scholarly journals GEOLOGIC-FACTORS CONTROLLING TERRESTRIAL GAMMA-RAY DOSE RATES.

1972 ◽  
Author(s):  
H.A. Wollenberg ◽  
A.R. Smith
Keyword(s):  
Gamma Ray ◽  
Dose Rates

scholarly journals Modelling the bimodal distribution of indoor gamma-ray dose-rates in Great Britain

2018 ◽  
Vol 57 (4) ◽  
pp. 321-347 ◽  
Author(s):  
G. M. Kendall ◽  
P. Chernyavskiy ◽  
J. D. Appleton ◽  
J. C. H. Miles ◽  
R. Wakeford ◽  
...  
Keyword(s):  
Great Britain ◽  
Gamma Ray ◽  
Bimodal Distribution ◽  
Dose Rates

scholarly journals TL, OSL and C-14 dating results of the sediments and bricks from mummified nuns' grave

2012 ◽  
Vol 84 (2) ◽  
pp. 237-244 ◽  
Author(s):  
Diego R.G. Tudela ◽  
Sonia H. Tatumi ◽  
Márcio Yee ◽  
Silvio L.M. Brito ◽  
José L. Morais ◽  
...  
Keyword(s):  
Eighteenth Century ◽  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Gamma Ray ◽  
The State ◽  
Osl Dating ◽  
Annual Dose ◽  
Dose Rates ◽  
Gamma Ray Spectroscopy

This paper presents the results of TL and OSL dating of soil and fragments of bricks from a grave, which was occupied by two mummified nuns, found at "Luz" Monastery, located in the state of São Paulo, Brazil. The TL and OSL ages were compared to C-14 dating ones obtained from bone collagens of the mummies. The majority of the ages is related to the eighteenth century. The gamma-ray spectroscopy was used to evaluate natural radioisotope concentrations in the samples, and by using these concentrations the annual dose rates, from 3.0 to 5.3 Gy/kyr, were obtained. Neutron activation analysis was performed and the radioisotope contents results are in agreement with those obtained by gamma-ray spectroscopy. The contents of U, Th and Ce elements were higher than those found in usual sediments.

scholarly journals Induksi Mutasi Fisik dengan Iradiasi Sinar Gamma pada Kunyit (Curcuma domestica Val.)

2015 ◽  
Vol 5 (2) ◽  
pp. 84
Author(s):  
Yahidah Rosyidah Anshori ◽  
Syarifah Iis Aisyah ◽  
Latifah K Darusman
Keyword(s):  
Gamma Ray ◽  
Morphological Changes ◽  
Stunted Growth ◽  
Dose Rates ◽  
Yellow Color ◽  
Vegetative Traits ◽  
Gamma Ray Irradiation ◽  
Leaf Deformation ◽  
Rheumatic Heart

<p>ABSTRACT</p><p>Turmeric  is  a  spice plant  and  potential  as a major  ingredient  of  functional food. Turmeric contains curcumin, an active compound which gives the yellow color from its rhizomes that provides health benefits. Curcumin is an antioxidant and acts as an anti-cholesterol as well as a medicine for tumors, cancer, hypertension, hyperglycemia, and rheumatic heart disease. Limited supply of simplicialevel of curcumin based on market standards and the low genetic variability of turmeric as a source for conventional breeding makes this research valuable to be  conducted.  The purposes of this study were  to  obtain  LD50 dose  and  turmeric  crop  yield  variability  due  to  the  changes  in physical mutation  induced  by  gamma-ray  irradiation.  An  acute  single iradiation  was  given  to  using  the universal panoramic irradiator with 11 different dose rates,  The plants  then were cultivated in vivo. The  growth observation  on  turmeric  was  observed  on  vegetative  traits  qualitatively and quantitatively. In this study, the LD50 dose of turmeric was 47.26 Gy. The plant’s vegetative growth tends  to  decelerate  with  the  increase  of irradiation  doses.  The  high  variabillity  growth  for   leaf number  occured  on 50  Gy  of  dose.  Morphological  changes  occured  in  the  form  of  pseudo-stem shape  due  to  irradiation  doses  of  50  and  60  Gy.  Most  leaf  surface discoloration  and  leaf deformation occured at 50 and 70 Gy, and stunted growth occured at 60 and 70 Gy.</p><p>Keywords: curcumin, iradiation, LD50, turmeric</p><p> </p><p>ABSTRAK</p><p>Kunyit merupakan tanaman rempah yang potensial sebagai bahan utama pangan fungsional. Rimpang kunyit mengandung senyawa aktif utama yaitu kurkumin yang memberikan warna kuning pada  rimpang  juga  memberikan manfaat  untuk  kesehatan.  Kurkumin  bersifat  antioksidan  dan berperan sebagai  antikolesterol,  obat  tumor,  kanker,  obat  hipertensi,  hiperglikemia, penyakit  hati serta  rematik.  Keterbatasan  penyediaan  simplisia  yang mempunyai  kandungan  kurkumin  sesuai standar  pasar  serta  rendahnya keragaman  genetik  kunyit  sebagai  bahan  seleksi  pemuliaan konvensional menjadikan penelitian ini penting untuk dilakukan. Tujuan penelitian ini adalah untuk mendapatkan  dosis  LD50  serta  menghasilkan  perubahan  keragaan tanaman  kunyit  akibat  induksi mutasi  fisik  melalui  iradiasi  sinar  gamma. Iradiasi  dilakukan  secara  tunggal  (acute  irradiation) menggunakan Iradiator Panorama Serba Guna (IRPASENA) dengan 11 taraf dosis yang berbeda dan tanaman  yang  telah  diradiasi  dibudidayakan  secara  in  vivo. Pengamatan  pertumbuhan  tanaman kunyit  dilakukan  pada  karakter vegetatif secara  kuantitatif  dan  kualitatif.  Pada  penelitian  ini, didapatkan  LD50 kunyit  yaitu  pada  dosis  47.26  Gy.  Pertumbuhan  vegetatif  tanaman cenderung mengalami  perlambatan  dengan  semakin  meningkatnya  dosis iradiasi.  Keragaman  tertinggi pertumbuhan jumlah daun terdapat pada aplikasi dosis 50 Gy. Perubahan morfologi berupa bentuk pangkal  batang  semu  terjadi pada  tanaman  akibat  iradiasi  dosis  50  dan  60  Gy,  perubahan warna sebagian permukaan daun dan terjadi pada 50 dan 70 Gy, perubahan bentuk daun terjadi pada 50 dan 70 Gy, serta pertumbuhan tanaman yang kerdil terjadi pada tanaman 60 dan 70 Gy.</p><p>Kata kunci: iradiasi, kunyit, kurkumin, LD50</p>

Seasonal and spatial variations of enhanced gamma ray dose rates derived from 222Rn progeny during precipitation in Japan

2007 ◽  
Vol 41 (37) ◽  
pp. 8043-8057 ◽  
Author(s):  
Y. Inomata ◽  
M. Chiba ◽  
Y. Igarashi ◽  
M. Aoyama ◽  
K. Hirose
Keyword(s):  
Gamma Ray ◽  
Spatial Variations ◽  
Dose Rates ◽  
Seasonal And Spatial Variations

Development of New Simulation Software System to Evaluate Radiation Dose Rates in a Wide Radioactively Contaminated Area

2012 ◽  
Author(s):  
Tomoharu Hashimoto ◽  
Masahiro Kondo ◽  
Ryuichi Tayama ◽  
Hideho Gamo
Keyword(s):  
Radiation Dose ◽  
Dose Rate ◽  
Gamma Ray ◽  
Simulation Software ◽  
Radiation Dose Rate ◽  
Dose Rates ◽  
Reduce Radiation Exposure ◽  
Radiation Sources ◽  
Reduction Effect ◽  
Contaminated Area

The Japanese government plans to conduct decontamination tasks in radioactively contaminated areas. For such a situation, we developed a system that evaluates radiation dose rates in a wide radioactively contaminated area by utilizing our radiation dose evaluation technology. This system can not only generate present maps of radiation dose rate in the air based on the dose rate measured at the surface of the contaminated areas, but can also quickly calculate the reduction effect of dose rate due to decontamination tasks by entering decontamination factors. The system can then formulate decontamination plans and make it possible to plan measures to reduce radiation exposure for workers and local residents. Radioactive nuclides that contribute to gamma-ray dose rate are mainly Cs-134 and Cs-137 in soil, on trees, buildings, and elsewhere. Shapes of such radiation sources are assumed to be 10m square or 100m square. If it is unsuitable that the radiation sources assume to squares, the radiation sources can assume to point. The relation between distance from the surface or point source and the radiation dose rate is calculated using MCNP5 code (A General Monte Carlo N-Particle Transport Code - Version 5), and approximated using four-parameter empirical formula proposed by Harima et al. In addition, the system can consider shielding such as soil, concrete, and iron. When setting such shielding, the skyshine dose rate is taken into account in dose rate calculation.

GAMMA DOSE RATES IN THE HIGH BACKGROUND RADIATION AREA OF MANGALORE REGION, INDIA

2019 ◽  
Vol 184 (3-4) ◽  
pp. 290-293 ◽  
Author(s):  
Darwish Al-Azmi ◽  
Sudeep Kumara ◽  
M P Mohan ◽  
N Karunakara
Keyword(s):  
Gamma Ray ◽  
Background Radiation ◽  
Gamma Dose ◽  
Natural Background ◽  
High Background ◽  
Natural Background Radiation ◽  
Dose Rates ◽  
Gamma Dose Rates ◽  
High Background Radiation Area ◽  
Normal Background

Abstract Elevated levels of natural background radiation due to scattered patches of monazite sand around the beaches of Mangalore, India, have been reported earlier. A comparative study of gamma dose rates was performed in both normal background and high natural background radiation areas around Mangalore using different types of portable gamma dosimeters. In addition to this, gamma-ray energy spectra were acquired, in situ, using a NaI(Tl) based portable gamma spectrometer. Soil and sand samples were collected for laboratory analysis with HPGe detectors. Measurements were carried out during the years 2016–18 revealed that in majority of the locations the gamma dose rates were similar to the normal background regions, whereas, in certain locations the dose rates were higher with values up to 530 nSv/h.

scholarly journals Microbial radiosensitization using combined treatments of essential oils and irradiation- part B: Comparison between gamma-ray and X-ray at different dose rates

2020 ◽  
Vol 143 ◽  
pp. 104118
Author(s):  
Shiv Shankar ◽  
Peter Follett ◽  
Samia Ayari ◽  
Farah Hossain ◽  
Stephane Salmieri ◽  
...  
Keyword(s):  
Essential Oils ◽  
Gamma Ray ◽  
Combined Treatments ◽  
X Ray ◽  
Dose Rates

scholarly journals Dose Rates Produced from Gamma Ray Sources

1957 ◽  
Vol 49 (7) ◽  
pp. 1197-1202
Author(s):  
J. G. Lewis
Keyword(s):  
Gamma Ray ◽  
Dose Rates

Return period of enhanced gamma ray dose rates: regional differences observed in Japan

2008 ◽  
Vol 10 (7) ◽  
pp. 837
Author(s):  
Yayoi Inomata ◽  
Yasuhito Igarashi ◽  
Masaru Chiba ◽  
Michio Aoyama ◽  
Katsumi Hirose
Keyword(s):  
Return Period ◽  
Regional Differences ◽  
Gamma Ray ◽  
Dose Rates
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