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

Brockstedt, Sara LU ; Holstein, Hanna LU ; Jakobsson, L; Tomaszewicz, Andrej LU and Knöös, Tommy LU (2015) In Radiation Protection Dosimetry 165(1-4). p.464-467
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Radiation Protection Dosimetry
volume
165
issue
1-4
pages
464 - 467
publisher
Nuclear Technology Publishing
external identifiers
  • pmid:25802465
  • wos:000358449300101
  • scopus:84939516055
ISSN
1742-3406
DOI
10.1093/rpd/ncv046
language
English
LU publication?
yes
id
3ac2ac88-a609-4efa-8b86-bea514493f1d (old id 5257782)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/25802465?dopt=Abstract
date added to LUP
2015-04-05 13:29:57
date last changed
2017-08-13 03:08:19
@article{3ac2ac88-a609-4efa-8b86-bea514493f1d,
  abstract     = {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.},
  author       = {Brockstedt, Sara and Holstein, Hanna and Jakobsson, L and Tomaszewicz, Andrej and Knöös, Tommy},
  issn         = {1742-3406},
  language     = {eng},
  number       = {1-4},
  pages        = {464--467},
  publisher    = {Nuclear Technology Publishing},
  series       = {Radiation Protection Dosimetry},
  title        = {BE AWARE OF NEUTRONS OUTSIDE SHORT MAZES FROM 10-MV LINEAR ACCELERATORS X-RAYS IN RADIOTHERAPY FACILITIES.},
  url          = {http://dx.doi.org/10.1093/rpd/ncv046},
  volume       = {165},
  year         = {2015},
}