Pion Stopping Region Visualization Experiments

Dean, Phillip N.; Holm, D.M.

doi:10.2307/3573305

Cited by 7 publications

(1 citation statement)

References 2 publications

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“…Three methods of visualisation have shown potential for moqitoring stopping pions: (1) pi-mesic x-rays using an Anger camera (Dean and Holm 1971); (2) prompt high energy gamma rays being viewed by spark chambers (Sperinde et al1970) or multi-wire proportional counters (Paciotti, private communication); and (3) positron emitting radionuclides being viewed by conventional positron cameras (Taylor et af 1970). We have chosen to study the positron method, as methods (1) and (2) must be carried out during patient irradiation, leading to high background problems.…”

Section: Introductionmentioning

confidence: 99%

Diffusion rates of positron emitters in pion irradiated patients

Hogstrom

Rosen

1980

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Section: Introductionmentioning

confidence: 99%

Diffusion rates of positron emitters in pion irradiated patients

Hogstrom

Rosen

1980

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Negative Pions

Raju

1980

Heavy Particle Radiotherapy

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Dose and LET distributions due to neutrons and photons emitted from stopped negative pions

Brenner

Smith

1977

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Computer calculations are made of the dose and LET distributions due to neutrons and photons produced when negative pions are stopped in a phantom. When negative pions are stopped in a material they undergo nuclear capture, resulting in the disintegration of the nucleus and the emission of short range charged particles and longer range neutrons and photons. The uncharged radiation constitutes a potentially large source of dose outside the treatment volume. A simple phantom consisting of a 0-25 m cube of either tissue or bone-equivalent material is set up with a 0-05 m cube in the centre to represent the treatment volume. Neutrons and photons are started in this central volume and transported across the phantom using Monte Carlo transport codes. Several different initial energy spectra for the neutrons are used, taken from experimental and theoretical data. These different spectra are found to give significant differences in dose, though the distance to the 80% dose level is always about 0-015 m. Order of magnitude differences in some LET regions are also found. The dose deposited by neutrons in bone is about 24% less than in soft tissue, the photon dose being small compared with the neutron dose.

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Pion Stopping Region Visualization Experiments

Cited by 7 publications

References 2 publications

Diffusion rates of positron emitters in pion irradiated patients

Diffusion rates of positron emitters in pion irradiated patients

Negative Pions

Dose and LET distributions due to neutrons and photons emitted from stopped negative pions

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