Effects of fast neutron and gamma irradiation on electrical conductivity of some borate glasses

2002 ◽  
Vol 303 (1) ◽  
pp. 44-51 ◽  
Author(s):  
N.A. Elalaily ◽  
R.M. Mahamed
2021 ◽  
Vol 11 (15) ◽  
pp. 6837
Author(s):  
Ghada ALMisned ◽  
Huseyin O. Tekin ◽  
Esra Kavaz ◽  
Ghaida Bilal ◽  
Shams A.M. Issa ◽  
...  

The purpose of this research was to investigate the shielding characteristics of high-amount heavy metal oxide and Eu3+-activated borate glasses based on 10La2O3–50HMO–(40–x) B2O3–xEu2O3 (x = 0, 0.5, 1, 2, and HMO = PbO, Bi2O3). Critical gamma radiation attenuation characteristics, particularly mass attenuation coefficients of investigated heavy metal oxide glass samples, were determined using Monte Carlo simulations and the Phy-x/PSD software. Following that, we looked at the half-value layer, mean free path, effective atomic number, and build-up factors across a broad energy range (0.015–15 MeV). According to the study’s results, the addition of Eu2O3 enhanced the mass attenuation coefficient and effective atomic number, while reducing the half-value layer, mean free path, and accumulation factors. In terms of gamma radiation attenuation, the LBi50BEu glass system surpassed the LPb50BEu glass system in terms of overall shielding properties against nuclear radiation. Additionally, the heavy metal oxide glass’ efficacy as a neutron shield was determined using fast neutron removal cross-sections (ΣR). LBi50BEu2 glass was shown to be more effective in preventing the penetration of charged particle radiation.


1981 ◽  
Vol 54 (4) ◽  
pp. 461-467 ◽  
Author(s):  
Alexander M. Spence ◽  
Joseph P. Geraci

✓ The combination of cyclotron fast-neutron radiotherapy with BCNU chemotherapy was compared to 137Cs gamma photon radiotherapy combined with BCNU in the 36B-10, F-344 rat-transplanted glioma model. Radiation and drug treatments were administered 7 to 8 days after intracerebral tumor implantation. Increase in animal survival time was used as the measure of the effectiveness of various treatment schedules. Single-dose neutron or gamma radiotherapy was tested on Day 7 over the ranges 0 to 900 rads and 0 to 2000 rads, respectively. This therapy produced increases in mean survival times up to 70% at the highest radiation doses. When BCNU (10 mg/kg body weight) was administered intravenously on Day 8, 1 day following radiotherapy, mean survival times were increased by an additional 35% to 50%, irrespective of the dose or type of irradiation. In contrast, by using the same radiation and drug doses but scheduling combined therapy trials so that BCNU was administered 1 hour before either neutron or gamma irradiation on Day 7, there was enhancement of the radiation effect by BCNU. Under these conditions, the maximum enhancement of the mean survival time was 70% to 75% in neutron-treated animals and 120% to 150% in gamma-treated animals. Treatment with BCNU 1 hour before or 1 day after neutron irradiation proved to be no more effective in improving the survival time of tumor-bearing animals than the drug similarly combined with conventional gamma irradiation.


1983 ◽  
Vol 47 (2) ◽  
pp. 201-209
Author(s):  
Morsi M. Morsi ◽  
E.M.H. Ibrahim ◽  
A.M. Nassar

2020 ◽  
Vol 22 ◽  
pp. 2103-2108
Author(s):  
D. Vijayatha ◽  
N. Sivasankara Reddy ◽  
C. Narayana Reddy

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