Gamma rays in range

A prototype LaBr3 detector system with an integrated electronics unit was developed to perform accurate gamma ray spectroscopy in harsh environments. A simple spectral shift methodology was employed in a LaBr3 detector system, which is capable of restoring gamma spectra measured under various temperature conditions within the range of − 20 to +50 ◦C, in real-time.

10p vironald 15-12-2022 4 3   Download

In this study, hard wood cuttings of Hibiscus rosa-sinenis Cultivar Red Single were treated with nine different dose of gamma rays (1 to 5 k R) and ten different concentrations of EMS ranging from 0.1% to 1.0%. The results revealed that gradual reduction in survival of cuttings, shoot length, leaf length and leaf width with increase in dosage of gamma rays and EMS. However gamma rays treated plants showed significant gradual reduction in growth rate than the EMS treated plants. Based on probit analysis, LD50 (Lethal dose) value for gamma radiation and EMS have been fixed as 2.81 kR and 0.

8p chauchaungayxua10 19-03-2021 16 2   Download

The present paper describes a simple and automatic procedure for the determination of the relative efficiency using one or more activation products emitting gamma rays over a considered range of the spectrum. The procedure can be applied for INAA and PGNAA analysis.

7p trinhthamhodang1218 14-03-2021 10 1   Download

This study performs an integrated method using thin section and well log data to determine rock fabrics and their relationship with the rock pore system in Miocene carbonate reservoirs of well RR02, southern Song Hong basin, Vietnam. By thin section analysis, mineral components and pore types of carbonate rocks were determined, creating a basis for carbonate classification and grouping samples into different petrophysical classes.

8p kequaidan6 10-07-2020 20 0   Download

In the present studies treated the seeds using gamma rays different does 10 kR to 100 kR each treatment using 50 seeds. The percentage of seed germination ranges from 0 per cent to 52 per cent with different does of gamma rays in butter bean variety KKL-1 as compared to 86 per cent control. The different in seed germination are statistically significant. The LD50 value was found at 10 kR for seed germination. The percentage of survival was 81 per cent in control while it are significant range from 0 per cent 100 kR to 48 per cent 10 kR of gamma rays in butter bean variety KKL-1.

6p chauchaungayxua6 26-06-2020 14 0   Download

The present investigation was conducted during the Kharif season of 2013, seeds of black gram [Vingo mungo (L.) Hepper] variety VBN 4 and ACM 07002 were exposed to gamma rays doses at 200, 250, 300 and 350 Gy and EMS (Ethyl Methane Sulphonate) doses at 20, 30 and 40 mM. Wide ranges of viable mutants were isolated in M2 and M3 generation. The mutational change in each quantitative trait can be large or small.

4p nguathienthan4 18-04-2020 14 1   Download

Mutagenic effectiveness and efficiency of gamma rays were studied in three genotypes of Indian mustard (two local cultivars and one improved variety). From the present study, it was suggested that the LD50 ranging from 1000 Gy (pollen sterility) to 1200 Gy or above (survival reduction) may be used for gamma ray treatment in Indian mustard. Five types of chlorophyll mutants were observed in the order of Albina> Chlorina=Viridis> Xantha=Alboviridis. The highest mutation frequency was recorded from 1000 Gy gamma ray treatment which was followed by 1200 Gy.

11p quenchua4 06-04-2020 10 3   Download

Gamma radiation is the most commonly used mutagen in plants as it causes a high frequency of induced mutations. It can be used to overcome the difficulties in papaya breeding to get true to type plantlets especially in dioecious varieties. An optimum dose is highly desired to produce the high frequency of mutations with minimum killing of treated individuals. Therefore, the present investigation was undertaken to determine the LD50 of gamma rays and effect of different dosages of gamma rays on morphological, physiochemical, biochemical parameters of papaya.

13p caygaocaolon2 11-03-2020 21 1   Download

The aim of the present study was extended from obtaining information about the interaction of gamma rays with Makrofol DE 7-2 track detector to introduce the basis that can be used in concerning simple sensor for gamma irradiation and bio-engineering applications. Makrofol polymer samples were irradiated with 1.25 MeV 60Co gamma radiations at doses ranging from 20 to 1000 kG y. The modifications of irradiated samples so induced were analyzed using UV–vis spectrometry, photoluminescence spectroscopy, and the measurements of Vickers’ hardness.

6p trinhthamhodang1 16-11-2019 14 1   Download

In this study, aerosol samples at Hanoi, Vietnam from February 2017 to January 2018 collected on the glass fiber filter were analyzed for 210Pb by using HPGe spectrometry. 210Pb weekly activity concentrations were in the range of 0.12 mBq.m-3 to 2.87 mBq.m-3 with an average value of 0.92 mBq.m-3 and 210Pb monthly activity concentrations were in the range of 0.99 mBq.m-3 to 9.24 mBq.m-3 with an average value of 4.01 mBq.m-3.

6p vineptune2711 04-11-2019 11 0   Download

In this work, we determine the linear attenuation coefficients of different samples by using the HPGe detector with the gamma rays in the energy range from 81.0 keV to 1764.5 keV emitted from point sources, including 133 Ba, 226Ra, and their progenies, 214Pb, 214Bi. The results show that the linear relationship between energy to the densities of the samples. This investigation aims at establishing a database for further studies.

7p nguaconbaynhay 20-10-2019 14 0   Download

In this study, an improved algorithm for n/g discrimination using a parameter, which is the ratio of the rise time to the pulse height, is proposed. The n/g discrimination performance of the algorithm is evaluated by applying it to 252Cf neutron signal separation from various gamma-ray exposure rate levels ranging 0.1e5 R/h. The performance is compared to that of the conventional pulse-height analysis method in terms of the gamma elimination ratio.

6p minhxaminhyeu3 12-06-2019 15 0   Download

In this study, an in-house 152Eu calibration source was produced from a custom epoxy matrix with a density of r ¼ 1.14 g cm3 , which is chemically stable and durable form after its solidification. The homogeneity of 152Eu in matrix was obtained better than 98%. For a Marinelli beaker geometry, an efficiency calibration procedure was applied to a n-type, coaxial, 78.5% relative efficient HPGe detector in the energy range of 121.7e1408.0 keV by using in-house 152Eu calibration source.

7p minhxaminhyeu3 12-06-2019 16 0   Download

In the present work, we determined the gamma-ray attenuation characteristics of eight different polymers(Polyamide (Nylon 6) (PA-6), polyacrylonitrile (PAN), polyvinylidenechloride (PVDC), polyaniline (PANI), polyethyleneterephthalate (PET), polyphenylenesulfide (PPS), polypyrrole (PPy) and polytetrafluoroethylene (PTFE)) using transmission geometry utilizing the high resolution HPGe detector and different radioactive sources in the energy range 81e1333 keV.

7p minhxaminhyeu3 12-06-2019 16 1   Download

The effective reduction of background (1.04) by the copper mainly appeared in the energy range from X-ray up to 500 KeV, while for the total energy range the ratio is 1.01 relative to the lead only. In addition, a strong relation between the full-energy peak absolute efficiency and the detector well height was found using gamma-ray isotropic radiation point sources placed inside the detector well. The full-energy peak efficiency at a midpoint of the well (at 2.5 cm) is three times greater than that on the detector surface.

8p minhxaminhyeu3 25-06-2019 17 1   Download

An extensive investigation of photon interaction properties has been made for ZnxTe100-x alloys (where x ¼ 5, 20, 30, 40, 50) to explore its possible use in sensing and shielding gamma radiations. The results show better and stable response of ZnTe alloys for various photon interaction properties over the wide energy range, with an additional benefit of ease in fabrication due to lower melting points of Zn and Te. Mass attenuation coefficient values show strong dependence on photon energy as well as composition.

8p minhxaminhyeu3 25-06-2019 22 0   Download