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The Rosalind Franklin Papers

Title:
Letter from Rosalind Franklin to L. H. Gray pdf (42,657 Bytes) transcript of pdf
Letter from Rosalind Franklin to L. H. Gray
Description:
Louis Harold Gray was a physicist and radiation biologist who specialized in the application of radiation to cancer therapy. Franklin had sought his advice regarding the tendency of viruses to break down during long exposures to x-rays, one of the many challenges in her virus work. In this letter, she accepted his offer to have one of her x-ray exposures analyzed for the exact dose level.
Number of Image Pages:
1 (42,657 Bytes)
Date:
1957-03-25 (March 25, 1957)
Creator:
Franklin, Rosalind
Recipient:
Gray, L. H.
Mount Vernon Hospital
Source:
Original Repository: Churchill Archives Centre. The Papers of Rosalind Franklin
Rights:
Reproduced from the Franklin Collection at the Churchill Archives Centre with the permission of the copyright holder.
Subject:
Medical Subject Headings (MeSH):
Viruses
X-Ray Diffraction
Exhibit Category:
Envisioning Viruses: Birkbeck College, London, 1953-1958
Folder Number:
2/34
Unique Identifier:
KRBBGR
Document Type:
Letters (correspondence)
Language:
English
Format:
application/pdf
image/tif
Series: Work on Tobacco Mosaic Virus (TMV)
Folder: Correspondence and Working Notes, 1953-1959
Transcript:
25th March, 1957
Dear Dr. Gray,
Thank you for your letter of 20th March.
We have exposed one of the pieces is of perspex which you sent me, and I am now returning it to you. The X-ray exposure was overall a length of 15 mm in the centre of the piece, and lasted 20 hours. Because no collimator was used, the intensity would be slightly greater than that which reaches of virus crystal, but the total exposure would be about the same as one of the longest exposures of a crystal. I should be very interested to know what does level this corresponds to. I gather from a recent discussion with Dr. Perutz that 5 times 10 [to the fifth] may be an under-estimate.
Yours sincerely,
Rosalind Franklin
Metadata Last Modified Date:
2008-10-22
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