{"id":{"repo_id":"soton","oai_identifier":"oai:eprints.soton.ac.uk:192561"},"canonical_url":"https://search.dev.ndltd.org/etd/soton/oai:eprints.soton.ac.uk:192561","repository":{"repo_id":"soton","name":"University of Southampton","base_url":"https://eprints.soton.ac.uk/cgi/oai2"},"display":{"title":"Gamma ray astronomy in the low energy range","abstract":"A low energy gamma ray telescope, and the results of its observations are described. The telescope consisted of four sodium iodide crystals, each of 120 cm<sup>2</sup> area, occulted by lead discs. Charged particles are rejected using scintillation, anti-coincidence shields.<br/><br/>The telescope was flown from Palestine, Texas in 1974. Gamma rays were observed from the Crab Nebula, the pulsar NP0 532, and the atmospheric background. No evidence for a gamma ray burst was found, giving an upper limit of less than 5.8 x 10<sup>3</sup> bursts per year of intensity greater than 1.6 x 10<sup>-6</sup> ergs cm<sup>-2</sup>.<br/><br/>Various types of existing, and planned, gamma ray detectors, and successful gamma ray observations are reviewed. Detailed calculations of the detection efficiency of a Double Compton telescope are presented and these results led to the development of the MISO low energy gamma ray telescope.<br/><br/>Preliminary calculations of the detection efficiency of an Anticollimated Double Compton telescope are presented, which suggest that further, more detailed investigation of this type of detector would prove fruitful.","abstract_html":"A low energy gamma ray telescope, and the results of its observations are described. The telescope consisted of four sodium iodide crystals, each of 120 cm&lt;sup&gt;2&lt;/sup&gt; area, occulted by lead discs. Charged particles are rejected using scintillation, anti-coincidence shields.&lt;br/&gt;&lt;br/&gt;The telescope was flown from Palestine, Texas in 1974. Gamma rays were observed from the Crab Nebula, the pulsar NP0 532, and the atmospheric background. No evidence for a gamma ray burst was found, giving an upper limit of less than 5.8 x 10&lt;sup&gt;3&lt;/sup&gt; bursts per year of intensity greater than 1.6 x 10&lt;sup&gt;-6&lt;/sup&gt; ergs cm&lt;sup&gt;-2&lt;/sup&gt;.&lt;br/&gt;&lt;br/&gt;Various types of existing, and planned, gamma ray detectors, and successful gamma ray observations are reviewed. Detailed calculations of the detection efficiency of a Double Compton telescope are presented and these results led to the development of the MISO low energy gamma ray telescope.&lt;br/&gt;&lt;br/&gt;Preliminary calculations of the detection efficiency of an Anticollimated Double Compton telescope are presented, which suggest that further, more detailed investigation of this type of detector would prove fruitful.","abstract_has_math":false,"creators":["Bailey, E.P.A."],"institution":"University of Southampton","degree_name":"Ph.D.","degree_level":"doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1979,"date_issued":"1979-01","date_published":"1979-01","updated_at":"2026-07-24T04:36:28Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Bailey, E.P.A."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["1979-01"]},{"key":"dc:date.issued","label":"Date","values":["1979-01"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Physics & Astronomy (pre 2011 reorg)","Department of Physics"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["University of Southampton"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://eprints.soton.ac.uk/192561/"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["doctoral"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["Ph.D."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://eprints.soton.ac.uk/192561/1/79074931.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["A low energy gamma ray telescope, and the results of its observations are described. The telescope consisted of four sodium iodide crystals, each of 120 cm<sup>2</sup> area, occulted by lead discs. Charged particles are rejected using scintillation, anti-coincidence shields.<br/><br/>The telescope was flown from Palestine, Texas in 1974. Gamma rays were observed from the Crab Nebula, the pulsar NP0 532, and the atmospheric background. No evidence for a gamma ray burst was found, giving an upper limit of less than 5.8 x 10<sup>3</sup> bursts per year of intensity greater than 1.6 x 10<sup>-6</sup> ergs cm<sup>-2</sup>.<br/><br/>Various types of existing, and planned, gamma ray detectors, and successful gamma ray observations are reviewed. Detailed calculations of the detection efficiency of a Double Compton telescope are presented and these results led to the development of the MISO low energy gamma ray telescope.<br/><br/>Preliminary calculations of the detection efficiency of an Anticollimated Double Compton telescope are presented, which suggest that further, more detailed investigation of this type of detector would prove fruitful."]},{"key":"dc:format","label":"Dc Format","values":["text"]},{"key":"dc:title","label":"Title","values":["Gamma ray astronomy in the low energy range"]}]}],"canonical_facts":{"dc:creator":["Bailey, E.P.A."],"dc:date":["1979-01"],"dc:date.issued":["1979-01"],"dc:description.abstract":["A low energy gamma ray telescope, and the results of its observations are described. The telescope consisted of four sodium iodide crystals, each of 120 cm<sup>2</sup> area, occulted by lead discs. Charged particles are rejected using scintillation, anti-coincidence shields.<br/><br/>The telescope was flown from Palestine, Texas in 1974. Gamma rays were observed from the Crab Nebula, the pulsar NP0 532, and the atmospheric background. No evidence for a gamma ray burst was found, giving an upper limit of less than 5.8 x 10<sup>3</sup> bursts per year of intensity greater than 1.6 x 10<sup>-6</sup> ergs cm<sup>-2</sup>.<br/><br/>Various types of existing, and planned, gamma ray detectors, and successful gamma ray observations are reviewed. Detailed calculations of the detection efficiency of a Double Compton telescope are presented and these results led to the development of the MISO low energy gamma ray telescope.<br/><br/>Preliminary calculations of the detection efficiency of an Anticollimated Double Compton telescope are presented, which suggest that further, more detailed investigation of this type of detector would prove fruitful."],"dc:format":["text"],"dc:identifier.uri":["https://eprints.soton.ac.uk/192561/1/79074931.pdf"],"dc:publisher.department":["Physics & Astronomy (pre 2011 reorg)","Department of Physics"],"dc:publisher.institution":["University of Southampton"],"dc:relation.isreferencedby":["https://eprints.soton.ac.uk/192561/"],"dc:title":["Gamma ray astronomy in the low energy range"],"dc:type":["Thesis"],"dc:type.qualificationlevel":["doctoral"],"dc:type.qualificationname":["Ph.D."]},"updated_at":"2026-07-24T04:36:28Z"}