2026-09-23T15:23:18Zhttps://bura.brunel.ac.uk/oai/request

oai:bura.brunel.ac.uk:2438/54062014-11-01T12:31:00Zcom_2438_23com_2438_58com_2438_8621com_2438_8620col_2438_3672col_2438_186col_2438_8623

Hobson, PR Price, Timothy James 2011-06-24T13:03:01Z 2011-06-24T13:03:01Z 1994 http://bura.brunel.ac.uk/handle/2438/5406 This thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University. Hafnium based Heavy Metal Fluoride glasses have been produced and evaluated in a search for new dense scintillating materials. The principal motivation was the electromagnetic calorimeter of the Compact Muon Solenoid (CMS), a proposed detector for the Large Hadron Collider (LHC) at CERN, Geneva. Incorporating CeF 3 in these transparent glasses results in scintillators with fast time constants that are typical of crystalline CeF 3. Typical decay components of 9 ns (30 %) and 25 ns (70 %) have been measured. To record the time distribution of scintillation light, an extension to the single-photon method, has been developed, it is optimised for materials with low light output. An alternative acquisition system which used a Multi-Channel Scaler has been critically evaluated for this application. A low dose rate (1.2 rads- I) 60CO irradiation has been used to determine the radiation tolerance of the glasses. Radiation induced optical absorbance was predominantly located in the UV with tails extending into the visible region. These glasses show partial recovery of optical absorbance at room temperature. Compositional optimisation has shown that Indium and Cerium enhance radiation tolerance. Submitted by Lesh Gowreesunker (lesh.gowreesunker@brunel.ac.uk) on 2011-06-24T13:02:43Z No. of bitstreams: 1 Fulltext.pdf: 29468297 bytes, checksum: f82d5553c9490f0f22e739d80900df16 (MD5) Approved for entry into archive by Lesh Gowreesunker(lesh.gowreesunker@brunel.ac.uk) on 2011-06-24T13:03:01Z (GMT) No. of bitstreams: 1 Fulltext.pdf: 29468297 bytes, checksum: f82d5553c9490f0f22e739d80900df16 (MD5) Made available in DSpace on 2011-06-24T13:03:01Z (GMT). No. of bitstreams: 1 Fulltext.pdf: 29468297 bytes, checksum: f82d5553c9490f0f22e739d80900df16 (MD5) en Brunel University Institute for the Environment PhD Theses http://bura.brunel.ac.uk/bitstream/2438/5406/1/FulltextThesis.pdf Development of dense scintillating hard fluoride glasses for the electromagnetic caorimeter of the proposed compact muon solenoid Thesis