Comparison between fast neutron and gamma irradiation of optical fibres

1998 ◽  
Vol 45 (3) ◽  
pp. 1543-1551 ◽  
Author(s):  
H. Henschel ◽  
O. Kohn ◽  
W. Lennartz ◽  
S. Metzger ◽  
H.U. Schmidt ◽  
...  
Keyword(s):  
Gamma Irradiation ◽  
Fast Neutron ◽  
Optical Fibres

Combined cyclotron fast-neutron and BCNU therapy in a rat brain-tumor model

1981 ◽  
Vol 54 (4) ◽  
pp. 461-467 ◽  
Author(s):  
Alexander M. Spence ◽  
Joseph P. Geraci
Keyword(s):  
Gamma Irradiation ◽  
Survival Time ◽  
Fast Neutron ◽  
Combined Therapy ◽  
Tumor Model ◽  
Survival Times ◽  
Gamma Photon ◽  
Maximum Enhancement ◽  
Content Type ◽  
Fine Print

✓ 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.

The effect of fast neutron and gamma irradiation on thermal, structural and colorant properties of 2,6-diaminopyridine

2010 ◽  
Vol 68 (10) ◽  
pp. 1884-1891 ◽  
Author(s):  
Hassangholi Mohammadi ◽  
Ali Hassanzadeh ◽  
Rasol Khodabakhsh
Keyword(s):  
Gamma Irradiation ◽  
Fast Neutron

scholarly journals Effects of Benzyladenine on in vitro ‘Hom Rangsi’ Rice and Induction of Aluminum Acid Tolerance Lines by Gamma Irradiation

2021 ◽  
Vol 20 (2) ◽  
Author(s):  
Vichai Puripunyavanich ◽  
Vararas Khamvarn ◽  
Somjai Ngamjob
Keyword(s):  
Gamma Irradiation ◽  
Fast Neutron ◽  
Gamma Ray ◽  
Solid Medium ◽  
Acid Tolerance ◽  
Neutron Radiation ◽  
Multiple Shoot ◽  
Shoot Induction ◽  
Multiple Shoot Induction

‘Hom Rangsi’ was the non-photoperiod aromatic mutant rice which derived from fast neutron radiation KDML 105. ‘Hom Rangsi’ seeds were cultured on MS solid medium without any supplemented for a week. And then, all explants were placed on MS (Murashige and Skoog, 1962) medium supplemented with 0, 5, 10, 15, 20, 25 mg/L BA (benzyladenine) for multiple shoot induction. The optimal concentration of BA for induced multiple shoot induction of ‘Hom Rangsi’ line was MS + BA 25 mg/L, the highest number of shoots were 5.38 shoot/seed. The following experiment was done, irradiated ‘Hom Rangsi’ seeds with 0, 100, 200, 300, 400 Gy gamma ray which cultured on MS solid medium supplemented with 400 mg/L Al3+ pH 2.9 were selected for acid tolerance lines. After six weeks cultured, the survivals of irradiated plantlets were 86.32, 77.78, 58.95, 58.95, 21.87% and the height of irradiated plantlets were 8.4, 8.3, 6.7, 6.6, 6.1 cm respectively without any shoot budding. All survival plantlets were transferred to suitable MS + BA 25 mg/L medium which discovered from the first experiment for multiple shoot budding. After six weeks cultured, the maximum of 5.24 shoots/plantlet were found from 300 Gy irradiation significantly and followed by 400, 200, 0 and 100 Gy irradiation treatments which gave 4.55 and 4.41, 4.37 and 4.31 shoots/planlet respectively.

scholarly journals Gamma irradiation effects in optical fibres, splitters, and connectors

2017 ◽  
Vol 32 (4) ◽  
pp. 375-380
Author(s):  
Milesa Sreckovic ◽  
Sladjana Pantelic ◽  
Srboljub Stankovic ◽  
Suzana Polic ◽  
Nenad Ivanovic ◽  
...  
Keyword(s):  
Laser Beam ◽  
Gamma Irradiation ◽  
Experimental Results ◽  
Optical Fibres ◽  
Signal Attenuation ◽  
Irradiation Effects ◽  
Dose Rates ◽  
Irradiation Geometry ◽  
Definition Of ◽  
Exact Definition

The paper presents a brief overview of contemporary ELION techniques with stress on their use for material modification and dosimetry. In the attempt to avoid some common misjudges of irradiation effects, special attention is paid to exact definition of irradiation geometry and careful adjustment of dose rates, which enable a proper elaboration of experimental results. In particular, effects of g-rays irradiation on properties of commercial optical fibres, splitters, connectors, and fibre joints are examined, which enables monitoring of irradiation effects in complex configurations made of materials with different radiation hardness (resistance). It has been established that g-rays irradiation of the investigated elements influences, in different ways, the transmission of laser beam signals of various wavelengths, under different modulation regimes. After irradiation, the signal attenuation is noticeably larger, both in optical connectors and optical splitter, than before it, and the effect increases in time. The effects are more pronounced at the 99 % than at the 1 % Y-splitter output at both measured wavelengths, and are more pronounced at 1310 nm than at 1550 nm.

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