Radium secondary gamma-ray standard, 0.100x10E-6 gm
date: label: date made
content: 1947
name: label: maker
content: National Bureau of Standards
notes: label: Description
content: Background on secondary gamma-ray standards, Object IDs 1994.0125.55, .56, .57, & .58
label: Description
content: Instruments used for radiation detection, measurements, or surveys need to be calibrated periodically. A radioactive source (not necessarily calibrated) is used to confirm the satisfactory operation of an instrument. A standard source is a radiation source exhibiting a disintegration (e.g., disintegrations per second or dps), emission or exposure rate certified by or traceable to the U.S. National Institute of Standards and Technology (NIST), formerly the National Bureau of Standards (NBS). NIST maintains the primary radiation sources, and makes available and/or certifies secondary sources for instrument calibration. For details on survey instrument calibration, see:
label: Description
content: http://www.rso.utah.edu/policies/rpr/52instrucare/52instrucare.pdf
label: Description
content: Detailed description of Radium secondary gamma-ray standard, 0.100x10E-6 gm, Object 1994.0125.58
label: Description
content: (One of the accompanying] photographs provided by donor, Prof. Herbert Clark, Rensselaer Polytechnic Institute.)
label: Description
content: Flat-bottomed glass ampoule, approximately 3 1/8” long, 5/8” diam., held by cotton wool in a test-tube shaped container capped by a shiny steel screw-cap, 5 ¾” long, 7/8” diam. The ampoule is more than two-thirds full of colorless liquid. The ampoule bears a legend printed on the glass: “0.1 Micro gms. / Radium”. The top of the containing tube bears an adhesive label with the following words printed: “CAUTION / [symbol] / RADIOACTIVE / MATERIAL”
label: Location
content: Currently not on view
topic: label: Subject
content: Science & Scientific Instruments
setName: label: See more items in
content: Medicine and Science: Modern Physics
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content: Science & Mathematics
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content: Modern Physics
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content: Measuring & Mapping
creditLine: label: Credit Line
content: Rensselaer Polytechnic Institute. Department of Chemistry
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1994.0125.58
label: accession number
content: 1994.0125
label: catalog number
content: 1994.0125.58
objectType: label: Object Name
content: gamma-ray standard, secondary, Ra
physicalDescription: label: Physical Description
content: plastic (overall material)
label: Physical Description
content: cotton (overall material)
label: Physical Description
content: steel (overall material)
label: Physical Description
content: paper (overall material)
label: Physical Description
content: liquid with radium (overall material)
label: Physical Description
content: glass (overall material)
label: Measurements
content: overall (transparent, capped plastic container): 5 3/4 in x 7/8 in; 14.605 cm x 2.2225 cm
label: Measurements
content: glass ampoule: 3 1/8 in x 5/8 in; 7.9375 cm x 1.5875 cm