Cobalt 60 secondary gamma-ray standard, 0.685x10E5 dps

Object Details

National Bureau of Standards

Description

Background on secondary gamma-ray standards, Object IDs 1994.0125.55, .56, .57, & .58

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:

http://www.rso.utah.edu/policies/rpr/52instrucare/52instrucare.pdf

Detailed description of Cobalt 60 secondary gamma-ray standard, 0.685x10E5 dps, Object 1994.0125.56

Flame sealed glass ampoule, 3” long, 5/8” diam., held by base and tip in a transparent cylindrical plastic container with black-painted aluminum screw cap, 3 ¾” long, 7/8” diam. About two-thirds of the ampoule volume contains a slightly pinkish-tinged liquid. A glued-on paper label, with a red border on 3 sides, handwritten in blue ink reads: “Nat. Bureau of Stds / Co[E]60 Gamma Ray Std / 0.685x10[E]5 dps on / Oct. 1, 1953”

Location

Currently not on view

Credit Line

Rensselaer Polytechnic Institute. Department of Chemistry

1953

ID Number

1994.0125.56

accession number

1994.0125

catalog number

1994.0125.56

Object Name

gamma-ray standard, secondary, Co60

Physical Description

plastic (overall material)

cotton (overall material)

aluminum (overall material)

paper (overall material)

liquid with cobalt 60 (overall material)

glass (overall material)

Measurements

overall (transparent, capped plastic container): 3 3/4 in x 7/8 in; 9.525 cm x 2.2225 cm

glass ampoule: 3 in x 5/8 in; 7.62 cm x 1.5875 cm

See more items in

Medicine and Science: Modern Physics

Science & Mathematics

Modern Physics

Measuring & Mapping

National Museum of American History

Subject

Science & Scientific Instruments

Record ID

nmah_745453

Metadata Usage (text)

CC0

GUID (Link to Original Record)

https://n2t.net/ark:/65665/ng49ca746b2-a74f-704b-e053-15f76fa0b4fa