The special distribution of X-rays scattered within a water phantom
Date
1956-04
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
ORCID
Type
Degree Level
Masters
Abstract
The biological effects produced by an X-ray beam are dependent
on the spectral distribution of the rays. Untortunately a straight-forward
determination of this spectral distribution at a point
within a biological medium is complicated by scattering processes
which significantly alter the spectral distribution at the point
from that of the primary radiation. Prior to the advent of the
sodium iodide scintillation counter, direct measurements of the
spectrum of the radiation inside a scattering medium were impossible
although some information was obtained (1,2) using dual isolation
chambers.
The application of a scintillation spectrometer to the measurement of the spectral distribution of scattered X-rays within a water
phantom has, however, made it possible to obtain more detailed and
more extensive information about the radiation. In particular,
coupled with a prior investigation of the primary spectral distribution
(3) the investigation of the scattered radiation here
reported provides the total spectral distribation of the X-rays at
central axis points within a phantom, the manner in which the
biological effectiveness of the rays as expressed by linear energy transfer changes with depth and field size, and the differetial
absorption of the rays in bone and soft tissue for 400 KVP X-rays,
HVL 3.8 mm of Cu.
Description
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Citation
Degree
Master of Science (M.Sc.)
Department
Physics
Program
Physics