TABLE 1: Alpha Particle Solution Standards


Radionuclide SRM Approx. Reference Expanded Solution Chemical Solution Notes Number Bq·g-1


Time Uncertainty Mass Form Composition (%)


(g)


Americium-241* 4322C Americium-243* 4332E Curium-243* Curium-244*


4329 4320A


Neptunium-237* 4341 Plutonium-238* 4323B Plutonium-239* 4330C Plutonium-240* 4338A Plutonium-242* 4334H Polonium-209** 4326 Radium-226 Radium-226


4969 4965


Radium-226** 4966A Radium-226** 4967A Radon-222 Radon-222 Radon-222 Radon-222 Thorium-229 Thorium-230 Uranium-232


4971 4972


100 May 2007 0.3


40 ## 70 Jun 1984


35 ## 100 Mar 1992 30 Feb 1994 40 Dec 1995 40 May 1996 25 Jun 1994


1.4


1.3 0.7 0.7 0.8 0.8


1.8 1.2 1.3 0.9


5 5


5 5 5 5 5 5


85 ## 5 3 Sep 1998 30 Sep 1991 280 Jan 2007 2,500 Sep 2003


5 5 5 5


Am(NO3 Am(NO3


4 Total ## 0.2 40 Total ## 0.2


4973 400 Total ## 0.2 4974 5000 Total May 2005 4328C 4342A 4324B


Uranium-238 (Natural) 4321C Uranium-238 Uranium-235 Uranium-234


35 Dec 2007 40 April 2007 30 Jul 2002 Jan 1992


250 11


240 * License Certification is required by NIST for this material.


** License Certification is not required by NIST for this material but a state-issued license may be required for possession. Contact your state Office of Radiation Safety for further information.


# Material in preparation.


a) SRMs 4971, 4972, and 4973 are intended for the calibration of radon-222 measuring instruments. They consist of small heat-sealed polyethylene cylinders containing approximately 0.2 g of radium-226 solution. These SRMs are calibrated in terms of radium-226 activity and in terms of the emanation fraction of the radon-222 under specified conditions.


1.3 0.6 0.4 0.8


0.9 1.0 1.9


0.2 5 5 5


5 Cm(NO3 Cm(NO3 Np(NO3 Pu(NO3 Pu(NO3 Pu(NO3 Pu(NO3 PoCl4 RaCl2 RaCl2 RaCl2 RaCl2 RaCl2 RaCl2 RaCl2 RaCl2


Th(NO3 Th(NO3 UO2


5 UO2


)3 )3 )3 )3


)3


)6 )6


)6 )6


1 M HNO3 1 M HNO3 1 M HNO3 1 M HNO3 2 M HNO3 3 M HNO3 3 M HNO3 3 M HNO3 3 M HNO3 2 M HC1


1.5 M HC1 1.4 M HC1 1.0 M HC1 1 M HC1


)4 )4


(NO3 (NO3 )2 )2


1 M HC1 a 1 M HC1 a 1 M HC1 a 1 M HC1 1 M HNO3 1 M HNO3 2 M HNO3 1 M HNO3


WWW.NIST.GOV/SRM  PHONE: (301) 975-2200  FAX: (301) 948-3730  EMAIL: SRMINFO@NIST.GOV


95


RADIOACTIVITY


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