Ask the Scholar
Page 1 of 3
I can add historical knowledge about this page.
Page image
OCR
Report of Tests Made on Samples Submitted by
Dr. Flinn, July 20, 1925.
Preliminary examination of the specimens infiented that the
samples marked 1, 2, 3, and B, all in brown bottles, were suffic-
iently radio active for gamma ray measurements. Samples were
therefore hennetically sealed in a standard type of tube and
allowed to tand for about five weeks, afetr which a series of
readings were ande
Bample 1, brown bottle, contains the equivalent of approximately
1.55 micro grams of radium element per
Sample 2, brown bottle, con ains the equivalent of approxiuately
1.75 micro grans of redium element per
Sample 3, brown bottle, contains the equivalent of approxisately
0.02 micro grams of radium element per gram.
Sample B, brown bottle, contains the equivalent of approxinately
0.23 micro scans of r adium element per gram.
Inasmich as the quantity of radium or nesothorium in the remain-
ins samples, with the exception of the urine sanples, is very
snall it has been somewhat difficult to definitely establish
just what their activity amounter to in terms of radium element.
In some instances the activity is so small that it is quite
possible that the activitating agent was introluced by contam-
ination unless the operator who put the samples up used the
utmost of caution. It would have bean a good idea had a emple
of aome of the organs of an animal not t reated with the zine
sulphide been included, as that would have served as a check
for contamination, or the possibility of a slight ionizing power
that may be characteristio of the material as a result of the
method of treating.
Perhpas it will be advisable to describe in brief the method I
used in testing the following samples together with the data
obtained, 8.8 that may give a more concrete idea of the difficult-
iss involved in ascertaining the quantity of activating agant
contained per sram.
A specially constructed type of alpha ray electroscope was used.
First, the natural drift, that is, the time required for the
quartz fibre in the electroscope to pass over a definite number
of divisions in the eyepiece, was determined withthe physical
conditions in the instrument the same as when the sample was to
be read. The sample was then introduced and the time required
Page data
- Page
- 1
- Source index
- 0
- Type
- photo
- Media ID
- dedf0211f75ffc07
- Size
- unknown
Document data
- ID
- 75720028
- Core
- doc
- Type
- document
DTO data
{
"id": "75720028",
"sourceUrl": "https://catalog.archives.gov/id/75720028",
"contentType": "document",
"title": "Report, July 27, 1925",
"citationUrl": "https://catalog.archives.gov/id/75720028",
"collections": [
"Safety Light Collection",
"Records Related to Radium Dial Painters"
],
"iiifBase": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0000530_Page_1.jpg",
"thumbnailUrl": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0000530_Page_1.jpg",
"largeImageUrl": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0000530_Page_1.jpg",
"imageCount": 3,
"hasImages": true,
"source": "import",
"hasTranscription": false
}
Context sent to Scholar
Document identity
{
"localId": "75720028",
"label": "Report, July 27, 1925",
"core": "doc",
"dtoType": "document",
"citationUrl": "https://catalog.archives.gov/id/75720028"
}
Document source metadata
{
"id": "75720028",
"sourceUrl": "https://catalog.archives.gov/id/75720028",
"contentType": "document",
"title": "Report, July 27, 1925",
"citationUrl": "https://catalog.archives.gov/id/75720028",
"collections": [
"Safety Light Collection",
"Records Related to Radium Dial Painters"
],
"iiifBase": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0000530_Page_1.jpg",
"thumbnailUrl": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0000530_Page_1.jpg",
"largeImageUrl": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0000530_Page_1.jpg",
"imageCount": 3,
"hasImages": true,
"source": "import",
"hasTranscription": false
}
Document source extras
{
"url": "https://catalog.archives.gov/id/75720028",
"naId": 75720028,
"levelOfDescription": "fileUnit",
"recordType": "description",
"ocrSource": "nara-archive"
}
Page context
{
"seq": 1,
"pageIndex": 0,
"type": "photo",
"url": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0000530_Page_1.jpg",
"mediaId": "dedf0211f75ffc07",
"ocrText": "Report of Tests Made on Samples Submitted by\nDr. Flinn, July 20, 1925.\nPreliminary examination of the specimens infiented that the\nsamples marked 1, 2, 3, and B, all in brown bottles, were suffic-\niently radio active for gamma ray measurements. Samples were\ntherefore hennetically sealed in a standard type of tube and\nallowed to tand for about five weeks, afetr which a series of\nreadings were ande\nBample 1, brown bottle, contains the equivalent of approximately\n1.55 micro grams of radium element per\nSample 2, brown bottle, con ains the equivalent of approxiuately\n1.75 micro grans of redium element per\nSample 3, brown bottle, contains the equivalent of approxisately\n0.02 micro grams of radium element per gram.\nSample B, brown bottle, contains the equivalent of approxinately\n0.23 micro scans of r adium element per gram.\nInasmich as the quantity of radium or nesothorium in the remain-\nins samples, with the exception of the urine sanples, is very\nsnall it has been somewhat difficult to definitely establish\njust what their activity amounter to in terms of radium element.\nIn some instances the activity is so small that it is quite\npossible that the activitating agent was introluced by contam-\nination unless the operator who put the samples up used the\nutmost of caution. It would have bean a good idea had a emple\nof aome of the organs of an animal not t reated with the zine\nsulphide been included, as that would have served as a check\nfor contamination, or the possibility of a slight ionizing power\nthat may be characteristio of the material as a result of the\nmethod of treating.\nPerhpas it will be advisable to describe in brief the method I\nused in testing the following samples together with the data\nobtained, 8.8 that may give a more concrete idea of the difficult-\niss involved in ascertaining the quantity of activating agant\ncontained per sram.\nA specially constructed type of alpha ray electroscope was used.\nFirst, the natural drift, that is, the time required for the\nquartz fibre in the electroscope to pass over a definite number\nof divisions in the eyepiece, was determined withthe physical\nconditions in the instrument the same as when the sample was to\nbe read. The sample was then introduced and the time required"
}