmium ratio of 10.2 for gold foils and 65 for copper foils, while RT-4 has a cadmium ratio of 87 for gold and 536 for copper foils (10). The irradiation time used depended on the uranium concentration and uranium-235 isotopic abundance

(see Table II). Due to the NBSR operating schedule the 962a series of glasses were not irradiated at the usual 10 MW Reactor power but at a reduced power or 8.5 MW.

V. FLUENCE DETERMINATION

After irradiation, the gross radioactivity was allowed to decay and the foil flux monitors were removed from the irra- diation containers while external detectors and glasses were separated. The activity of the 0.511 MeV, ^Cu positron

and its 1.345 MeV gamma-ray was counted with a lithium drifted germanium detector; the same procedure was followed for counting the activity of the 0.412 MeV gamma-ray of 198Au, the 1.099 and 1.292 MeV gamma-rays of Fe and the 1.173 and

1.332 MeV gamma-rays of 60Co. Each foil was counted at various distances from the detector. The detectors had been previously calibrated with NBS SRM's chosen from the NBS radioactivity series; therefore, absolute peak efficiencies

were determined for the various y-ray energies of copper, gold, iron and cobalt. The copper foils were placed between aluminum discs 0.32-mm thick in order to ensure annihilation of all 64C.u , 0.511-MeV positrons close to the foil. After

counting all the foils that had been irradiated in the two reactor positions, the neutron flux for each foil was deter- mined using nuclear and physical constants. The following equations were used to calculate the thermal neutron flux: Activity A =„ -a "

3 (1) A= Activity in nuclear transformations per second at T

Q (Time of zero decay, i.e., and of irradiation)

C= Counts per second at T

q E= Absolute counter efficiency for the appropriate energy gamma-ray

a= Gamma ray intensity; 64 Cu(0.511 MeV) = 0.382 and (1.345 MeV)= 0.0062;

198Au(0.412 MeV) = 0.955 59 Fe(l .099 MeV)= 0.565 and (1.292 MeV)

= 0.435; and

6 °Co(1.173 MeV)= 0.999 and (1.332 MeV)= 0.998 (11)

(2)

-2 -1

<j> = Thermal neutron flux (n.cm .sec ath = Thermal neutron cross section

197 Au=9.8.8xl0- 24 cm2

, 58

Fe=l

N = Total number of target nuclei

58 Fe=1.14xl0" 24cm

2 and 59Co=18. 2xl0~ 24cm2 (Figure IV)

t = Time duration of exposure to neutron field

then the neutron fluence is * = 4»t (3) The external detectors, previously separated from the glass wafers, were chemically etched to optically reveal the fission tracks. The polycarbonate detectors were etched in a 6.5N NaOH solution for 45 minutes at a constant temper- ature of 50 °C, then rinsed in distilled water and air dried. The mica detectors were etched in 48% HF for 45 minutes at 25 °C, rinsed in water, and heated to dry and to volatilize

any remaining HF. The irradiated glass wafers were etched in 24% HF for 20 seconds at 25 °C, rinsed with water for 15 minutes and allowed to air dry.

2
After etching, both of the external detectors were counted with the aid of an image analyzing microscope under the pre- established conditions of either^a minimum of at least 1,000 tracks or 50 random fields of view. The random fields of view were of an area of 1.74x10" cm at a magnification of 50X. An example of the tracks densities obtained from the counting of the external detectors and glass wafers are given in Table IV. The same counting criteria were employed

for the glasses. Counting data was also collected for each series of metal foils, the two external detectors and both sides of the glasses, and a statistical evaluation was performed for trends or variations in the neutron flux. The fluence determinations for glasses SRM 962a and 963a are reported in Tables V and VI, respectively. The neutron

fluence was determined by multiplying the flux by the irradiation time. There were no obvious trends or variations

outside of those imposed by irradiated material.

VI. RECOMMENDED USE OF STANDARD REFERENCE MATERIALS

The SRM's were prepared and certified in a manner to minimize restriction of their specific use. The selection of a reactor facility, the etching conditions, and the counting criteria are all the choice of the individual laboratory.

In order to determine an unknown neutron fluence with this set of glasses, the following procedures are suggested.

1. Determine whether the laboratory will be using glass, mica, or polycarbonate as its primary counting detector

medium.

2. Place a piece, or pieces, of unirradiated SRM 962a or SRM 963a with, or without, an external detector (mica or poly- carbonate) in the irradiation container with samples,

3. After irradiation, polish all pieces of glass, including RT-3 and RT-4 glasses (SRM 962a or SRM 963a irradiated

glasses) to reveal an internal surface. At least 30 pm should be removed. Simultaneously etch all pieces of glass, rinse well, and count. The unknown neutron fluence can then be calculated from the resulting track densities. Repeat

the polishing and etching of RT-3 and RT-4 glasses each time a set of samples are irradiated and counted.

4. Etch the external detectors which were over the RT-3 and RT-4 SRM glasses during irradiation. (Note these detectors can only be etched once). At the same time, etch the external detector used in step 2 when unirradiated pieces of

SRM 962a or SRM 963a were prepared for irradiation. Then count both sets of detectors and determine the neutron

fluence from the track densities.

The users of this material are cautioned that the track densities shown in Table IV are approximate. This is because

the observed track density, particularly in glass, is dependent upon etching conditions, magnification, and microscope

illumination. It is also suggested that all of the irradiated SRM 962a and SRM 963a glasses be stored below 20 °C to reduce the chance of track annealing.

The two SRM irradiated glasses allow an additional option. There was a difference in the thermal to fast neutron ratio

for the irradiation of these wafers, as indicated by the cadmium ratios for gold and copper foil. The wafer selected

for the counting comparisons should most closely approximate the neutron energy conditions of the reactor used. The specific glass used as a standard should always be mentioned by its NBS-SRM number in publication.

ACKNOWLEDGEMENT

The author would like to thank the members of the Reactor Operation Section and T. Mitlehner for their help in the irradiation of the glass wafers, and also to T. Mitlehner for her help in packaging and preparation of these SRMs. Both appreciation and thanks are extended to C. W. Naeser, N. Naeser, M. Miyachi, R. Zimmermann and K. Crowley all of

the U.S. Geological Survey, Denver, Colo., for their assistance in counting the two external detectors as well as the irradiated glasses. Appreciation is also extended to R. Paule, Statistical Consultant for the National Measurement

Laboratory, for his statistical evaluation. A special note of thanks is extended to T. E. Gills of the Office of

Standard Reference Materials

Disclaimer

Certain commercial equipment, instruments, or materials are identified in this paper in order to adequately specify the experimental procedure. In no case does such identification imply recommendation or endorsement by the National Bureau

of Standards, nor does it imply that the material or equipment identified is necessarily the best available for the purpose.

3
REFERENCES

1. National Bureau of Standards Certificates of Analysis for SRM's 961 through 964.

2. NBS Special Publication 260-49 Standard Reference Materials: Calibrated Glass Standards for Fission Track Use, SRM 961, SRM 962, SRM 963 and SRM 964, November 1974.

3. Schreurs, J. W., Friedman, A. M. , Rokop, D. J., Hair, M. W., and Walker, R. M . , Radiation Effects, 7. 231 (1971).

4. Fleischer, R. L., Price, P. B., and Walker, R. M. , Nuclear Science and Engineering, 22, 153 (1965).

5. National Bureau of Standards Certificates of Analysis for SRM's 610 through 616.

6. Carpenter, B. S., Anal. Chem. 44, 600 (1972).

7. Barnes, I. L., Garner, E. L . , Gramlich, J. W. , Moore, L. J. Murphy, T. J., Machlan, L. A., and Shields, W. R .

Anal. Chem., 45, 880 (1973).

8. Reimer, G. M. , Wagner, G. A., and Carpenter, B. S., Radiation Effects, 1J5, 273 (1972).

9. LaFleur, P. D. and Becker, D. A., editors, National Bureau of Standards (U. S.), Technical Note 548, Washington,

D.C. (1970).

10. Becker, D. A. and LaFleur, P. D. , Journal of Radioanalytical Chemistry, 19, 149 (1974).

11. Lederer, C. M., Hollander, J. M. , and Perlman, I., Table of Isotopes , Seventh edition, John Wiley and Sons, Inc. (1978).

4
Table I The Uranium Concentration 235 U

Isotopic Abundance

Total U Concentration 235U Atom Reactor Location and ppm (by weight) Percent Irradiation Time (s) SRM 962a 37.38 ± 0.08 0.2392 RT-3 9.2 RT-4 34.5 SRM 963a 0.823 ± 0.002 0.2792 RT-3 80

RT-4 300

Table II Concentration of Elements

That May Cause Track Interferences

Boron Thorium (ppm by weight) (ppm by weight)

SRM 962a 32 37.79 ± 0.08 SRM 963a 1.3 0.748 ± 0.006

5
Table III Activation Energies for Track Fading

in the NBS Standard Glasses (8)

Density Reduction

QlQo SRM 964 SRM 963 SRM 962 SRM 961

0.95 0.8 eV 0.7 eV 1.2 eV 0.8 eV

0.90 1.0 0.8 1.3 1.0 0.80 1.3 0.9 1.5 1.2 0.70 1.5 1.1 1.7 1.4 0.60 1.7 1.2 1.8 1.6 0.50 1.8 1.5 2.0 1.7

Table IV Approximate Track Densities

SRM 962a

RT-3 RT-4 SRM 963a

RT-3

RT-4

Glass1 10 x104 tcm*2 9 x104 tcm'2

Glass1 2.5 x 104 t cnv2 2.4 x 104 t cm"2

Mica2 9 x104 tcnr2 8 x104 tcnv2

Mica2 2.2 x 104 t cm'2 2.2 x 104

t cm"2

Polycarbonate3 9 x104 tcm"2 8 x104 tcnv2

Polycarbonate3 2.2 x 104 t cm"2

2.1 x 104 t cm" 2

1) Polished internal surface etched for 20 seconds in 24% HF at 25° C, counted

at 500X.

2) External (2n) surface etched for 45 minutes in 48% HF at 25° C, counted

at 500X.

3) External (2n) surface etched for 45 minutes in 6.5 N NaOH at 50° C, counted

at 500X.

6
Table V

SRM 962a Fission Track Glass Standard

Certified Values

NBS Reactor Neutron Fluence Mean Value

Tolerance

Position and S^

n

4dard De

2TM*on

Intervale

(x 1014 n cm z

) a> D Cu Foil RT-4 3.87 ± 0.07 ± 0.29 RT-3 4.37 ± 0.09 ± 0.35 Au Foil RT-4 4.17 ± 0.08 ± 0.33 RT-3 4.75 ± 0.05 ± 0.19 "For Information Purposes Only" d Fe Foil RT-4 3.89 ± 0.08 ± 0.31 RT-3 4.25 ±0.16 ± 0.64 Co Foil RT-4 3.79 ±0.12 ± 0.48 RT-3 4.49 ±0.19 ± 0.75

"Standard Deviations refer to individual metal foils. irradiations were performed at a power of 8.5 megawatts; 9.2 seconds in RT-3,

or 34.5 seconds in RT-4.

cTolerance intervals for 95% of the SRM population at the 95% confidence level. dThese results show greater imprecision.

7
Table VI SRM 963a Fission Track Glass Standard

Certified Values

_ . Neutron Fluence Mean Values _ . p«cm«„ and Standard Deviation Totainy

Position (x1Ql4n cm

.2)a, b Interval Cu Foil RT-4 39.5 ± 0.1 ± 0.5 RT-3 41.2 ± 0.7 ± 2.6 Au Foil RT-4 43.0 ± 0.7 ± 2.9 RT-3 45.8 ± 0.4 ± 1.5 "For Information Purposes Only" d Fe Foil RT-4 40.2 ±1.3 ± 5.3 RT-3 40.7 ±1.1 ± 4.5 Co Foil RT-4 41.2 ± 1.7 ± 6.7 RT-3 45.7 ± 2.2 ± 8.7

aStandard Deviations refer to individual metal foils. irradiations were performed at a power of 10.0 megawatts; 80 seconds in RT-3,

or 300 seconds in RT-4.

cTolerance intervals for 95% of the SRM population at the 95% confidence level. dThese results show greater imprecision.

8
Figure I. Annealing Studies Indicating the Fraction of Uranium Fission Tracks Reduced as a Function of Time and Temperature in the 50 ppm SRM 962
Figure II. Position of RT-3 and RT-4

Irradiated Glasses

STANDARD REFERENCE MATERIALS 962a

FISSION TRACK GLASS

STANDARDS

URANIUM

~50 ppm

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

GAITHERSBURG, MD 20899

10
Figure III. Arrangement of the Glass, Metal Foils

and Detectors During Neutron Irradiations

n
Figure IV. Neutron Cross Sections of Copper, Gold

and Cobalt as a Function of Neutron Energy

t(B)

x 103 Neutron Energy (eV)

ftU.S. GOVERNMENT PRINTING OFFICE: 198'' •» 2 » 997 lOO^

12
U.S. DEPT. OF COMM. BIBLIOGRAPHIC DATA

SHEET (See instructions)

1. PUBLICATION OR REPORT NO. NBS/SP-260/92

2. Performing Organ. Report No. 3. Publication Date Sept. 1984

4. TITLE AND SUBTITLE Standard Reference Materials: Calibrated Glass Standards for Fission Track Use (Supplement to NBS Spec. Pub! . 260-49)

5. AUTHOR(S)

B. S. Carpenter

6. PERFORMING ORGANIZATION (If joint or other than NBS. see instructions) NATIONAL BUREAU OF STANDARDS DEPARTMENT OF COMMERCE

WASHINGTON, D.C 20234

7. Contract/Grant No.

8. Type of Report & Period Covered Final

9. SPONSORING ORGANIZATION NAME AND COMPLETE ADDRESS (Street. City. State, ZIP) Same as No. 6

10. SUPPLEMENTARY NOTES Library of Congress Catalog Card Number: 84-601112

Document describes a computer program; SF-185, FlPS Software Summary, is attached.

11. ABSTRACT (A 200~word or less factual summary of most si gnificant information. If document includes a significant bibliography or literature survey, mention it here) Two glasses of different uranium concentrations were prepared and reissued for certification by the National Bureau of Standards as standards

for use as neutron monitors to aid fission track studies. These Standard

Reference Materials (SRM's) and their uranium concentrations are: SRM 962a

(37.4 ppm) and SRM 963a (0.823 ppm) . These glass wafers were irradiated in the National Bureau of Standards Research Reactor and the neutron fluence

was monitored using copper and gold foils, as well as an iron-cobalt foil.

12. KEY WORDS (Six to twelve entries; alphabetical order; capitalize only proper names; and separate key words by semicolons) fission tracks; flux monitors; glass standards; Standard Reference Material;

thermal neutron irradiation; uranium.

13. AVAILABILITY

£yl Unlimited

I

| For Official Distribution. Do Not Release to NTIS

£y| Order From Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402. Order From National Technical Information Service (NTIS), Springfield, VA. 22161

14. NO. OF

PRINTED PAGES 21

ISCOMM-DC 6043-P30



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