Fast neutron spectroscopy using CR-39 track detectors

El-Sersy, A.R.; Eman, S.A.; Khaled, N. E.

doi:10.1016/j.nimb.2004.06.023

Cited by 21 publications

(8 citation statements)

References 7 publications

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“…Very low dose rate was applied to the posterior portions of the rats from 185 GBq (5 Ci) 241 Am-Be neutron source capsule X.14 (code AMN.24) (Amersham International PLC, Buckinghamshire, England). 241 Am-Be neutron source emits spectrum neutrons from 0 up to 11 MeV [ 18 , 19 ] and an average energy around 4.5 MeV [ 8 , 20 , 21 ]. The neutron emission of the source is 1.1 × 10 7 n s −1 with tolerance of around 10 %.…”

Section: Methodsmentioning

confidence: 99%

Effects of Very Low Dose Fast Neutrons on Cell Membrane And Secondary Protein Structure in Rat Erythrocytes

et al. 2015

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The effects of ionizing radiation on biological cells have been reported in several literatures. Most of them were mainly concerned with doses greater than 0.01 Gy and were also concerned with gamma rays. On the other hand, the studies on very low dose fast neutrons (VLDFN) are rare. In this study, we have investigated the effects of VLDFN on cell membrane and protein secondary structure of rat erythrocytes. Twelve female Wistar rats were irradiated with neutrons of total dose 0.009 Gy (241Am-Be, 0.2 mGy/h) and twelve others were used as control. Blood samples were taken at the 0, 4th, 8th, and 12th days postirradiation. Fourier transform infrared (FTIR) spectra of rat erythrocytes were recorded. Second derivative and curve fitting were used to analysis FTIR spectra. Hierarchical cluster analysis (HCA) was used to classify group spectra. The second derivative and curve fitting of FTIR spectra revealed that the most significant alterations in the cell membrane and protein secondary structure upon neutron irradiation were detected after 4 days postirradiation. The increase in membrane polarity, phospholipids chain length, packing, and unsaturation were noticed from the corresponding measured FTIR area ratios. This may be due to the membrane lipid peroxidation. The observed band shift in the CH2 stretching bands toward the lower frequencies may be associated with the decrease in membrane fluidity. The curve fitting of the amide I revealed an increase in the percentage area of α-helix opposing a decrease in the β-structure protein secondary structure, which may be attributed to protein denaturation. The results provide detailed insights into the VLDFN effects on erythrocytes. VLDFN can cause an oxidative stress to the irradiated erythrocytes, which appears clearly after 4 days postirradiation.

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Section: Methodsmentioning

confidence: 99%

Effects of Very Low Dose Fast Neutrons on Cell Membrane And Secondary Protein Structure in Rat Erythrocytes

et al. 2015

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“…All these interactions were considered in this work, but it was shown that the number of created protons is 0.0483 from incident neutron, while the number of created alpha particle is only 0.000354. In other words, probability for alpha particles creation is less than 0.7% in respect to all secondary particles and could be neglected [2,4,8]. The (n, p) reaction occurs on the C nucleus if neutron energy is larger than 10.24 MeV, so it is neglected with considered Am-Be source.…”

Section: Neutron Interaction Within Padcmentioning

confidence: 99%

“…Solid state nuclear track detectors (SSNTDs) have been successfully applied in neutron and ion particle detection [1][2][3]. One of the most widely used SSNTDs is made of polyallyldiglycol carbonate (PADC), generally known by its trade mark CR-39.…”

Section: Introductionmentioning

confidence: 99%

Computer program Neutron_CR-39 for simulation of neutrons from an Am–Be source and calculation of proton track profiles

Milenkovic

Stevanović

Nikezić

et al. 2011

Computer Physics Communications

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“…In the neutron irradiation facility, it's very important to study the room design, scattering contribution, and air attenuation because they use different distances through the calibration processes. The room in-scattering measurements are performed using the shadow cone method [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Characterization of NIS neutron irradiation facility for calibration and metrological application

El-Sersy

Sayed

Nagib

et al. 2021

Int. J. Metrol. Qual. Eng.

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In this study, the Neutron Irradiation Facility (NIF) of the National Institute of Standards (NIS) was characterized for metrological applications to improve the accuracy of the calibration process. The NIS neutron irradiation facility consists of a 5 Ci Am-Be and 0.1 μg Cf-252 sources. The flux and dose rate of the Am-Be source was calculated by using MCNP5 code simulation at different distances from the source. The dose rate delivered by the source was determined using NM2-neutron monitor at different source-to-detector distances. A comparison between the measured and the calculated dose rate was performed and the deviation between them was explained in the skeletal arrangement of room scattering contribution. A shadow cone was designed and constructed to determine the scattering contribution at different source-to-detector distances. The optimum source-distance used for calibration was specified. It was found that the Am-Be calculated flux vary with distances from about 107–104 (n/cm2.S−1). The measured and the calculated dose rates were in agreement up to 150 cm distance from the source center after which the measured dose was greater than that calculated. The determined neutron scattering calculated from the measured-to-calculate dose ratio increased from 7% to 25% with increased distances from 150 to 300 cm. Moreover, the standard dose used in the calibration should be measured by a standard neutron monitor at each distance due to the higher value of the room scattering contribution where the optimum distance for calibration was 150 cm. The combined uncertainty of the measured neutron dose was 4.04%.

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Fast neutron spectroscopy using CR-39 track detectors

Cited by 21 publications

References 7 publications

Effects of Very Low Dose Fast Neutrons on Cell Membrane And Secondary Protein Structure in Rat Erythrocytes

Effects of Very Low Dose Fast Neutrons on Cell Membrane And Secondary Protein Structure in Rat Erythrocytes

Computer program Neutron_CR-39 for simulation of neutrons from an Am–Be source and calculation of proton track profiles

Characterization of NIS neutron irradiation facility for calibration and metrological application

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