Dosimetry considerations in the irradiation of biological populations Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/zw12z821c

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • The effects of changes in dosimetry conditions on the radiation sensitivity of a constant biological population were determined. The organism used for this study was the strain B of Escherichia coli. The percentage survivals of these cells in an aqueous solution were determined at the same total exposure with different quality x-rays. The total absorbed dose was measured as a function of x-ray quality. During all irradiations the focal-target distance, tube current, field size, and biological population were held constant. The distribution of radiation to which the organisms were exposed was kept constant by the use of a rotating exposure platform. This platform was constructed of materials such that the contributions from backscatter would be minimized. The results indicated that the test organism was more sensitive to low energy x-rays than to high energy x-rays in the range from 15 keV to 145 keV effective energy. However, at low effective x-ray energies the absorbed dose was found to be lower than at higher effective energies. This was explained by differences in the specific ionization of different energy x-rays in aqueous solutions. It was concluded that dosimetry conditions are a significant factor in the determination of the radiation sensitivity of E. coli B. The results indicate the necessity of reporting accurate exposure conditions when studying the radiation response of biological populations.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 5.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Submitted by Alex McFerrin (amscannerosu@gmail.com) on 2014-04-09T17:06:40Z No. of bitstreams: 1 DenovanJamesT1968_Redacted.pdf: 2041963 bytes, checksum: ccfa8dc0a188014f605d73092c442d03 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2014-04-08T14:50:28Z (GMT) No. of bitstreams: 1 DenovanJamesT1968_Redacted.pdf: 1701908 bytes, checksum: bd98b324304c5d785723d9c753aa62c1 (MD5)
  • description.provenance : Submitted by Alex McFerrin (amscannerosu@gmail.com) on 2014-04-03T23:48:19Z No. of bitstreams: 1 DenovanJamesT1968_Redacted.pdf: 1701908 bytes, checksum: bd98b324304c5d785723d9c753aa62c1 (MD5)
  • description.provenance : Approved for entry into archive by Katy Davis(kdscannerosu@gmail.com) on 2014-04-09T23:34:23Z (GMT) No. of bitstreams: 1 DenovanJamesT1968_Redacted.pdf: 2041963 bytes, checksum: ccfa8dc0a188014f605d73092c442d03 (MD5)
  • description.provenance : Made available in DSpace on 2014-04-09T23:34:23Z (GMT). No. of bitstreams: 1 DenovanJamesT1968_Redacted.pdf: 2041963 bytes, checksum: ccfa8dc0a188014f605d73092c442d03 (MD5) Previous issue date: 1967-07-14
  • description.provenance : Rejected by Katy Davis(kdscannerosu@gmail.com), reason: Replace on 2014-04-09T16:39:07Z (GMT)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2014-04-09T17:11:25Z (GMT) No. of bitstreams: 1 DenovanJamesT1968_Redacted.pdf: 2041963 bytes, checksum: ccfa8dc0a188014f605d73092c442d03 (MD5)

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items