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Novel developments in the MOSFET dosemeter for neutron dosimetry applications.

Price, Robert A. and Benson, Chris and Joyce, Malcolm J. and Kestell, David J. and Silvie, Jon (2004) Novel developments in the MOSFET dosemeter for neutron dosimetry applications. Radiation Protection Dosimetry, 110 (1-4). pp. 283-290.

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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.

Item Type: Article
Journal or Publication Title: Radiation Protection Dosimetry
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: Faculty of Science and Technology > Engineering
ID Code: 20129
Deposited By: ep_ss_importer
Deposited On: 10 Dec 2008 15:31
Refereed?: No
Published?: Published
Last Modified: 24 Jan 2014 05:14
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/20129

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