PMID: 1202509Nov 1, 1975Paper

An approach to microdosimetry in a pi- meson beam using nuclear emulsions

Physics in Medicine and Biology
N F KemberA G Perris

Abstract

K5 emulsions 10 mum thick were exposed at various depths in a perspex phantom to a 70 MeV pi- meson beam and counts taken of the tracks in emulsion volumes 7x7x10 mum3. Data are presented on the number of track events and also the total number of grains associated with each event in each of four categories spanning the LET range of the secondary particles. The number of heavy tracks (category 4) shows an increased incidence in the region of the stopping pi- mesons (14-5 cm in perspex) while the number of single grains (category 1) decreases with depth. Categories 2 and 3 (grain clusters and light tracks) are approximately constant with depth. An estimate of the grain sensitivity is obtained by taking the proton as representative of the whole range of secondary particles. This procedure gives a value of 5 keV per grain in the pi- peak. The LET of light tracks was therefore in the range 1-10 keV mum-1 in emulsion, scaling to 0-4-4 keV mum-1 in water. Heavy tracks have LET values in excess of 4 keV mum-1 in water.

References

Apr 1, 1974·European Journal of Cancer : Official Journal for European Organization for Research and Treatment of Cancer (EORTC) [and] European Association for Cancer Research (EACR)·M R Raju
Nov 1, 1974·The British Journal of Radiology·A H NiasD H Reading
Jan 1, 1970·Physics in Medicine and Biology·A C James, N F Kember
Nov 1, 1962·The Journal of Cell Biology·L G CAROJ A KOLB

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Citations

May 1, 1977·Physics in Medicine and Biology·D J Brenner, F A Smith

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