Zobrazeno 1 - 10
of 71
pro vyhledávání: '"F.J. Schima"'
Publikováno v:
Applied Radiation and Isotopes. 49:335-344
Strontium-89 standards have been prepared for use in calibrating instruments in the measurement chain from production in reactors to administration in the clinic or radiopharmacy. Alternate reactor production schemes were evaluated to yield high puri
Publikováno v:
Applied Radiation and Isotopes. 49:317-328
Solutions containing the potential bone pain palliation radionuclide 117mSn, in chloride form and as a diethylenetriaminepentaacetate (DTPA) complex, have been standardized by 4 pi beta liquid scintillation (LS) spectrometry and 4 pi gamma-ray spectr
Autor:
Robert Holloway, D. S. Popplewell, F.J. Schima, P. W. Krey, Zhichao Lin, Barry B. Warren, Trevor H. Bates, Kenneth G. W. Inn, David McCurdy, James Harvey, Peter Young, Walter S. Liggett, M.J. Woods, Chih-An Huh, J. Handl, Andrew Holms, Masayoshi Yamamoto, Kevin J. Odell, Simon Jerome, Melvin S. Feiner, Thomas M. Beasley, I. L. Larsen, P. Germain, Chung-King Liu, Bernard R. Harvey
Publikováno v:
Applied Radiation and Isotopes. 47:967-970
The National Institute of Standards and Technology (NIST), in cooperation with experienced international laboratories, will issue a low-level radioactivity Ocean Sediiment Standard Reference Material (SRM) 4357 in 1996. The Ocean Sediment joins the N
Publikováno v:
Applied Radiation and Isotopes. 45:1165-1175
Asays of 209Po by 4πα liquid scintillation (LS) measurements are confounded by an α-transition to a 2.3 keV ( J π = 1 2 − ) level in 205Pb which was previously unknown to be a delayed isomeric state. The level is believed to be populated by a s
Autor:
D B. Golas, F.J. Schima, J M. Calhoun, Jeffrey T. Cessna, Michael P. Unterweger, Bert M. Coursey
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 339:26-30
Radionuclides are increasingly used in therapeutic nuclear medicine. The CIEMAT/NIST method of standardizing high-energy beta-particle emitters is being applied to a list of candidate radionuclides developed by the US nuclear medicine community. Stan
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 312:349-352
The half-lives of many radionuclides have been measured in the Radioactivity Group of NIST over the last three decades. The results of these measurements for many long-lived radionuclides such as 60Co, 137Cs, 85Kr, 22Na, 133Ba, 207Bi, 152Eu, 1 33Eu,
Autor:
M.T. Martin-Casallo, Eduardo García-Toraño, Jeffrey T. Cessna, Michael P. Unterweger, D B. Golas, J.M. Los Arcos, D.D. Hoppes, A. Grau Malonda, F.J. Schima, D. Gray, Bert M. Coursey
Publikováno v:
International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes. 42:865-869
Rhenium-186 has been standardized for activity by the CIEMAT/NIST method of 4πβ liquid-scintillation efficiency tracing with tritium, with an uncertainty (equivalent to 1 SD) of 1.61%. Half-life measurements with a pressurized ionization chamber gi
Publikováno v:
Physical Review C. 59:528-530
Autor:
F.J. Schima
Publikováno v:
Applied Radiation and Isotopes. 49:1359-1361
Gamma-ray emission rates have been measured for highly pure sources of 89 Sr. These sources were prepared with relative 85 Sr activity ratios that ranged from less than 0.006% to undetectable, and had been previously standardized for radioactive conc
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 312:121-123
A commercial liquid-scintillation system and calibrated germanium gamma-ray spectrometers were used to confirm the use of the 159-keV gamma ray of 123m Te as a primary efficiency calibrant for which the activity measurement is simple. The evaluated g