Calculated Depth Dose Curves in Tissue for Broad Beams of Fast Neutrons

Snyder, W.S.; Neufeld, Jacob

doi:10.1259/0007-1285-28-331-342

Cited by 58 publications

(21 citation statements)

References 2 publications

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“…The difference is very likely due to the secondary gamma generated by neutron interactions in the phantom. This additional dose in phantom does not exceed theoretically 10% of the neutron dose under 1 cm of tissue (27) . However, considering the uncertainties, the phantom in¯uence can be considered as negligible in this range of dose.…”

Section: Tooth Enamelmentioning

confidence: 73%

EPR dosimetry in a mixed neutron and gamma radiation field

Trompier¹,

Fattibene²,

Tikunov³

et al. 2004

Radiation Protection Dosimetry

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Suitability of Electron Paramagnetic Resonance (EPR) spectroscopy for criticality dosimetry was evaluated for tooth enamel, mannose and alanine pellets during the`international intercomparison of criticality dosimetry techniques' at the SILENE reactor held in Valduc in June 2002, France. These three materials were irradiated in neutron and gamma-ray ®elds of various relative intensities and spectral distributions in order to evaluate their neutron sensitivity. The neutron response was found to be around 10% for tooth enamel, 45% for mannose and between 40 and 90% for alanine pellets according their type. According to the IAEA recommendations on the early estimate of criticality accident absorbed dose, analyzed results show the EPR potentiality and complementarity with regular criticality techniques.

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Section: Tooth Enamelmentioning

confidence: 73%

EPR dosimetry in a mixed neutron and gamma radiation field

Trompier¹,

Fattibene²,

Tikunov³

et al. 2004

Radiation Protection Dosimetry

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“…(l3) At depths less than 24 cm, they showed that gamma dose from wide beams was considerably higher (up to 30% greater) than that calculated by SNYDER and NEUFELD. ( 3 ) The recent calculations of JONES et ul, (14) for a cylindrical phantom with collimated beams of neutrons of 2.5 and 5.0 MeV show that the recoil-ion dose component produced by scattered neutrons drops off rapidly with distance beyond the limits of the collimated beam. This feature of fast-neutron depth dose measurements with collimated beams is found also in the work of LAWSON and WATT.…”

Section: Previous Workmentioning

confidence: 97%

Angular Dependence of the Components of Dose to the Bone Marrow and Abdomen in a Human Phantom from 2.95-MeV Neutrons

Facey¹,

Clifford²

1973

Health Physics

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Gamma and recoil-ion dose measurements were carried out in a human-shaped phantom exposed to whole-body monoenergetic neutrons at 2.95 MeV. For the gamma component miniature, energy-compensated, thermoluminescent dosimeters of CaF,:Dy were used inside bones to measure the bone-marrow dose. For abdominal dose and surface dose, a small Geiger chamber was used to supplement the T L system. Proportional counters were used for the recoil-ion measurements. The dose components were measured as a function of both the angle of phantom rotation and the angle of elevation of the incident radiation. The significance of the gamma component of the fast-neutron dose is discussed, and it is shown to be of particular importance with respect to incident neutron energies of 3 MeV and below, to off-normal angles of irradiation, and to the low values of the quality factors required for acute effects of radiation dose. Internal recoil-ion dose may be predicted within a factor of two from calculations. The study shows the very large effect due to the angle of incidence of the neutron radiation, and it suggests that the chest is an unsuitable badge location for practical accident dosimetry.

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“…This investigation employed a variety of different dose fractions and partial RBE averages simulating the effects of different incident neutron beams and depths of interest. In this calculation, in which the proton component is dominate, but the others are also important, a softer incident neutron beam or a larger depth corresponded (on the basis of pilot calculations by this investigator and information in the literature (5,6,7,8) to a somewhat larger value of Rp. The resulting overall RBE averages for all cases-considered remained nearly constant in value with a slight tendency (a few percent) of RBE to increase with increasing depth or with softer incident neutron beam.…”

mentioning

confidence: 91%

“…In order to test the predicted behavior, experimentation was extended to cover three oxygen gas concentrations (8,6,4%) and two radiation doses.…”

mentioning

confidence: 99%