In this work, we focus on the buildup correction of dose calculation using Tchebyshev wavelets in the Tunisian gamma irradiation facility. The buildup effect of gamma rays was used to adjust absorbed ...dose calculation for different depth in two irradiated products (water and lPropane).
•A buildup correction method of calculated dose using Tchebyshev wavelets is presented.•Corrected absorbed dose is calculated for lPropane and water.•Buildup effect of gamma rays was used to adjust absorbed dose calculation for different depth for lPropane and water.
•We assessed the patient and staff exposures in cardiac procedures using the voxellized phantoms.•We determined the HT/KAP and E/KAP coefficients considering several dose-dependent parameters.•We ...evaluated the effectiveness of the mobile radiation protection cabin against routine equipment.•We demonstrated the efficiency of GEANT4 to estimate the effective and organ doses in IC procedure.
The aim of this study is to assess the radiation exposure of the patient and the medical staff during interventional cardiology procedures. Realistic exposure scenarios were developed using the adult reference anthropomorphic phantoms adopted by the International Commission on Radiological Protection (ICRP110Male and ICRP110Female), and the radiation transport code Geant4 (version 10.3). The calculated equivalent and effective doses were normalised by the simulated Kerma-Area Product (KAP), resulting in two conversion coefficients HT/KAP and E/KAP. To properly evaluate the risk of exposure, several dose-dependent parameters have been investigated, namely: radiological parameters (tube kilovoltage peak (kVp), type of projection, field size (FOV)), and operator positions. Four projections (AP,PA,LAO25° and RAO25°) were simulated for three X-ray energy spectra (80,100 and 120 kVp) with four different values of FOV (15×15 cm2,20×20 cm2,25×25 cm2 and 30×30 cm2). The results showed that the conversion coefficients values increase with increasing tube voltage as well as the FOV size. Recommended projection during the interventional cardiology procedures, whenever possible, should be the PA projection rather than AP projection. The most critical projection for the patient and the main operator is the RAO25° projection and the LAO25° projection respectively. The comparison of our results with the literature data showed good agreement allowing their use in the dosimetric characterization of interventional cardiology procedures.
In this work, we focus on the buildup correction of dose calculation using Haar wavelets in the Tunisian gamma irradiation facility. The buildup effect of gamma rays was used to adjust absorbed dose ...calculation for different depth in the irradiated products. A buildup study with different product densities was carried out to generalize the dose adjustment approach to any product at any depth.
•A buildup correction method of calculated dose using Haar wavelets is presented.•Corrected absorbed dose is calculated for lPropane and water.•Buildup factor fit as function of product density is performed.•Buildup factor fit is applied to diethyl ether and polypropylene.
Agriculture in India is highly sensitive to climatic variations particularly to rainfall and temperature; therefore, any change in rainfall and temperature will influence crop yields. An ...understanding of the spatial and temporal distribution and changing patterns in climatic variables is important for planning and management of natural resources. Time series analysis of climate data can be a very valuable tool to investigate its variability pattern and, maybe, even to predict short- and long-term changes in the series. In this study, the sub-divisional rainfall data of India during the period 1871 to 2016 has been investigated. One of the widely used powerful nonparametric techniques namely wavelet analysis was used to decompose and de-noise the series into time–frequency component in order to study the local as well as global variation over different scales and time epochs. On the decomposed series, autoregressive integrated moving average (ARIMA) and artificial neural network (ANN) models were applied and by means of inverse wavelet transform, the prediction of rainfall for different sub-divisions was obtained. To this end, empirical comparison was carried out toward forecast performance of the approaches namely Wavelet-ANN, Wavelet-ARIMA, and ARIMA. It is reported that Wavelet-ANN and Wavelet-ARIMA approach outperforms the usual ARIMA model for forecasting of rainfall for the data under consideration.
To study the variation of disposition kinetic values of sparfloxacin in healthy, hepatopathic, and nephropathic chickens after a single intravenous administration.
Hepatotoxicity was induced by the ...administration of paracetamol (500 mg / kg / day, p.o. for seven days) and nephrotoxicity by uranyl nitrate (2.0 mg / kg / day dissolved in distilled water, i.v. for four days) in chickens. Disposition kinetic studies of sparfloxacin were investigated in healthy as well as hepatopathic and nephropathic birds after a single intravenous administration at 40 mg / kg body weight.
Maximum plasma concentration detected at 0.16 hour was 31.25 +/- 2.95, 61.95 +/-1.85, and 99.86 +/- 2.21 mug / ml in healthy, hepatopathic, and nephropathic group, respectively. The drug could not be detected in the plasma of healthy birds beyond 12-hour period, while the same was detectable for 72 hour in the plasma of hepatopathic and nephropathic birds. The concentration of sparfloxacin was significantly (P < 0.01) higher in all the samples of hepathopathic and nephropathic birds compared to healthy birds. All the kinetic values were increased (P < 0.01) in the hepatopathic and nephropathic birds, except Vd(area) and Cl(B) values in hepatopathic Birds; while beta and Cl(B) values nephropathic birds were decreased significantly than that of healthy birds.
The dose of sparfloxacin may be reduced in hepatopathic as well as nephropathic birds.
In search of a suitable resource conservation technology under pigeonpea (Cajanus cajan L.)–wheat (Triticum aestivum L.) system in the Indo-Gangetic Plains, the effects of conservation agriculture ...(CA) on crop productivity and water-use efficiency (WUE) were evaluated during a 3-year study. The treatments were: conventional tillage (CT), zero tillage (ZT) with planting on permanent narrow beds (PNB), PNB with residue (PNB + R), ZT with planting on permanent broad beds (PBB) and PBB + R. The PBB + R plots had higher pigeonpea grain yield than the CT plots in all 3 years. However, wheat grain yields under all plots were similar in all years except for PBB + R plots in the second year, which had higher wheat yield than CT plots. The contrast analysis showed that pigeonpea grain yield of CA plots was significantly higher than CT plots in the first year. However, both pigeonpea and wheat grain yields during the last 2 years under CA and CT plots were similar. The PBB + R plots had higher system WUE than the CT plots in the second and third years. Plots under CA had significantly higher WUE and significantly lower water use than CT plots in these years. The PBB + R plots had higher WUE than PNB + R and PNB plots. Also, the PBB plots had higher WUE than PNB in the second and third years, despite similar water use. The interactions of bed width and residue management for all parameters in the second and third years were not significant. Those positive impacts under PBB + R plots over CT plots were perceived to be due to no tillage and significantly higher amount of estimated residue retention. Thus, both PBB and PBB + R technologies would be very useful under a pigeonpea–wheat cropping system in this region.
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