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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Gamma rays from sodium due to proton bombardment

Burling, Richard Lancaster, January 1941 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1941. / Typescript. Includes abstract and vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 12).

Gamma-rays from beryllium due to proton bombardment

Hushley, Walter John, January 1943 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1943. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves [34-35]).

Spectrum and yield of neutrons from 31.5-Mev proton bombardment of selected isotopes of cobalt and nickel

Bostick, Hoyt A. January 1958 (has links)
Thesis--University of California, Berkeley, 1958. / "Physics and Mathematics" -t.p. Includes bibliographical references (p. 101-102).

Charged pion production cross section using 120 GeV/c proton beam on carbon target

Aydin, Gural. Onel, Y. January 2009 (has links)
Thesis supervisor: Onel Yasar. Includes bibliographic references (p. 73-74).

Gamma-rays from aluminum due to proton bombardment

Plain, Gilbert J. Herb, R. G. Hudson, Colin Munroe, Warren, R. E. January 1940 (has links)
Presented as Plain's Thesis (Ph. D.)--University of Wisconsin--Madison, 1940. / Reprinted from Physical review, vol. 57, no. 3 (1 Feb. 1940). Includes bibliographical references.

Nuclear reactions resulting from the proton bombardment of aluminum

Faulkner, John Edward, January 1950 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1950. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Nuclear Halo Effect and Field Size Factor for Pencil-Beam Scanning Proton Therapy

Unknown Date (has links)
In proton therapy systems with pencil-beam scanning, output of Halo effect is not necessarily included in Treatment Planning System (TPS). Halo effect (low-intensity tail) can significantly affect a patient’s dose distribution. The output of this dose depends on the field size being irradiated. Although much research has been made to investigate such relation to the field size, the number of reports on dose calculations including the halo effect is small. In this work we have investigated the Halo effect, including field size factor, target depth factor, and air gaps with a range shifter for a Varian ProBeam. Dose calculations created on the Eclipse Treatment Planning System (vs15.6 TPS) are compared with plane-parallel ionization chambers (PTW Octavius 1500) measurements using PCS and AcurosPT MC model in different isocenters: 5cm, 10cm, and 20cm. We find that in AcurosPT algorithm deviations range between -7.53% (for 2cm field in 25cm air gap with range shifter) up to +7.40% (for 20cm field in 15cm air gap with range shifter). Whereas, in PCS algorithm the deviations are -2.07% (for 20x20cm field in open conditions) to -6.29% (for 20x20cm field in 25cm air gap with range shifter). / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2021. / FAU Electronic Theses and Dissertations Collection

The relative biological effectiveness (RBE) of a 200-MeV clinical proton beam / Timothy Timo Sebeela

Sebeela, Timothy Timo January 2003 (has links)
Cancer therapy with high-energy particles has proved to be beneficial over the last 10 years. Protons are regarded as being more advantageous because of their distinctive physical depth dose distribution that allows dose conformation to the tumor while sparing normal tissue. In this study, the relative biological effectiveness (RBE) values for the 200-MeV clinical proton beam at iThemba LABS were measured at strategic positions along a 5 cm Spread-Out-Bragg-Peak (SOBP). RBE values were evaluated at the initial plateau of the virgin beam (24.2 mm in Perspex), and at the middle part, distal part and distal edge (12.4% max. dose) along the SOBP (depth in Perspex= 161.4, 181.3 and 207.7 mm respectively). Biological systems used were Chinese hamster ovary cells (CHO-Kl) for both cell survival and micronuclei frequencies as well as human T-lymphocytes for micronuclei frequency analysis. (60)^Co y-irradiation served as a reference. Cell survival measurements yielded RBE values of 1.17 at the distal part and 1.62 at the distal edge (12.4 max. dose). For micronuclei analysis, a limiting RBEap+ay value of 1.3 at the distal part was observed. Using T-lymphocytes, RBEap+/ay values calculated were 2.1, 2.7 and 3.2 at the middle part, distal part and distal edge, respectively. These results show an increase in RBE with depth of penetration and are explained by an increase in ionization density at the end of the SOBP. This is influenced by a high fraction of low-energy protons at that position. Protons were found to be most potent per unit dose towards the end as they slow down to a complete stop. It is recommended that an RBE value slightly greater than the current 1.1 be applied in therapy. Also, that the less steep biological effective depth dose curve be taken into account when dose planning. / Thesis (MSc. ARST) North-West University, Mafikeng Campus, 2003

Range-energy measurements for 742-Mev protons

Ward, John E. January 1959 (has links)
Thesis (M.S. in Physics)--United States Naval Postgraduate School, 1959. / "Physics and Mathematics" -t.p. Includes bibliographical references (p. 39).

Verification of patient position for proton therapy using portal X-rays and digitally reconstructed radiographs /

Van der Bijl, Leendert. January 2006 (has links)
Thesis (MSc)--University of Stellenbosch, 2006. / Bibliography. Also available via the Internet.

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