Ageing studies of Multi-Strip Multi-Gap Resistive Plate Counters based on low resistivity glass electrodes in high irradiation dose

The aim of this work was to compare and discuss the influence of multifunctional monomers as crosslinking agent (Triallyl Isocyanurate; TAIC) and chain extender (Joncryl ADR4368) on the gamma irradiated Polylactic acid (PLA). The modified PLA samples with varying amount of TAIC and Joncryl were characterized by observing the molecular characteristics and mechanical properties. The results showed that irradiated PLA had lower average molar mass and mechanical properties compared to non-irradiated PLA due to irradiation induced chain scission. Gel content was observed and increased with increasing irradiation dose for the TAIC modified sample, indicating that the further crosslink of irradiated PLA was occurring. Crosslinking and chain extension were responsible for the improved modulus and tensile strength of irradiated PLA, however the decrease in tensile strength at high irradiation dose was observed for crosslinked PLA.

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Resistance to irradiation of micro-algae growing in the storage pools of a nuclear reactor investigated by NMR and neutron spectroscopies

Spectroscopy An International Journal ◽

10.1155/2010/592156 ◽

2010 ◽

Vol 24 (3-4) ◽

pp. 381-385 ◽

Cited By ~ 2

Author(s):

Corinne Rivasseau ◽

Emmanuel Farhi ◽

Marina Gromova ◽

Jacques Ollivier ◽

Richard Bligny

Keyword(s):

Nuclear Magnetic Resonance ◽

Amino Acid ◽

Magnetic Resonance ◽

Irradiation Dose ◽

Nuclear Reactor ◽

Protein Repair ◽

Repair Activity ◽

Organic Acid Content ◽

High Irradiation ◽

Storage Pools

A green Chlorophycean micro-alga surviving high irradiation doses has been discovered in the storage pools of a nuclear reactor. Investigating the mechanisms sustaining its properties is of peculiar interest. Metabolic impact of irradiation on the micro-alga as well as structural macromolecular impact were investigated using nuclear magnetic resonance and neutron backscattering spectroscopy. Carbohydrate, amino acid and organic acid content studied as a function of the irradiation dose revealed an intense protein repair activity. Resilience was extracted according to irradiation dose and compared to that of other extremophile species.

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Outcomes of chemoradiotherapy with a high irradiation dose using a 3D radiation treatment planning system for esophageal cancer.

Journal of Clinical Oncology ◽

10.1200/jco.2011.29.4_suppl.89 ◽

2011 ◽

Vol 29 (4_suppl) ◽

pp. 89-89

Author(s):

Y. Murakami ◽

Y. Nagata ◽

I. Nishibuchi ◽

T. Kimura ◽

M. Kenjo ◽

...

Keyword(s):

Esophageal Cancer ◽

Treatment Planning ◽

Irradiation Dose ◽

Radiation Treatment ◽

Survival Rates ◽

Planning System ◽

Treatment Planning System ◽

Radiation Treatment Planning ◽

High Irradiation Dose ◽

Radiation Treatment Planning System

89 Background: The standard irradiation dose of chemoradiotherapy (CRT) for esophageal cancer is 50.4 Gy, however, the trials in which this standard dose was originated were based on 2D radiation treatment planning. In this study we assessed the survival and toxicities of CRT with a dose of 60-66 Gy using a 3D radiation treatment planning system (3DRTPS) for esophageal cancer. Methods: One hundred and two eligible patients with esophageal cancer treated by definitive CRT between 2000 and 2006 were assessed. Median age was 67 years old. There were stage I in 22 patients, stage II-III (without T4) in 27 and T4/M1Lymph legions in 53. There were 100 patients with squamous cell carcinoma histology and 2 with small cell carcinoma. Main tumor sites were cervical/upper/middle/lower thoracic in 15/19/43/25 patients. Treatment planning of irradiation was performed using a CT based 3DRTPS. Total irradiation dose of our protocol was 60-66 Gy. Accomplishment rate of planned irradiation was 93%. All patients received chemotherapy concurrently with radiotherapy. Fluorouracil based chemotherapy was performed in 96 patients (94%). Results: The data was updated in August 2010. The median follow-up was 67 months. Cause-specific survival rates at 5 years for stage I, II-III (without T4) and T4/M1lymph were 100%, 49% and 17%, respectively and overall survival rates were 66%, 35% and 13%, respectively. Complete response (CR) rates were 100%, 79% and 35%, respectively and failure rates of CR cases were 5%, 43% and 42%, respectively. Late adverse effects (≥ grade 3) were observed in 11 patients (10%); pneumonitis in 4 (4%), pleural effusion in 4 (4%) and pericardial effusion in 5 (5%). Treatment related deaths were observed in 2 cases (pneumonitis developed during treatment in 1 and debility due to treatment in 1). Conclusions: Toxicities of CRT with a high irradiation dose using 3DRTPS for esophageal cancer were acceptable and survival was promising. Dose intensification study of 50.4 Gy versus ≥ 60 Gy in CRT using a 3D-conformal radiation therapy technique for esophageal cancer should be considered. No significant financial relationships to disclose.

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Utilization of Acetyl Salicylic Acidand Irradiation as Postharvest Treatments for Storage of Persimmon Fruits Cv."Costata"

Asian Journal of Agricultural and Horticultural Research ◽

10.9734/ajahr/2019/v3i329998 ◽

2019 ◽

pp. 1-10

Author(s):

E. Azza Al-Majed ◽

M. S. El-Shamma ◽

M. Omaima Hafez ◽

A. Malaka Saleh ◽

S. Nagwa Zaied

Keyword(s):

Shelf Life ◽

Fruit Quality ◽

Room Temperature ◽

Radiation Treatment ◽

Quality Parameters ◽

Co60 Source ◽

Close Relationship ◽

High Irradiation Dose ◽

Β Carotene ◽

High Irradiation

Mature Persimmon fruits "Costata cv." were used to study the effect of Acetyl Salicylic Acid (ASA) at rates 0, 2, 3% and/or irradiation (IRD) with 0.0, 1.0, 2.0 KGy doses, using CO60 source at 2g /Sec as a trial for prolonging fruit marketing period and extending its shelf life with good quality, after cold storage treatment. Nine treatments including control were stored for 75 days at 0 ± 1oC with 80 + 2% relative humidity to measure weight loss, fruit firmness and decay percentages. Where, fruit quality parameters during shelf life were evaluated after 7 days of transference to room temperature (23 ± 2°C). Results showed a close relationship between high irradiation dose (2 KGy) and rate of detrimental effects by accelerating ripening process and softening during storage and shelf life to obtain less marketing fruits. Adding ASA at either 3 or 2% to fruits irradiated with2 KGy, slightly reduced the decline in fruit quality. Furthermore, non-treated cold stored fruits dominated 2 KGy treatment, in this respect.However, fruit constituent values were gradually progressed and 1 KGy dose recorded the highest storability effect in keeping fruits firm with less deterioration response as combined with 2% ASA, compared with sole ones.Moreover, improving effect in fruit components i.e., acidity, VC, SSC, sugar, T. flavonoids, β-Carotene and reduction in tannin contents were retained with 1 KGy treatment as combined with 2% ASA followed in descending order by 3% ASA. In general, irradiation of persimmon fruits at dose (2 KGy) was not suitablefor preserving stored fruits. Also, sole radiation treatment at 1 KGy was less effective than sole treatment of ASA at either 2 or 3% rates, in this respect. Therefore, irradiation with 1 KGy combined with ASA treatment at 2% can be recommended for improving storability of persimmon"Costata cv." fruits with the maintenance of good marketable and preferable nutritional parameters up to extended shelf life.

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VERY LOW RESISTIVITY AuMn GATE OHMIC CONTACTS FOR GaInAs DIFFUSED JFETs

Le Journal de Physique Colloques ◽

10.1051/jphyscol:1988496 ◽

1988 ◽

Vol 49 (C4) ◽

pp. C4-453-C4-456 ◽

Cited By ~ 3

Author(s):

P. E. HALLALI ◽

P. BLANCONNIER ◽

L. BRICARD ◽

J-C. RENAUD

Keyword(s):

Ohmic Contacts ◽

Low Resistivity

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Radioimmunotherapy of Xenografts of Human Pancreatic Carcinomas - Intravenous and Intratumoral Application of 131l-Labelled Monoclonal Antibodies

Nuklearmedizin ◽

10.1055/s-0038-1624350 ◽

1986 ◽

Vol 25 (06) ◽

pp. 235-238 ◽

Cited By ~ 1

Author(s):

S. Lander ◽

M. Bahlo ◽

R. Montz ◽

R. Klapdor

Keyword(s):

Irradiation Dose ◽

Tumor Regression ◽

Whole Body ◽

Inhibit Tumor Growth ◽

Local Irradiation ◽

Clinical Value ◽

Direct Radiation ◽

Intravenous Injections ◽

Induce Tumor Regression ◽

High Doses

The effects of radioimmunotherapy were tested in xenografts of 2 different human pancreatic carcinomas comparing the intravenous and intratumoral application. On principle, intravenous injections of high doses of 131l-anti- Ca 19-9 or -BW 494/32 may inhibit tumor growth. In view of the low direct radiation dose (360-2100 rad), however, other factors than direct toxic effects have to be discussed, e. g. systemic effects due to the high whole-body irradiation. Intratumoral application, however, may induce tumor regression or growth inhibition due to the high local irradiation dose. Consequently, this treatment modality might be of clinical value at least in some patients.

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Integration of Multi-geophysical Approaches to Identify Potential Pathways of Heavy Metals Contamination - A Case Study in Zeida, Morocco

Journal of Environmental and Engineering Geophysics ◽

10.32389/jeeg9-067 ◽

2020 ◽

Vol 25 (3) ◽

pp. 415-423

Author(s):

Ahmed Lachhab ◽

El Mehdi Benyassine ◽

Mohamed Rouai ◽

Abdelilah Dekayir ◽

Jean C. Parisot ◽

...

Keyword(s):

Heavy Metals ◽

Seismic Velocity ◽

Seismic Refraction ◽

Geophysical Methods ◽

Low Frequency ◽

Electrical Current ◽

P Wave ◽

Low Resistivity ◽

Refraction Tomography ◽

Geophysical Surveys

The tailings of Zeida's abandoned mine are found near the city of Midelt, in the middle of the high Moulouya watershed between the Middle and the High Atlas of Morocco. The tailings occupy an area of about 100 ha and are stored either in large mining pit lakes with clay-marl substratum or directly on a heavily fractured granite bedrock. The high contents of lead and arsenic in these tailings have transformed them into sources of pollution that disperse by wind, runoff, and seepage to the aquifer through faults and fractures. In this work, the main goal is to identify the pathways of contaminated water with heavy metals and arsenic to the local aquifers, water ponds, and Moulouya River. For this reason, geophysical surveys including electrical resistivity tomography (ERT), seismic refraction tomography (SRT) and very low-frequency electromagnetic (VLF-EM) methods were carried out over the tailings, and directly on the substratum outside the tailings. The result obtained from combining these methods has shown that pollutants were funneled through fractures, faults, and subsurface paleochannels and contaminated the hydrological system connecting groundwater, ponds, and the river. The ERT profiles have successfully shown the location of fractures, some of which extend throughout the upper formation to depths reaching the granite. The ERT was not successful in identifying fractures directly beneath the tailings due to their low resistivity which inhibits electrical current from propagating deeper. The seismic refraction surveys have provided valuable details on the local geology, and clearly identified the thickness of the tailings and explicitly marked the boundary between the Triassic formation and the granite. It also aided in the identification of paleochannels. The tailings materials were easily identified by both their low resistivity and low P-wave velocity values. Also, both resistivity and seismic velocity values rapidly increased beneath the tailings due to the compaction of the material and lack of moisture and have proven to be effective in identifying the upper limit of the granite. Faults were found to lie along the bottom of paleochannels, which suggest that the locations of these channels were caused by these same faults. The VLF-EM surveys have shown tilt angle anomalies over fractured areas which were also evinced by low resistivity area in ERT profiles. Finally, this study showed that the three geophysical methods were complementary and in good agreement in revealing the pathways of contamination from the tailings to the local aquifer, nearby ponds and Moulouya River.

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