Ionizing Radiation Measurements Radioactivity Sources Rate our Services Technical Contacts:
Lisa R. Karam
All Services
Tel: 301/975-5561
E-mail: lisa.karam@nist.gov Michael P. Unterweger
43030C, 43040C, 43070S, 43090S
Tel: 301/975-5536
E-mail: michael.unterweger@nist.gov Jeffrey T. Cessna
43010C, 43020C, 43060S, 43070S
Tel: 301/975-5539
E-mail: jeffrey.cessna@nist.gov Lynne King
43030C-43050C, 43090S
Tel: 301/975-5544
E-mail: lynne.king@nist.gov Administrative and Logistics
Tel: 301/975-5539
E-mail: jeffrey.cessna@nist.gov Please contact the technical staff before shipping instruments or standards to the address listed below. Mailing Address:
National Institute of Standards and Technology
100 Bureau Drive, Stop 8462
Gaithersburg, MD 20899-8462
Service ID
Number | Description of Services | Fee ($) | | 43010C | Gamma-Ray-Emitting Radionuclides in Solution (Half Lives Greater than 15 Days) | 2547 | | 43020C | Gamma-Ray-Emitting Radionuclides in Solution (Half Lives Less than 15 Days) | 4237 | | 43030C | Alpha-Particle-Emitting Solid Sources, NIST 2  alpha Proportional Counter | 1857 | | 43040C | Alpha-Particle-Emitting Solid Sources, NIST 0.8 alpha Defined-Solid-Angle Counter | 1825 | | 43050C | Alpha-Particle-Emitting Solid Sources, Using Both Counting Systems | 3488 | | 43060S | Special Tests of Beta-Particle-Emitting Solution Sources, Liquid Scintillation Counting | 5137 | | 43070S | Special Tests of Beta-Particle-Emitting Solution Sources, Other Techniques | At Cost | | 43090S | Special Tests of Alpha-Particle-Emitting Solid Sources | At Cost | Fees are subject to change without notice. back to top of page | back to index of ionizing radiation measurements NIST offers calibration services on the radioactivity of over 50 radionuclides. Calibrations are provided to meet the requirements of industry, research, environmental monitoring, and the life sciences. Radioactivity calibration services are available for alpha-particle solid sources, beta-particle solutions, and gamma-ray solutions. In order to offer such a broad range of services, NIST must place stringent limitations on the physical and chemical form and activity range of sources that can be accepted. To ensure that these specifications are understood, it is essential that there be good communication between the technical user and the technical contact at NIST. When planning to have a source calibrated, the user should discuss the following points with the NIST contact: A. Type of calibration: More than one type of calibration is often available for a given source. A cobalt-60 source, for example, may be calibrated in terms of total activity or gamma-ray-emission rate. (Inquiries regarding the calibration of radioactive sources for exposure rate should be directed to the Dosimetry Group. See Service ID Numbers 47010C to 47040S.) The required uncertainty in the calibration should also be discussed. B. General packaging and shipping requirements: Two general requirements apply to all sources submitted for calibration: (1) all shipments must conform to applicable Nuclear Regulatory Commission (NRC) and Department of Transportation (DOT) packaging and transport; and (2) source descriptions, including approximate activity, must be provided in advance. The NIST Health Physics Group must approve the receipt of radioactive material, and sources may be refused if the necessary information is not available. C. Reports of Calibration: A Report of Calibration is sent upon completion of a radioactivity calibration service. If the user has particular requirements for documentation of the calibration, these should be discussed with the technical contact at NIST before the services are performed. D. Sample Preparation, Packaging, and Shipping: All samples submitted for calibration must be chemically and physically stable. The chemical form of solutions suggested for beta-particle emitters and gamma-ray emitters are described later in this document. A special lot of borosilicate-glass ampoules must be used for gamma-ray emitters. Empty ampoules are provided for this purpose. The volume of material in the ampoule should be (5.0 ± 0.2) mL. Packaging for all sources must be in compliance with DOT and NRC regulations. Copies of regulations may be obtained from Operations Division, Office of Hazardous Materials, Department of Transportation, Washington, DC 20950. Postal regulations prohibit the mailing of radioactive materials that require a caution label under DOT regulations. Alpha-particle solid sources must be sent in special source holders designed so that the active area is not touched by any material. For sources to be measured in the 2  counter (calibration 43030C), the diameter of the source must be less than 10 cm and that of the active surface less than 9 cm. For the 0.8 counter (calibration 43040C), the maximum diameter is 1.6 cm. All sources arriving at NIST are checked by the Health Physics Group for radiation level and source integrity. Sources should be shipped to the attention of the technical contact at NIST. Do not ship sources to the mailing address. Contact the technical staff for the shipping address. back to top of page | back to index of ionizing radiation measurements Tables 1 and 2 list 41 radionuclide solutions that may be calibrated in the NIST "4 "  ionization chamber. The sources must be submitted flame-sealed in special ampoules provided by NIST. The operation of this type of chamber is described in NCRP Report 58, A Handbook of Radioactivity Measurements Procedures, Section 4.4 "Ionization Chambers", and in NBS SP 250-10, Radioactivity Calibrations with the "4 " Gamma Ionization Chamber and other Radioactivity Calibration Capabilities (see references). Table 1. Specifications for Calibration of Solutions of Gamma-Ray Emitting Radionuclides Having Half Lives Greater Than 15 Days
| Suggested Chemical Form (c) | | Radionuclide | Typical
Relative Expanded Uncertainty(a)
(%)
| Activity Range (b)
(Mbq)
| Carrier | Solution | | 22Na | 1.1 | 0.4 to 40 | NaCl | 1 mol/L, HCl | | 46Sc | 0.5 | 0.4 to 40 | ScCl3 | 1 mol/L, HCl | | 51Cr | 0.7 | 2 to 60 | CrCl3 | 0.5 mol/L, HCl | | 54Mn | 0.8 | 2 to 60 | MnCl2 | 1 mol/L, HCl | | 57Co | 0.5 | 2 to 60 | CoCl2 | 1 mol/L, HCl | | 59Fe | 0.9 | 0.4 to 40 | FeCl3 | 1 mol/L, HCl | | 60Co | 0.5 | 0.4 to 40 | CoCl2 | 1 mol/L, HCl | | 75Se | 1.6 | 2 to 60 | H2SeO3 | 1 mol/L, HNO3 | | Sr | 1.3 | 2 to 60 | SrCl2 | 1 mol/L, HCl | | 88Y | 0.5 | 0.4 to 40 | YCl3 | 1 mol/L, HCl | | 109Cd-109mAg* | 1.1 | 2 to 60 | CdCl2 | 1.3 mol/L, HCl | | 110mAg-110Ag | 0.6 | 0.4 to 40 | AgNO3 | 1 mol/L, HNO3 | | 113Sn-113mIn(d) | 2.0 | 2 to 60 | SnCl2 or SnCl4 | 4 mol/L, HC | | 114mIn | 0.7 | 2 to 200 | InCl2 | 3 mol/L, HCl | | 123mTe | 0.7 | 2 to 100 | TeCl | 2 mol/L, HCl | | 133Ba | 1.0 | 2 to 60 | BaCl2 | 1 mol/L, HCl | | 134Cs | 0.7 | 2 to 60 | CsCl | 1 mol/L, HCl | | 137Cs-137mBa | 1.0 | 2 to 60 | CsCl | 1 mol/L, HCl | | 139Ce | 0.7 | 2 to 60 | CeCl3 | 1 mol/L, HCl | | 141Ce | 1.3 | 2 to 60 | CeCl3 | 1 mol/L, HCl | | 144Ce* | 0.9 | 2 to 740 | CeCl3 | 1 mol/L, HCL | | 152Eu | 1.1 | 0.4 to 40 | EuCl3 | 1 mol/L, HCl | | 153Gd* | 1.3 | 2 to 60 | GdCl3 | 1 mol/L, HCl | | 154Eu | 0.5 | 0.4 to 40 | EuCl3 | 4 mol/L, HCl | | 155Eu | 1.0 | 2 to 60 | EuCl3 | 4 mol/L, HCl | | 169Yb* | 1.7 | 2 to 60 | YbCl3 | 0.1 mol/L, HCl | | 195Au* | 1.5 | 2 to 60 | KAu(CN)4 | 10 g/L, KCN
10 g/L, KCl | | 203Hg | 0.9 | 2 to 60 | Hg(NO3)2 | 0.1 mol/L, HNO3 | | (a) The uncertainty will depend upon the activity and the chemical form.
(b) The source activity should be in the indicated range when it arrives at NIST. The calibration scheduling must be coordinated with the NIST technical contact.
(c) This information is based in large part on the NIST Standard Reference Materials for these radionuclides. For those radionuclides marked with an asterisk, the carrier should be discussed with the NIST technical contact.
(d) The calibration of 113Sn-113mIn is in terms of gamma-ray-emission rate rather than activity. | back to top of page | back to index of ionizing radiation measurements Table 2. Specifications for Calibration of Solutions of Gamma-Ray-Emitting Radionuclides Having Half Lives Less Than 15 Days
| Suggested Chemical Form(c) | | Radionuclide | Typical Relative Expanded Uncertainty (a)
(%) | Activity Range (b)
(MBq) | Carrier | Solution | | 24Na | 0.5 | 0.4 to 40 | NaCl | 1 mol/L, HCl | | 67Ga | 0.9 | 0.4 to 40 | GaCl3 | 2 mol/L, HCl | | 99Mo-99mTc | 1.1 | 2 to 60 | Na2MoO4 | 4mol/L, HNO3 | | 99mTc | 1.0 | 2 to 60 | No carrier added/ NaTeO4 | Saline | | 111In | 0.9 | 2 to 60 | InCl2 | 3 mol/L, HCl | | 123I* (c) | 1.0 | 2 to 60 | KI,Na2SO3 | 0.01 mol/L, LiOH | | 131I* (c) | 0.9 | 2 to 60 | KI,Na2SO3 | 0.01 mol/L, LiOH | | 140Ba-140La | 2.3 | 0.4 to 40 | Ba(NO3)2,
La(NO3)3 | 1 mol/L, HCl | | 186Re | 0.6 | 2 to 600 | ReCl3 | Saline | | 197Hg | 1.6 | 2 to 60 | Hg(NO3)2 | 0.1 mol/L, HNO3 | | 198Au | 0.9 | 2 to 60 | KAu(CN)4 | 10 g/L, KCl,
10 g/L, KCN | | 201Tl | 1.3 | 2 to 60 | Tl(NO3)3 | 0.9 mol/L, HNO3 | | 203Pb | 1.1 | 2 to 60 | PbCl2 | 0.5 mol/L, HCl | | (a)The uncertainty depends upon the activity and the chemical form.
(b)The source activity should be in the indicated range when it arrives at NIST. The calibration scheduling must be coordinated with the NIST technical contact.
(c)This information is based in large part on the NIST Standard Reference Materials for these radionuclides. For those radionuclides marked with an asterisk, the carrier should be discussed with the NIST technical contact. | back to top of page | back to index of ionizing radiation measurements Alpha-particle sources may be calibrated using the National Institute of Standards and Technology 2 proportional counter, or the National Institute of Standards and Technology 0.8 defined-solid-angle counter. The former calibration is in terms of alpha-particle-emission rate into 2 steradians, while the latter is in terms of total activity. Sources to be measured by 2 proportional counting should be on an electrically conductive backing. A more detailed comparison of these counting systems is given in NCRP Report 58 (Section 3.7) and in NBS SP 250-5, Alpha-Particle Calibrations. Backscattering corrections for a variety of source-mount materials are discussed in the references given. The source thickness must be such that more than 99.5% of the emitted alpha particles have an energy greater than 400 keV. Further specifications for these calibration services are given in Table 3 Service 43050C includes calibration of the same source using both counting systems. Large area sources of plutonium-238 may also be measured providing the source thickness is as above. The activity range is 102 Bq to 105 Bq utilizing large-area internal and external counters. Table 3. Specifications for Calibrations Using the 2 Proportional Counter and the 0.8 Defined Solid Angle Counter back to top of page | back to index of ionizing radiation measurements Beta-particle-emitting solutions that conform to the physical, chemical, and activity specifications for measurement are assayed by liquid-scintillation counting as shown in Table 4. The suggested radioactivity concentration range is 20 kBq/g to 2000 kBq/g. No examination is made for beta-particle-emitting impurities, except in the case of phosphorus-32 for which a half-life determination is made of 33P. The sources are examined for gamma-ray emitting impurities. Measurement of beta-particle-emitting solutions by techniques other than liquid-scintillation may be made by special arrangement. Table 4. Specifications for Special Tests of Beta-Particle-Emitting Solution Sources
| Suggested Chemical Composition(b) | | Radionuclide | Typical Relative Expanded Uncertainty(a)
(%) | Carrier | Solution | | 3H | 0.7 | H2O | H2O | | 14C | 1.0 | Na2CO3 | 0.001 mol/L, NaOH | | 32P(c) | 0.7 | H3PO4 | 0.0034 mol/L, H3PO4 | | 33P | 0.7 | H3PO4 | 0.0034 mol/L, H3PO4 | | 35S | 0.7 | Li2SO4 | 0.1 mol/L, HCl | | 36Cl | 1.3 | NaCl | H2O | | 89Sr | 0.7 | SrCl2 | 1 mol/L, HCl | | 90Sr-90Y | 0.7 | SrCl2/YCI3 | 1 mol/L, HCl | | 90Y | 0.7 | YCl3 | 1 mol/L, HCl | | 147Pm | 0.7 | PmCl3 | 1 mol/L, HCl | | 204Tl | 1.3 | Tl(NO3)3 | 1 mol/L, HNO3 | | (a) The uncertainty will depend upon the activity level and the chemical form.
(b) The chemical composition is critical for these calibrations and should be discussed before sending the source.
(c) This calibration includes a half-life fit to determine the 33P impurity. | back to top of page | back to index of ionizing radiation measurements Special arrangements may be made for measurements of solid alpha-particle-emitting sources with emission rates exceeding 1.1 x 104 Bq. back to top of page | back to index of ionizing radiation measurements
References-Radioactivity Sources NBS Measurement Services: Radioactivity Calibrations with the "4 " Gamma Ionization Chamber and Other Radioactivity Calibration Capabilities , J. M. Calhoun, Natl. Bur. Stand. (U.S.), Spec. Publ. 250-10 (Oct. 1987). NBS Measurement Services: Alpha-Particle Calibrations (2004) , J. M. R. Hutchinson, Natl. Bur. Stand. (U.S.), Spec. Publ. 250-5a (Jan. 2004). NCRP Report 58, A Handbook of Radioactivity Measurements Procedures, Section 3.7-Alpha-Particle Counting , W. B. Mann, Ed., Natl. Council Rad. Protect. and Meas., Washington, DC (1985). Study of the Scattering Correction for Thick Uranium-Oxide and Other-Particle Sources, I: Theoretical , L. L. Lucas and J. M. R. Hutchinson, Int. J. Appl. Radiat. Isotopes 27, 35 (1976). Study of the Scattering Correction for Thick Uranium-Oxide and Other-Particle Sources, II: Experimental , J. M. R. Hutchinson, L. L. Lucas, and P. A. Mullen, Int. J. Appl. Radiat. Isotopes 27, 43 (1976). Backscattering of Alpha Particles from Thick Metal Backings as a Function of Atomic Weight , J. M. R. Hutchinson, C. R. Naas, D. H. Walker, and W. B. Mann, Int. J. Appl. Radiat. Isotopes 19, 517 (1968). An Experimental Study of the Backscattering of 5.3 MeV-Alpha Particles from Platinum and Monel Metal , D. H. Walker, Int. J. Appl. Radiat. Isotopes 16, 183 (1965). back to top of page | back to index of ionizing radiation measurements Date created: 06/30/1999
Last updated: 01/15/2009 |
