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Tommy Knöös

Sjukhusfysiker

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BE AWARE OF NEUTRONS OUTSIDE SHORT MAZES FROM 10-MV LINEAR ACCELERATORS X-RAYS IN RADIOTHERAPY FACILITIES.

Författare

  • Sara Brockstedt
  • Hanna Holstein
  • L Jakobsson
  • Andrej Tomaszewicz
  • Tommy Knöös

Summary, in English

During the radiation survey of a reinstalled 10-MV linear accelerator in an old radiation treatment facility, high dose rates of neutrons were observed. The area outside the maze entrance is used as a waiting room where patients, their relatives and staff other than those involved in the actual treatment can freely pass. High fluence rates of neutrons would cause an unnecessary high effective dose to the staff working in the vicinity of such a system, and it can be several orders higher than the doses received due to X-rays at the same location. However, the common knowledge appears to have been that the effect of neutrons at 10-MV X-ray linear accelerator facilities is negligible and shielding calculations models seldom mention neutrons for this operating energy level. Although data are scarce, reports regarding this phenomenon are now emerging. For the future, it is advocated that contributions from neutrons are considered already during the planning stage of new or modified facilities aimed for 10 MV and that estimated dose levels are verified.

Avdelning/ar

  • Medicinsk strålningsfysik, Lund
  • Medicinsk strålningsfysik, Malmö

Publiceringsår

2015

Språk

Engelska

Sidor

464-467

Publikation/Tidskrift/Serie

Radiation Protection Dosimetry

Volym

165

Issue

1-4

Dokumenttyp

Artikel i tidskrift

Förlag

Oxford University Press

Ämne

  • Radiology, Nuclear Medicine and Medical Imaging

Status

Published

Forskningsgrupp

  • Medical Radiation Physics, Malmö

ISBN/ISSN/Övrigt

  • ISSN: 1742-3406