Individualized Lung Shields Constructed from Lead Shot Embedded in Plastic

Maruyama, Yosh; Moore, Vaughn C.; Burns, Dennis J.; Hilger, M.

doi:10.1148/92.3.634

Cited by 10 publications

(3 citation statements)

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“…Treatment planning using conventional radiation is a complex operation [27,55], and uses single and multiple fields, rotation or arc therapy, wedges, boluses and compensators [41] as well as complex blocks and shielding devices [49], and patient immobilizers [12] to confine therapeutic dose to tumor bearing volumes and to reduce dose to adjacent normal or radiosensitive normal structures. A characteristic of X-and y-rays is the large scattered radiation component which makes the delivery of a sharply defined thera peutic dose volume ( fig.…”

Section: Problems In Radiotherapymentioning

confidence: 99%

Radiobiological Considerations for Pions in Radiotherapy

Feola¹,

Maruyama²

1971

Oncology

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A new radiation beam, the π – meson beam, is being considered for radiotherapy of human neoplasms. It is clear that this beam has special attributes which make it useful in certain types of neoplasms. However, human experience is heavily based upon low LET beams, alterations of dose rate and treatment, planning to confine dose to required therapeutic volumes. The use of this new beam must be considered upon existing knowledge regarding the natural history of the neoplasms, and the expected biological properties of the pion beam. It is likely that revision of present fractionation schedules will be required but most likely the pions will be useful to treat the residual tumor core of a tumor reduced in size by prior external beam, low LET therapy.

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Section: Problems In Radiotherapymentioning

confidence: 99%

Radiobiological Considerations for Pions in Radiotherapy

Feola¹,

Maruyama²

1971

Oncology

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“…A thermoplastic shielding material was introduced by Maruyama et al [6] which consisted of lead shot embedded in a matrix of a tooling wax (M. Argüeso & Co., "Rigidax"). A similar composition, described by Haskell [7], was a thermoplastic dental wax (Moyco Industries "impression compound") loaded with bismuth powder, chosen for its low toxicity.…”

Section: Introductionmentioning

confidence: 99%

“…In low background experiments, a key requirement is the absence of radioactive impurities in the shielding, consequently the formulations based on waxes [6,7] were not usable. These waxes contain high proportions of mineral fillers which would be expected to contain unacceptable levels of uranium and thorium.…”

Section: Introductionmentioning

confidence: 99%

Radiation shielding composites using thermoplastic polymers mouldable at low temperature

McMillan

2019

Preprint

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The formulation of a low temperature thermoplastic mouldable radiation shielding composite is given. The material is based on a low temperature melting polymer filled with lead shot. It can be easily moulded to shape after immersing in hot water, or by using a hot air gun. When cooled it is a rigid self supporting mass. Alternative formulations to provide low background or low toxicity gamma shielding or neutron shielding are also considered.

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