Development of the Hydrogeological Survey Method Using the Natural Dissolved Noble Gases for the Site-Characterization for Radwastes Disposal

1994 ◽  
Vol 353 ◽  
Author(s):  
Yasunori Mahara

AbstractThis study focused on developing the tracer method using the dissolved natural noble gases. The method measures precisely helium and neon dissolved in groundwater for dating. Since the dissolved helium consists of three different components (Atmospheric He, Radiogenic He and Mantle He), if it is possible to separate total dissolved helium into each component, the mixing rate between young groundwater and ancient will be predicted in in-situ groundwater. Then, dating of young groundwater is determined by measuring tritium and tritiogenic 3He in a groundwater sample. On the other hand, the dating method for old groundwater is not still verified. In this study, the old groundwater age is predicted by the accumulating rate of radiogenic helium through the alpha decay of uranium and thorium contained in rock.This tracing method was applied to a confined aquifer in the Kumamoto plain (10km × 20km ), where the groundwater flow and the geohydrological formation of aquifer was investigated in detail in the past. The groundwater in the area consists of mixture of young groundwater (less than 20 yrs old) and ancient isolated groundwater (more than 1000 yrs old). Furthermore, the drastic change in the helium isotopic ratio revealed unexpectedly the existence of active faults covered in groundwater basins. Consequently, the method using the dissolved noble gases is practicably available for investigating the geohydrologic formation of aquifer at the early stage of the site characterization.

2019 ◽  
Vol 109 ◽  
pp. 104395 ◽  
Author(s):  
Mohammed Hssaisoune ◽  
Lhoussaine Bouchaou ◽  
Takuya Matsumoto ◽  
Luis Araguas ◽  
Michael Kraml ◽  
...  

2015 ◽  
Vol 58 ◽  
pp. 46-61 ◽  
Author(s):  
Rohit B. Warrier ◽  
M. Clara Castro ◽  
Chris M. Hall ◽  
Fabien Kenig ◽  
Peter T. Doran

2002 ◽  
Vol 66 (5) ◽  
pp. 797-817 ◽  
Author(s):  
Werner Aeschbach-Hertig ◽  
Martin Stute ◽  
Jordan F Clark ◽  
Robert F Reuter ◽  
Peter Schlosser

Derbyana ◽  
2021 ◽  
Vol 42 ◽  
Author(s):  
Troy Gilmore ◽  
Mikaela Cherry ◽  
Didier Gastmans ◽  
Eric Humphrey ◽  
Douglas Kip Solomon

Groundwater age-dating is an important tool for quantifying and managing water resources. Groundwater age is the elapsed time between recharge (at the land surface or water table) and the time when groundwater is sampled. If groundwater is sampled at the point of discharge from an aquifer, then the age represents the groundwater transit time. Groundwater that has recharged in recent decades is considered young groundwater. In many areas, the quality and quantity of young groundwater has been impacted by human activities and groundwater age-dating is useful for quantifying current and historical water and contaminant fluxes into and through aquifers. This review is focused on the tritium-helium (3H/3He) method, which is a robust and widely applied age-dating technique for young groundwater. We present the development of the 3H/3He method and practical considerations for sampling groundwater in shallow unconfined aquifers. Along the way, we highlight available resources: (1) educational software for building intuition around groundwater age-dating and selection of sampling sites and (2) software that can be used to calculate 3H/3He age from noble gas and 3H data. We also highlight strengths and potential uncertainties associated with the method. For example, while other age-dating techniques require a known historical record of tracer concentration in the atmosphere, the 3H/3He age-dating technique does not require such historical records. However, the 3H/3He method requires measurement of two tracers to produce a groundwater age estimate (“apparent age” or “tracer age”). Precise measurement of 3H and noble gases, plus careful analysis of noble gas data to calculate the tritiogenic 3He (i.e., the portion of 3He derived from decay of 3H in the aquifer) is required to calculate the groundwater apparent age. Sampling for noble gases is sometimes challenging and requires specialized sample containers and technique. We also introduce basic sampling methods in this review but highlight how practitioners should work closely with a noble gas laboratory to obtain the correct containers and assess field conditions and/or the overall feasibility of projects. Lastly, the review highlights recent applications of the 3H/3He method, including recharge rate estimation, characterization of contaminant input histories for aquifers, quantifying groundwater transit times by sampling at aquifer discharge points, and the use of isotope data to constrain and inform numerical and statistical models of groundwater and contaminant movement in the subsurface.


2021 ◽  
Vol 3 (1) ◽  
pp. 13-20
Author(s):  
Syahrun Syahrun ◽  
Pawarti Pawarti ◽  
Halimah Halimah

Early Childhood caries is a multifactorial disease in which these factors interact. Factors of dental caries occurrence include factors from food, oral hygiene, and unhealthy habits such as food sucking and bottle feeding. Besides habitual and food factors, the condition that aggravates the caries incidence in these children is due to a parental misunderstanding of the underlying cause of caries, where the caries is triggered by giving off a sweet solution such as milk, using bottles and breast milk And the frequency of intensity is less precise. The general objective of the study was to find out the description of maternal behavior that led to the occurrence of early childhood caries in pre-school children. The type of this research is descriptive cross-sectional with survey method, the population number is 105 and sample amount 50, data collecting technique that is an early stage in the form of secondary data and dental examination, implementation phase in the form of an interview with mother to fill the questionnaire, research instrument consist of questionnaire to know Mother's behavior, examination sheet to know the stage of development of early childhood caries. The results of the study, 14 mothers (28%) aged <30 years were more likely to be very supportive of early childhood caries, 15 mothers (30%) of employment as laborers were strongly supportive of early childhood caries, 10 mothers (20%) with recent primary education Support for the occurrence of caries rampant, more than 22 children (44%) suffered caries damage stage, it was found that 23 mothers (46%) strongly supported the occurrence of early childhood caries, more children suffered caries damage stage 17 children (34%). The conclusion of this research, that most of the respondents aged> 30 years were 31 people (62%), more respondents with employment as 24 workers (48%), senior high school 18 (36%) and it is known that the behavior of more respondents strongly supports the occurrence of early childhood caries with the number of 23 people (46%). Rampan karies merupakan penyakit multifaktorial dimana faktor-faktor tersebut saling berinteraksi. Faktor kejadian karies gigi antara lain faktor dari makanan, kebersihan mulut dan kebiasaan-kebiasaan yang tidak sesuai dengan kesehatan seperti mengemut makanan dan pemberian makanan melalui botol. Selain dari faktor kebiasaan dan makanan, kondisi yang memperparah kejadian karies pada anak ini adalah karena ketidakpahaman orang tua terhadap penyebab utama terjadinya karies tersebut, dimana karies tersebut dipicu oleh pemberian larutan yang manis seperti air susu, menggunakan botol serta air susu ibu yang cara pemberian dan serta frekuensi intensitasnya kurang tepat. Tujuan umum penelitian untuk mengetahui gambaran perilaku ibu yang menyebabkan terjadinya rampan karies pada anak prasekolah. Jenis penelitian ini adalah deskriptif Cross-Sectional dengan metode survey, jumlah populasi 105 dan sampel berjumlah 50, teknik pengumpulan data yaitu tahap awal berupa pengambilan data sekunder dan pemeriksaan gigi, tahap pelaksanaan berupa wawancara dengan ibu untuk mengisi kuesioner, instrumen penelitian terdiri dari kuesioner untuk mengetahui perilaku ibu, lembar pemeriksaan untuk mengetahui tahap perkembangan rampan karies.  Hasil penelitian 14 ibu (28%) berumur <30 tahun lebih banyak berperilaku sangat mendukung terjadinya rampan karies, 15 ibu (30%) pekerjaan sebagai buruh banyak berperilaku sangat mendukung terjadinya rampan karies, 10 ibu (20%) dengan pendidikan terakhir SD sangat mendukung terjadinya rampan karies, lebih banyak 22 anak (44%) menderita rampan karies tahap kerusakan, diketahui perilaku 23 orang ibu (46%) sangat mendukung terjadinya rampan karies, lebih banyak anak menderita rampan karies tahap kerusakan 17 anak (34%). Kesimpulan di dapatkan sebagian besar responden berumur> 30 tahun berjumlah 31 orang (62%), lebih banyak responden dengan pekerjaan sebagai buruh dengan jumlah 24 orang (48%), responden dengan tingkat pendidikan terakhir yaitu SLTA dengan jumlah 18 orang (36%) dan diketahui bahwa perilaku responden lebih banyak sangat mendukung terjadinya rampan karies dengan jumlah 23 orang (46%).


2018 ◽  
Author(s):  
Zachary P. Meyers ◽  
◽  
Marty D. Frisbee ◽  
Laura Rademacher ◽  
Carolyn Box ◽  
...  

2021 ◽  
Vol 3 (1) ◽  
pp. 13-20
Author(s):  
Syahrun Syahrun ◽  
Pawarti Pawarti ◽  
Halimah Halimah

Early Childhood caries is a multifactorial disease in which these factors interact. Factors of dental caries occurrence include factors from food, oral hygiene, and unhealthy habits such as food sucking and bottle feeding. Besides habitual and food factors, the condition that aggravates the caries incidence in these children is due to a parental misunderstanding of the underlying cause of caries, where the caries is triggered by giving off a sweet solution such as milk, using bottles and breast milk And the frequency of intensity is less precise. The general objective of the study was to find out the description of maternal behavior that led to the occurrence of early childhood caries in pre-school children. The type of this research is descriptive cross-sectional with survey method, the population number is 105 and sample amount 50, data collecting technique that is an early stage in the form of secondary data and dental examination, implementation phase in the form of an interview with mother to fill the questionnaire, research instrument consist of questionnaire to know Mother's behavior, examination sheet to know the stage of development of early childhood caries. The results of the study, 14 mothers (28%) aged <30 years were more likely to be very supportive of early childhood caries, 15 mothers (30%) of employment as laborers were strongly supportive of early childhood caries, 10 mothers (20%) with recent primary education Support for the occurrence of caries rampant, more than 22 children (44%) suffered caries damage stage, it was found that 23 mothers (46%) strongly supported the occurrence of early childhood caries, more children suffered caries damage stage 17 children (34%). The conclusion of this research, that most of the respondents aged> 30 years were 31 people (62%), more respondents with employment as 24 workers (48%), senior high school 18 (36%) and it is known that the behavior of more respondents strongly supports the occurrence of early childhood caries with the number of 23 people (46%). Rampan karies merupakan penyakit multifaktorial dimana faktor-faktor tersebut saling berinteraksi. Faktor kejadian karies gigi antara lain faktor dari makanan, kebersihan mulut dan kebiasaan-kebiasaan yang tidak sesuai dengan kesehatan seperti mengemut makanan dan pemberian makanan melalui botol. Selain dari faktor kebiasaan dan makanan, kondisi yang memperparah kejadian karies pada anak ini adalah karena ketidakpahaman orang tua terhadap penyebab utama terjadinya karies tersebut, dimana karies tersebut dipicu oleh pemberian larutan yang manis seperti air susu, menggunakan botol serta air susu ibu yang cara pemberian dan serta frekuensi intensitasnya kurang tepat. Tujuan umum penelitian untuk mengetahui gambaran perilaku ibu yang menyebabkan terjadinya rampan karies pada anak prasekolah. Jenis penelitian ini adalah deskriptif Cross-Sectional dengan metode survey, jumlah populasi 105 dan sampel berjumlah 50, teknik pengumpulan data yaitu tahap awal berupa pengambilan data sekunder dan pemeriksaan gigi, tahap pelaksanaan berupa wawancara dengan ibu untuk mengisi kuesioner, instrumen penelitian terdiri dari kuesioner untuk mengetahui perilaku ibu, lembar pemeriksaan untuk mengetahui tahap perkembangan rampan karies.  Hasil penelitian 14 ibu (28%) berumur <30 tahun lebih banyak berperilaku sangat mendukung terjadinya rampan karies, 15 ibu (30%) pekerjaan sebagai buruh banyak berperilaku sangat mendukung terjadinya rampan karies, 10 ibu (20%) dengan pendidikan terakhir SD sangat mendukung terjadinya rampan karies, lebih banyak 22 anak (44%) menderita rampan karies tahap kerusakan, diketahui perilaku 23 orang ibu (46%) sangat mendukung terjadinya rampan karies, lebih banyak anak menderita rampan karies tahap kerusakan 17 anak (34%). Kesimpulan di dapatkan sebagian besar responden berumur> 30 tahun berjumlah 31 orang (62%), lebih banyak responden dengan pekerjaan sebagai buruh dengan jumlah 24 orang (48%), responden dengan tingkat pendidikan terakhir yaitu SLTA dengan jumlah 18 orang (36%) dan diketahui bahwa perilaku responden lebih banyak sangat mendukung terjadinya rampan karies dengan jumlah 23 orang (46%).


2005 ◽  
Vol 69 (7) ◽  
pp. 1665-1674 ◽  
Author(s):  
Kuno M. Strassmann ◽  
Matthias S. Brennwald ◽  
Frank Peeters ◽  
Rolf Kipfer

2008 ◽  
Vol 42 (4) ◽  
pp. 1017-1023 ◽  
Author(s):  
Bradley D. Cey ◽  
G. Bryant Hudson ◽  
Jean E. Moran ◽  
Bridget R. Scanlon

2013 ◽  
Vol 339 ◽  
pp. 291-300 ◽  
Author(s):  
Michael Jung ◽  
Martin Wieser ◽  
Amany von Oehsen ◽  
Werner Aeschbach-Hertig

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