Ask the Scholar
Page 6 of 20
I can add historical knowledge about this page.
Page image
OCR
et
in the ore, assuning the ore is at radioactive equilibrium.
Radioactive equilibrium exists when all of the radioactive
elements in the disintegration series are breaking down as
rapidly as they are being formed. Thus, ore containing one
gram of radium would contain 3,000 kilograms of uranium I
(urenium 238), .04 milligrans of uranium X1 (thorium 234),ete
The minerals containing uranium, and, therefore,
radium, are pitchblende (originally discovered in Czechoslo-
vakia) and carnotite (in the vestern United States). In
1920, a rich grade of pitchblende vas found in the Belgian
Congo, and, in the early 1930's, another was discovered
in the Great Bear Gake region of Northvestern Canada.
Since the early 1940's, virtually the entire vorld's supply
of radium has cone from uranium ores mined in Canada and
the Belgian Congo.
The actual weight of radium present in the ore
is exceedingly small. There is only one part radium to
each 3,000,000 parts of uranium I (uraniura 238). The method
of extracting the radium consists of four major steps origi-
nally worked out by Madame Curie. AS the process exists today,
the chemical trestments involved are directed toward the ex-
traction of the alement barium, since bariun appears in work-
able quantities, has chemical properties alnost identionl to
radium, and carries the radium with it throughout the initial
processing. First, the uranium are is treated with sulphuric
acid which dissolves the uranium, and the radium and bariwn
-6-
Page data
- Page
- 6
- Source index
- 0
- Type
- photo
- Media ID
- d76d8ad01291734b
- Size
- unknown
Document data
- ID
- 75730541
- Core
- doc
- Type
- document
DTO data
{
"id": "75730541",
"sourceUrl": "https://catalog.archives.gov/id/75730541",
"contentType": "document",
"title": "Report, October , 1949",
"citationUrl": "https://catalog.archives.gov/id/75730541",
"collections": [
"Safety Light Collection",
"Records Related to Radium Dial Painters"
],
"iiifBase": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0003651_Page_01.jpg",
"thumbnailUrl": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0003651_Page_01.jpg",
"largeImageUrl": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0003651_Page_01.jpg",
"imageCount": 20,
"hasImages": true,
"source": "import",
"hasTranscription": false
}
Context sent to Scholar
Document identity
{
"localId": "75730541",
"label": "Report, October , 1949",
"core": "doc",
"dtoType": "document",
"citationUrl": "https://catalog.archives.gov/id/75730541"
}
Document source metadata
{
"id": "75730541",
"sourceUrl": "https://catalog.archives.gov/id/75730541",
"contentType": "document",
"title": "Report, October , 1949",
"citationUrl": "https://catalog.archives.gov/id/75730541",
"collections": [
"Safety Light Collection",
"Records Related to Radium Dial Painters"
],
"iiifBase": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0003651_Page_01.jpg",
"thumbnailUrl": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0003651_Page_01.jpg",
"largeImageUrl": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0003651_Page_01.jpg",
"imageCount": 20,
"hasImages": true,
"source": "import",
"hasTranscription": false
}
Document source extras
{
"url": "https://catalog.archives.gov/id/75730541",
"naId": 75730541,
"levelOfDescription": "fileUnit",
"recordType": "description",
"ocrSource": "nara-archive"
}
Page context
{
"seq": 6,
"pageIndex": 0,
"type": "photo",
"url": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0003651_Page_06.jpg",
"mediaId": "d76d8ad01291734b",
"ocrText": "et\nin the ore, assuning the ore is at radioactive equilibrium.\nRadioactive equilibrium exists when all of the radioactive\nelements in the disintegration series are breaking down as\nrapidly as they are being formed. Thus, ore containing one\ngram of radium would contain 3,000 kilograms of uranium I\n(urenium 238), .04 milligrans of uranium X1 (thorium 234),ete\nThe minerals containing uranium, and, therefore,\nradium, are pitchblende (originally discovered in Czechoslo-\nvakia) and carnotite (in the vestern United States). In\n1920, a rich grade of pitchblende vas found in the Belgian\nCongo, and, in the early 1930's, another was discovered\nin the Great Bear Gake region of Northvestern Canada.\nSince the early 1940's, virtually the entire vorld's supply\nof radium has cone from uranium ores mined in Canada and\nthe Belgian Congo.\nThe actual weight of radium present in the ore\nis exceedingly small. There is only one part radium to\neach 3,000,000 parts of uranium I (uraniura 238). The method\nof extracting the radium consists of four major steps origi-\nnally worked out by Madame Curie. AS the process exists today,\nthe chemical trestments involved are directed toward the ex-\ntraction of the alement barium, since bariun appears in work-\nable quantities, has chemical properties alnost identionl to\nradium, and carries the radium with it throughout the initial\nprocessing. First, the uranium are is treated with sulphuric\nacid which dissolves the uranium, and the radium and bariwn\n-6-"
}