Abstract:
:The feasibility of large-geometry Metal Oxide Semiconductor Field Effect Transistor (MOSFET) devices has been assessed for both active and passive neutron dosimetry and use in radiotherapy environments. Neutron sensitivity has been enhanced with the use of polymeric cement surrounding the gate region. Neutron activation via nuclear interaction processes is a potential problem with conventionally packaged and fabricated devices. To overcome this problem, a unique low-activation device design is described. Standard Dual in-Line devices, modified with polymeric cement and boron loaded cement have been exposed to gamma rays (60Co) and neutrons (gamma-ray shielded 252Cf) to provide neutron sensitivity estimates. The results show that the neutron sensitivity can be increased by a factor of approximately three by the use of a thin layer of polymeric cement over the gate region. Essentially zero activation is observed in the activation-reduced design compared with 1000 cps in the conventional design MOSFET when both are exposed under identical conditions to a neutron field from a gamma-ray shielded 252Cf isotopic source.
journal_name
Radiat Prot Dosimetryjournal_title
Radiation protection dosimetryauthors
Price RA,Benson C,Joyce MJ,Kestell DJ,Silvie Jdoi
10.1093/rpd/nch202keywords:
subject
Has Abstractpub_date
2004-01-01 00:00:00pages
283-90issue
1-4eissn
0144-8420issn
1742-3406pii
110/1-4/283journal_volume
110pub_type
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