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Measurement of difficult-to-measure isotopes

Measurement of difficult-to-measure isotopes

 With gamma-spectrometry: 108mAg, 129I
 With LSC:3H, 14C,36Cl, 90Sr, 99Tc
 With alpha-spectrometry: transuranic isotopes (e.g. 239+240Pu, 241Am)
 Using ICP-MS: 79Se, 93Zr, 107Pd

Difficult-to-measure (DTM) isotopesare usually either pure alpha/beta emitters or have only very low energy and intensity X-ray or γ-ray lines. As a result, the determination of their concentrationsis possible only after radiochemical separations of various complexities. If the necessary conditions (physical-chemical form and radiochemical purity) are met, the following techniques are used for measurements:

Gamma-spectrometry:

  • 108mAg (silver-oxide precipitation on filter plate),
  • 129I (AgI precipitation on filter plate)

LSC:

  • 3H (high-purity distilled water + UltimaGold LLT)
  • 14C (NaOH/NaHCO3 solution + Hionic-Fluor or BaCO3 precipitate dispersed in InstaGel Plus)
  • 36Cl (NaCl solution in InstaGel Plus)
  • 90Sr (strontium-oxalate precipitate dispersed in InstaGel Plus)
  • 99Tc (TEVA resindispersed in InstaGel Plus)

Alpha-spectrometry

  • NdF3 micro-precipitate plates of transuranic isotopes (e.g. 239+240Pu, 241Am)

ICP-MS:

  • In case of some long-lived beta-emitters (e.g. 79Se, 93Zr, 107Pd), conventional counting methods, like LSC cannot be applied because the radiotracer (95Zr, 103Pd) for chemical yield determination wouldinterfere with it. However, the long half-life of these isotopes mean that they can be effectively measured by ICP-MS if the possible interferences are removed.

Contacts

bihari arpi
NameÁrpád Bihari
Qualifications environmentalist (specialization in physics), English-Hungarian special translator
Job description Assistant Research Fellow
Specializations radiochemistry, gamma-spectroscopy
E-mail
Mobile number  
Phone number 11217
janovics robert2
NameRóbert Janovics PhD.
Qualifications environmentalist (specialization in chemistry and physics)
Job description Research Fellow
Specializations LSC measurement techniques, analytical method development
E-mail
Mobile number  
Phone number 11214
dezso zoltan
NameZoltán Dezső Dr. Univ.
Qualifications chemistry and physics teacher
Job description Research Fellow
Specializations radiochemistry, alpha-, beta- gamma-spectroscopy, biomonitoring
E-mail
Mobile number  
Phone number 11314
Braun Mihaly
NameMihály Braun PhD.
Qualifications biologist, instrumental analytical chemistry expert
Job description Deputy Head of Laboratory
Specializations ICP-MS, LA-ICP-MS, MP-AES measurement, sampling
E-mail
Mobile number  
Phone number 11090
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