Bibliographic Citation
| Document | This document is available for digitization by request/sponsorship. For copies of Journal Articles, please contact the Publisher or your local public or university library and refer to the information in the Resource Relation field. For copies of other documents, please see the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or Document Availability. |
|---|---|
| Title | MEASUREMENT OF STOPPING POWER OF COPPER BY CALORIMETRIC METHODS (thesis) |
| Creator/Author | Ziemer, P.L. ; Johnson, R.M. ; Birkhoff, R.D. |
| Publication Date | 1960 Jan 01 |
| OSTI Identifier | OSTI ID: 4193596 |
| Report Number(s) | ORNL-2775 |
| DOE Contract Number | W-7405-ENG-26 |
| Resource Type | Technical Report |
| Resource Relation | Other Information: Submitted to Vanderbilt Univ. Orig. Receipt Date: 31-DEC-60 |
| Research Org | Oak Ridge National Lab., Tenn. |
| Subject | PHYSICS; COATING-- COPPER-- ELECTRONS-- ENERGY-- EVAPORATION-- FOILS-- GLASS-- LOSSES-- MEASURED VALUES-- PREPARATION-- SOLUBILITY; CONSTANTAN-- COPPER-- COPPER ALLOYS-- ELECTRONS-- ENERGY-- FOILS-- HEATING-- LOSSES-- MEASURED VALUES-- NICKEL ALLOYS-- THERMOCOUPLES-- THICKNESS; COPPER-- ELECTRON BEAMS-- ELECTRONS-- ENERGY-- ENERGY RANGE-- LINEAR ACCELERATORS-- LOSSES-- MEASURED VALUES; COPPER-- ELECTRONS-- ENERGY-- ERRORS-- LOSSES-- MEASURED VALUES-- SCATTERING |
| Description/Abstract | The electron stopping power of copper was determined by measuring directly the power dissipated as heat in a copper foil by a transmitted beam of monoenergetic electrons. Monoenergetic electrons from an electron gun were accelerated by a linear accelerator and impinged normally on a 191.8 microgram per square centimeter copper foil. The electron beam was varied from 31.56 to 126.56 kev in steps of 10 kev, and the heating effect was determined at each energy. The power dissipated as heat was measured using a set of six copper- constantan thermocouples. The ratio of this power loss to the current of the electron beam passing through the foil gave the average energy loss, DELTA -barE- bar, for each incident energy. The thermocouple system was calibrated by lowering the beam energy below 2.5 kev so that the beam was completely absorbed in the foil. Foils were prepared by vacuum evaporation onto a water soluble coating on a glass slide. Details of technique of evaporation and mounting are given. The path length for the bombarding electrons corresponded to the foil thickness, DELTA -barx-bar, and was determined by weighing a known area (0.987 cm/sup 2/) of foil. Corrections were made for single and multiple scattering effects, and the stopping power was then given by the ratio DELTA -barE-bar/ DELTA -bar. The probable error was calculated and found to be 3.7%. For all energies examined agreement was found with Bethe's expression for electron stopping power. (auth) |
| Country of Publication | United States |
| Language | English |
| Format | Medium: X; Size: Pages: 117 |
| Availability | NTIS |
| System Entry Date | 2008 Feb 05 |
Top | |