ABSOLUTE CALIBRATION OF THE NATIONAL BUREAU OF STANDARDS PHOTONEUTRON SOURCE. III. ABSORPTION IN A HEAVY WATER SOLUTION OF MANGANOUS SULPHATE

Journal Article · Sun Sep 01 04:00:00 EDT 1963 · J. Nucl. Energy Pts. A & B

DOI:https://doi.org/10.1016/0368-3230(63)90080-6· OSTI ID:4688210

Noyce, R H; Mosburg, Jr, E R; Garfinkel, S B; Caswell, R S

The neutron emission rate for the National Bureau of Standards radium-- beryllium ( gamma ,n) standard source (NBS-I) was redetermined by a relative comparison to an antimomy-beryllium source, which had been calibrated absolutely in a heavy water manganous sulfate solution through an indirect method involving 4 pi BETA - gamma coincidence counting of the induced Mn/sup 56/ activity. Correction was made for absorption of neutrons by other elements present in the bath. The emission rate of NBS-I was found to be 1.25 x 10/sup 6/ n/sec as of June, 1961 with an uncertainty of 1%. This measurement, when suitably averaged with previous determinations yields the best value 1.25 x 10/sup 6/ n/sec with an uncertainty of 1%. (auth)

• Research Organization: National Bureau of Standards, Washington, D.C.
• NSA Number: NSA-17-041849
• OSTI ID: 4688210
• Journal Information: J. Nucl. Energy Pts. A & B, Journal Name: J. Nucl. Energy Pts. A & B Vol. Vol: 17
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
BERYLLIUM
BETA PARTICLES
COINCIDENCE METHODS
COUNTERS
EFFICIENCY
ELEMENTS
GAMMA RADIATION
HEAVY WATER
MANGANESE 56
MANGANESE SULFATES
MEASURED VALUES
NEUTRON FLUX
NEUTRON SOURCES
PHOTONEUTRONS
PHYSICS
RADIOACTIVITY
RADIUM
SOLUTIONS
STANDARDS