Shielding and activation in a 500 MeV H⁻ cyclotron facility

TRIUMF: Canada's national laboratory for particle and nuclear physics

Shielding and activation in a 500 MeV H⁻ cyclotron facility Thorson, I. M.

Abstract

The shielding required for and the residual activity produced in the Tri-University Meson Facility (TRIUMF) are discussed. The facility is based on a 500 MeV H⁻ isochronous cyclotron capable of accelerating 100 μA of beam current. The 10 kW of beam power lost in the cyclotron by electromagnetic dissociation of the negative hydrogen ions will produce residual radiation fields in the cyclotron of the order of 1 rem hr⁻¹ a few hours after shutdown following a long operating period. The estimated shielding required around the periphery of the cyclotron to achieve radiation fields of 2.5 mrem hr⁻¹ at full power is approximately 9 m of concrete. The primary beam dump designed for use as a neutron irradiation facility can produce a useful neutron flux of ~ 5 x 10 cm⁻² s⁻¹ in the graphite moderator surrounding a 10 cm diameter lead or bismuth target.

Item Metadata

Title	Shielding and activation in a 500 MeV H⁻ cyclotron facility
Alternate Title	TRIUMF brown reports TRI-68-4
Creator	Thorson, I. M.
Publisher	TRIUMF
Date Issued	1968-12
Description	The shielding required for and the residual activity produced in the Tri-University Meson Facility (TRIUMF) are discussed. The facility is based on a 500 MeV H⁻ isochronous cyclotron capable of accelerating 100 μA of beam current. The 10 kW of beam power lost in the cyclotron by electromagnetic dissociation of the negative hydrogen ions will produce residual radiation fields in the cyclotron of the order of 1 rem hr⁻¹ a few hours after shutdown following a long operating period. The estimated shielding required around the periphery of the cyclotron to achieve radiation fields of 2.5 mrem hr⁻¹ at full power is approximately 9 m of concrete. The primary beam dump designed for use as a neutron irradiation facility can produce a useful neutron flux of ~ 5 x 10 cm⁻² s⁻¹ in the graphite moderator surrounding a 10 cm diameter lead or bismuth target.
Subject	Design study
Genre	Report
Type	Text
Language	eng
Date Available	2015-08-14
Provider	Vancouver : University of British Columbia Library
Rights	Attribution-NonCommercial-NoDerivs 2.5 Canada
DOI	10.14288/1.0107855
URI	http://hdl.handle.net/2429/54439
Affiliation	TRIUMF; Non UBC
Peer Review Status	Unreviewed
Scholarly Level	Researcher
Copyright Holder	TRIUMF
Rights URI	http://creativecommons.org/licenses/by-nc-nd/2.5/ca/
Aggregated Source Repository	DSpace

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