{"id":{"repo_id":"sask","oai_identifier":"oai:harvest.usask.ca:10388/etd-07062012-113551"},"canonical_url":"https://search.dev.ndltd.org/etd/sask/oai:harvest.usask.ca:10388/etd-07062012-113551","repository":{"repo_id":"sask","name":"University of Saskatchewan","base_url":"https://harvest.usask.ca/server/oai/request"},"display":{"title":"Measurement of the spectra of multiply-scattered radiation in a medium irradiated with Co60 gamma rays","abstract":"A knowledge of the spectral distribution of scattered radiation at a point is of value in planning effective radiation therapy and adequate personnel protection. Some spectra have been calculated theoretically or measured experimentally for a few particular irradiation conditions. In this investigation, the spectral distributions of multiply-scattered Co60 radiation were measured at depths of 2 cm., 5 cm., 10 cm. and 15 cm. in tissue-equivalent material with beam areas of 25 cm.2 and 100 cm.2. Total-scatter spectra, including both singly- and multiply-scattered radiation, were measured at various angles. Then, upon subtraction of the single-scatter spectra contribution from the total-scatter spectra, multiple-scatter spectra were obtained. The integrated and corrected multiple-scatter spectra were compared to corresponding spectra derived from data calculated by Bruce using the Monte Carlo method. The shapes of the experimental multiple-scatter spectra show fair agreement with Bruce's theoretical spectra. The greatest discrepancy between the spectra occurs in the low-energy end of the spectra. For all measured depths and beam areas the theoretical low-energy peaks appear at an energy from 10 to 30 KeV higher than that of the experimental peaks.","abstract_html":"A knowledge of the spectral distribution of scattered radiation at a point is of value in planning effective radiation therapy and adequate personnel protection. Some spectra have been calculated theoretically or measured experimentally for a few particular irradiation conditions. In this investigation, the spectral distributions of multiply-scattered Co60 radiation were measured at depths of 2 cm., 5 cm., 10 cm. and 15 cm. in tissue-equivalent material with beam areas of 25 cm.2 and 100 cm.2. Total-scatter spectra, including both singly- and multiply-scattered radiation, were measured at various angles. Then, upon subtraction of the single-scatter spectra contribution from the total-scatter spectra, multiple-scatter spectra were obtained. The integrated and corrected multiple-scatter spectra were compared to corresponding spectra derived from data calculated by Bruce using the Monte Carlo method. The shapes of the experimental multiple-scatter spectra show fair agreement with Bruce's theoretical spectra. The greatest discrepancy between the spectra occurs in the low-energy end of the spectra. For all measured depths and beam areas the theoretical low-energy peaks appear at an energy from 10 to 30 KeV higher than that of the experimental peaks.","abstract_has_math":false,"creators":["Derbowka, Robert Michael"],"institution":"University of Saskatchewan","degree_name":"Master of Arts (M.A.)","degree_level":"Masters","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":[],"advisors":["Cormack, D.V."],"committee_chairs":[],"committee_members":["Woods, R.J."],"year":1964,"date_issued":"1964-02","date_published":"1964-02","updated_at":"2026-07-24T04:27:18Z","subjects":[],"languages":["en_US"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/10388/etd-07062012-113551","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Cormack, D.V."]},{"key":"dc:contributor.committeemember","label":"Committee Member","values":["Woods, R.J."]},{"key":"dc:creator","label":"Author","values":["Derbowka, Robert Michael"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2012-07-06T11:35:51Z","2013-01-04T04:42:33Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2013-07-06T08:00:00Z","2013-01-04T04:42:33Z"]},{"key":"dc:date.issued","label":"Date","values":["1964-02"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Arts (M.A.)"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Saskatchewan"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_US"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/10388/etd-07062012-113551"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["A knowledge of the spectral distribution of scattered radiation at a point is of value in planning effective radiation therapy and adequate personnel protection. Some spectra have been calculated theoretically or measured experimentally for a few particular irradiation conditions. In this investigation, the spectral distributions of multiply-scattered Co60 radiation were measured at depths of 2 cm., 5 cm., 10 cm. and 15 cm. in tissue-equivalent material with beam areas of 25 cm.2 and 100 cm.2. Total-scatter spectra, including both singly- and multiply-scattered radiation, were measured at various angles. Then, upon subtraction of the single-scatter spectra contribution from the total-scatter spectra, multiple-scatter spectra were obtained. The integrated and corrected multiple-scatter spectra were compared to corresponding spectra derived from data calculated by Bruce using the Monte Carlo method. The shapes of the experimental multiple-scatter spectra show fair agreement with Bruce's theoretical spectra. The greatest discrepancy between the spectra occurs in the low-energy end of the spectra. For all measured depths and beam areas the theoretical low-energy peaks appear at an energy from 10 to 30 KeV higher than that of the experimental peaks."]},{"key":"dc:title","label":"Title","values":["Measurement of the spectra of multiply-scattered radiation in a medium irradiated with Co60 gamma rays"]}]}],"canonical_facts":{"dc:contributor.advisor":["Cormack, D.V."],"dc:contributor.committeemember":["Woods, R.J."],"dc:creator":["Derbowka, Robert Michael"],"dc:date.accessioned":["2012-07-06T11:35:51Z","2013-01-04T04:42:33Z"],"dc:date.available":["2013-07-06T08:00:00Z","2013-01-04T04:42:33Z"],"dc:date.issued":["1964-02"],"dc:description.abstract":["A knowledge of the spectral distribution of scattered radiation at a point is of value in planning effective radiation therapy and adequate personnel protection. Some spectra have been calculated theoretically or measured experimentally for a few particular irradiation conditions. In this investigation, the spectral distributions of multiply-scattered Co60 radiation were measured at depths of 2 cm., 5 cm., 10 cm. and 15 cm. in tissue-equivalent material with beam areas of 25 cm.2 and 100 cm.2. Total-scatter spectra, including both singly- and multiply-scattered radiation, were measured at various angles. Then, upon subtraction of the single-scatter spectra contribution from the total-scatter spectra, multiple-scatter spectra were obtained. The integrated and corrected multiple-scatter spectra were compared to corresponding spectra derived from data calculated by Bruce using the Monte Carlo method. The shapes of the experimental multiple-scatter spectra show fair agreement with Bruce's theoretical spectra. The greatest discrepancy between the spectra occurs in the low-energy end of the spectra. For all measured depths and beam areas the theoretical low-energy peaks appear at an energy from 10 to 30 KeV higher than that of the experimental peaks."],"dc:identifier.uri":["https://hdl.handle.net/10388/etd-07062012-113551"],"dc:language.iso":["en_US"],"dc:title":["Measurement of the spectra of multiply-scattered radiation in a medium irradiated with Co60 gamma rays"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Masters"],"thesis:degree_name":["Master of Arts (M.A.)"],"thesis:institution_name":["University of Saskatchewan"]},"updated_at":"2026-07-24T04:27:18Z"}