Difference between revisions of "Radionuclide Generator"

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==== Learning Goals  ====
 
==== Learning Goals  ====
  
*To learn about radionuclide generators,
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*Understand mother-daughter relations and radioactive equilibrium
*working with short half lives,
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*Understand how a radio-nuclide generator works and how it is used
*getting more training in handling radioactive material,
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*Understand how radioactivity is "growing in"
*learing about ion-exchange collumns.
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*Training in handling radioactive material and safety procedures
  
 
==== Explanation and Exercise Guide  ====
 
==== Explanation and Exercise Guide  ====

Revision as of 03:51, 6 January 2011

This lab exercise was developed for the UiO KJM 5911 course. The students will prepare a ion-exchange collumn using DOWEX-50 ion-exchange material and extract 234Th from a 234U solution. The thorium sticks to the ion exchanger and 1.17-min 234Pa will grow inn. The column can be milked once every 12 min. The students use 234Pa samples to measure its half life.

Learning Goals

  • Understand mother-daughter relations and radioactive equilibrium
  • Understand how a radio-nuclide generator works and how it is used
  • Understand how radioactivity is "growing in"
  • Training in handling radioactive material and safety procedures

Explanation and Exercise Guide

  • Student guide - theory
  • Student guide - making the 234mPa radionuklide generator
  • Student guide - determining the half life of 234mPa
  • Instructions to teachers and supervisors
  • Experience and feed-back from teachers (please add yours also!)

Equipment

  • 2 M HCl on 100 mL flasks, one for each student)
  • DOWEX 50x4 (50-100 mesh)
  • Uranyl nitrate - UO2(NO3)2
  • NaAc + K4[Fe(CN)6] solution (on 100 mL flasks, one for each student) (prepared by mixing 8 g NaC2H3O2 and 40 g K4[Fe(CN)6] in 1 L water)
  • 5% citric acid (on 100 mL flasks, one for each student)
  • 0.1 M AgNO3 (on 50 mL flasks)
  • Suitable columns which can be fitted with a stopper connected to a rubber ball so it can be pressurized (to quickly elute drops with short lived 234Pa from the column).
  • Stop watches (one for each student)
  • Sample holders to catch eluted drops from the colund and which can be mounted conveniently in the detector chamber
  • Detectors - GM counters works well, but we have also used plastic scintillators mounted on PMTs and NaI-detectors. High efficiency is necessary to get god counting statistics even after the first 5-6 minutes. 

Safety Aspects

  • Chemical safety - nothing particulary dangerous, 2 M HCl and 0.1 M AgNO3 should of course be handled according to normal safety precations. DOWEX residues and waste should be collected and handled according to normal procedures.
  • Rad. safety - very small amounts of uranyl nitrate is used, so rad. safety is mostly about regulations and not a real healt hazzard. Remember to collect the DOWEX from the ion-exchange collumns in separate containers as it is contaminated with 24-day 234Th (will be none-radioactive after one year).