Calculation of Neutron-Induced Physical Doses in Human Tissues.

Ritts, J.J.; Solomito, M.; Stevens, P.N.

doi:10.2172/4118723

Cited by 3 publications

(2 citation statements)

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“…LET intervals for protons, alphas and heavy recoils were taken as 5 keV pm-1, 10 keV pm-l and 20 keV pm-l respectively for unit density tissue. The composition given by ICRU (1971) was used for tissue and that of Ritts, Solomito and Stevens (1970) for bone.…”

Section: Methodsmentioning

confidence: 99%

Computed LET distributions in the build-up region of tissue for 14 MeV neutrons

Bhatia

Nagarajan

1979

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Experimental radiobiological investigations of fast neutron beams involve irradiation of thin cell layers. The irradiation of cells is done either in free air or with a material such as graphite, TE plastic or bone-equivalent plastic covering the cells. This paper discusses the computed dose distributions in LET at shallow depths between 5 or 10 micrometers and the equilibrium depth, and the influence of the overlying materials on the distributions. The secondaries considered are elastic recoils of H, C, N and O, and 22 alpha particle groups and the corresponding heavy recoils arising from (n, alpha) events in C, N, O, P and Ca. Dose-average LET and curves of detailed dose distributions in LET as a function of depth in tissue are given for various overlying materials.

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Section: Methodsmentioning

confidence: 99%

Computed LET distributions in the build-up region of tissue for 14 MeV neutrons

Bhatia

Nagarajan

1979

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“…Ritts, Solomito and Stevens (1970) also give values for other elements, but only up to 15 MeV. The ratio of kerma in wet tissue(ICRU 1961) to that in the central element, averaged over Parnell's neutron spectrum, is 0.965 byBach and Caswell, 0.981 by Ritts et al, extrapolated to 18 MeV, and 0-961 by Bach and Caswell for H, C, PIT, 0 with Ritt's et al for the other elements.…”

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confidence: 83%

Neutron dosimetry with a calorimeter

Bewley

Page

McCullough

et al. 1974

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A calorimeter has been used to measure the absorbed dose in tissue from a beam of fast neutrons. The calorimeter is of the twin type and is made of tissue-equivalent plastic. The calorimeter was calibrated electrically using the electrical resistivity of the plastic. The partial dose due to gamma -radiation was measured separately with photographic film in order to derive the neutron dose alone. The results were compared with those found using ionization chambers. Satisfactory results were only obtained after pre-irradiation of the plastic by at least 100 krad of electrons. The accuracy obtainable by the calorimetric method seems similar to or slightly better than that obtainable with ionization chambers.

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