Radiation hazards in PF-1000 plasma generator fusion research (part 3)

Szewczak, Kamil; Jednoróg, S.

doi:10.1007/s10967-016-4700-1

J Radioanal Nucl Chem

2016

DOI: 10.1007/s10967-016-4700-1

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Radiation hazards in PF-1000 plasma generator fusion research (part 3)

Kamil Szewczak

S. Jednoróg

Abstract: Plasma experiments conducted on the PF-1000 device generate the release of neutrons and ionizing radiation that are the source of immediate exposure to personnel. Neutron activation of materials in the research device and the surroundings is a source of ongoing radiation exposure to the same personnel. Having reported on personnel exposure from ionizing radiation and neutron activation, we now aim to characterize exposure from direct neutron emission generated by the device, and describe the process of ensurin… Show more

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Cited by 2 publications

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A New Application of Sohrabi Albedo Neutron Dosimeters around a Plasma Focus Device

Sohrabi

Soltani

2020

Health Physics

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A new application of the Sohrabi albedo neutron dosimeters is reported for the first time for determination of very low-level neutron ambient dose equivalents on and around a 3.5 kJ plasma focus device (PFD). The Sohrabi dosimeters basically use a polycarbonate track detector as bare and/or in contact with 10B convertor(s) under special cadmium cover arrangements. Its sensitivity was improved by using enriched 10B under new cadmium arrangements in order to detect epithermal neutrons in addition to fast and thermal neutrons. Results of 12 dosimeters installed externally around the PFD at different azimuthal (φ) and polar (θ) angles showed that azimuthal (φ) fast, epithermal, thermal, and total neutron ambient dose equivalents were symmetric and isotropic, respectively, with values 55.15 ± 8.36, 1.36 ± 02, 0.53 ± 03, and 57.04 ± 8.62 μSv/shot at ~25 cm from anode top. Polar (θ) neutron ambient dose equivalent values on z-axis relative to 90o angle were relatively higher. Results of 38 dosimeters placed on PFD facility walls for workplace monitoring and on a BOMAB phantom at operator’s location for personal dose equivalent determination showed values below minimum detection limits after exposure to 130 PFD shots. However, an operator’s personal dose equivalents at ~1.0 and ~3.0 m from the anode top were estimated to be, respectively, ~13.7 and ~1.52 mSv y−1 using azimuthal angle (φ) values if the PFD operates, for example, up to 20 shots per day for 200 d y−1. Even under such an extreme assumption, annual personal dose equivalent is still much below 20 mSv, the annual ICRP dose limit for workers.

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A New Application of Sohrabi Albedo Neutron Dosimeters around a Plasma Focus Device

Sohrabi

Soltani

2020

Health Physics

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Influence of electromagnetic pollution of the electron beam generator and high-energy radioactive source on the memory components

et al. 2023

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The study considers the impact of the environmental contamination by the electromagnetic radiation of electron beam generator and high-energy radioactive source on the memory components. Electron beam generator can be used for injecting particle energy into the plasma of the fusion system based on a Marx generator, while radioactive source as a simulator of high-energy ionizing radiation that can be caused by the neutron-induced activation of plasma surrounding structures or released from deuterium-tritium fusion reaction. The effects of gamma radiation of high-energy radioactive source and electric field of the electron beam generator on EPROM and EEPROM semiconductor computer memory, were investigated. An older memory types were deliberately chosen for the reason that their more robust construction will better protect them from the effects of ionizing and non-ionizing radiation. The results obtained under well-controlled conditions show a high degree of non-resistance of the semiconductor technology to the expected electromagnetic pollution of the electron beam generator and high-energy radioactive source. This conclusion raises doubts on the possibility of simultaneous application of electron beam generator, consequently fusion system and nanotechnologies with the increasing need for miniaturization of electronic components.

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Radiation hazards in PF-1000 plasma generator fusion research (part 3)

Cited by 2 publications

References 8 publications

A New Application of Sohrabi Albedo Neutron Dosimeters around a Plasma Focus Device

A New Application of Sohrabi Albedo Neutron Dosimeters around a Plasma Focus Device

Influence of electromagnetic pollution of the electron beam generator and high-energy radioactive source on the memory components

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