Study of a Li doped CsI scintillator crystal as a neutron detector

37th Brazilian Meeting on Nuclear Physics

Filho, T. Madi^1 ; Pereira, M.C.C.^1 ; Berretta, J.R.^1 ; Cárdenas, J.P.N.^1

Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN-SP, Av. Prof. Lineu Prestes 2242 Cidade Universitária, São Paulo-SP

CEP: 05508-000, Brazil^1

关键词: Detecting systems;    Lithium doping;    Nuclear research reactor;    Radiation monitoring;    Radiation monitoring system;    Reactor systems;    Scintillator crystals;    Work environments;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/630/1/012010/pdf
DOI  :  10.1088/1742-6596/630/1/012010

来源: IOP

【 摘 要 】

The radiation monitoring system is an important requirement in the premises of a nuclear reactor. A variety of types of radiation (neutrons. gamma. beta and fission products) exist in a reactor. associated to the broad energy spectrum of these radiations. implying the need of detectors to be used in the reactor system and security. as well as radiation monitoring. As the neutron sources are associated to gamma radiation. it is necessary that the neutron detecting system may be capable to discriminate the gamma interference. In our work environment. there are two Nuclear Research Reactors and a neutron irradiator with two AmBe sources (592GBq of Am. each). These conditions warrant the development of new types of detectors. Due to the absence of charge in the neutron. it is necessary to use a converter material that generates radiations capable to produce signals in the detector. Materials with high cross section. like Li or B. are used for this purpose. The CsIcrystal doped with6Li has been studied. The concentration of the lithium doping element (Li) studied was 10-3M. The detector test was done using an AmBe source (37GBq) and gamma sources. The crystal was coupled to a photomultiplier.