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  1. H

    Physics Regarding postdoc

    thank you, but i didnt get the specified results
  2. H

    Specific activity of radionuclides

    what is the formula to determine the specific activity of radionulcide in sediments
  3. H

    Physics Regarding postdoc

    I have worked on environmental radiation levels n determining the radioactivity in the environmental samples. I would like to do post doc in the field. I request to suggest me the posts available all over the world.
  4. H

    Correlation between macronutirients and radionuclides

    i got the point regarding. thank you. since clay particles have high cation exchange capacity, why cant the radinuclides can be embbeded in clays??
  5. H

    Granulometric analysis

    thank you for the answer sir, the link i went through is also useful in clarifying the doubts.
  6. H

    Correlation between macronutirients and radionuclides

    As both exist in clay particles, that have high exchange capacity?
  7. H

    Correlation between macronutirients and radionuclides

    do the presence of macronutrients (N,P,K) increase the amount of radionuclides (U,Th,K) in the sediments. how are they related?
  8. H

    Granulometric analysis

    thanks for the reply, do there exists any relation between the minerals (Zn, Cu, Mn, Fe) that is found in the sediments with that of radionuclides (U, Th, K)?
  9. H

    Granulometric analysis

    why do we need to determine the particle size while estimating the activity of radionuclides? is there any relation between the particle size (sand, silt and clay) and primordial radionuclide? will the content of uranium, thorium and potassium rely on particle sizes?
  10. H

    Regarding minerological analysis

    thank you for the clarification.
  11. H

    Regarding minerological analysis

    which oxide is responsible for the increase of uranium -238 in the sediments of rivers. is it U(IV) oxide is soluble or U(VI) is soluble in water?
  12. H

    Regarding minerological analysis

    Uranium can exist in five oxidation states: +2, +3, +4, +5 and +6. However, only the +4 and +6 states are stable enough to be of practical importance. Tetravalent uranium is reasonably stable and forms hydroxides, hydrated fluorides and phosphates of low solubility. Hexavalent uranium is the...
  13. H

    Regarding minerological analysis

    why we need to find the minerals in the sediments while estimating the amount of radionuclides. although there exist a cation exchange capacity in the minerals, do they actually concentrate the primordial radionuclides in them. further on granulometric analysis, do the clay particles retain the...
  14. H

    Radionuclides of radon and thoron

    thank you sir
  15. H

    Radionuclides of radon and thoron

    what is the difference between Bq/m3 and Bq/Kg/h. can the exhaltion rate of radon and thoron for the sediments can can be in the units of Bq/Kg/h.
  16. H

    B How to calculate the uncertainity errors

    whether poissons's distribution give the exact value of the errors associated at same instant of time.
  17. H

    B How to calculate the uncertainity errors

    further i have been working on environmental radiation, to estimate the amounts. as per the Bharathidasan Univesity , we need some reviwers who could evaluate the thesis and send back the report. i request to the persons who are willing to do me a a favour regarding this.
  18. H

    B How to calculate the uncertainity errors

    further on as Th-232 has to be estimated from the soil/sediments. as it is not a gamma ray emitter, the daughter product of Tl-208 is considered. how safe is this approximation, since Tl-208 is of third branch of the decay series, do we need to multiply the amounts by 3. or the counts directly...
  19. H

    B How to calculate the uncertainity errors

    thank you, i had understood the concept behind it. i whole heartedly thank you as i would derive the equation with the uncertainity errors. including the activity, background counts and the time interval for each count.
  20. H

    B How to calculate the uncertainity errors

    we have meausred the primordial radionuclides in the sediments using NaI gamma ray detector. we measured the counts of the radionucldies and the activity of the radionuclides such as U, Th and K. we would be adding some uncertainity errors along with the specific activity with + and - sign. i...
  21. H

    B What is the self absorption parameter

    i would like to know the self absorption parameter of 3x3 inches NaI crystal. which is used in estim,ating the radionuclides
  22. H

    B How to calculate the uncertainity errors

    do any one explain me pl. i would like to know the uncertainty error in measuring the specific activity of the primordial radionuclides
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