Ruthenium-106/Rhodium-106

Ruthenium-106/Rhodium-106 - UW-L Brachy Course




Ru-106/Rh-106






Relevant historical data:

Ruthenium 106 - discovered in 1844 by Karl Klaus; named after the Latin word Ruthenia (Russia).
Rhodium 106 - discovered in 1803 by William Wollaston; name=Greek - rhodon (rose).
Lommatzsch and Vollmar introduced the use of Ruthenium 106 and Rhodium 106 eye plaques in 1966.

Chemical/Radioactive Composition:

Transition Metal-Group #8, Period# 5
Chemical Symbol: Ru
Atomic number (Z, # of protons)=44
Mass number (A, # of protons + neutrons)= 106
Ru-106 - Atomic mass=105.9; number of neutrons=62.
Rh-106 - Atomic mass=105.9; number of neutrons=61.

Energy Characteristics:

Average energy= 96.9Kev,


Ru-106 decays by beta emission with decay energy (.039MeV) to Rh-106.
Rh-106 decays by beta emission with decay energy (3.541 MeV) to Pd-106.

Exposure Rate Constant:

  • Rh-106 - 0.138158

  • Half-life Properties:

    Ru-106: Half Life is 373.59D; or 1.02 years;
    Rh-106: Half life is 29.9 seconds.

    Forms available for use:

    Ruthenium 106 - used in Platinum alloys;
    Rhodium 106 - used in coatings.

    HVL in lead:

    HVL in lead=Range max E= 1800mg/cm2
    HVL in water= 24mm

    Measurement/Calibrations/QA:

    Visual inspection, surface contamination, leakage, and dose-rate verification. The surface contamination test consists of a wet wipe test at moderate pressure. The certified energy dose-rate statements of the manufacturer are examined with a 1 mm(3) plastic scintillator for consistency. http://serials.cib.unibo.it/cgi-ser/start/it/spogli/df-s.tcl?prog_art=4578299&language=ITALIANO&view=articoli

    Used in formula/calculation:

    Calculation of radiation dose:Dose rate in mGy X depth in mm

    Uses in Radiation Oncology:

    Ru-106 is used to treat choroidal and ocular with the use of eye plaque or applicator.

    Treatment Planning:

    Dose calculation are typically done with tables provided by manufacturer.

    One other interesting fact:

    Ru-106 and its short-lived daughter Rh-106 contribute an important fraction of the residual radiation in reactor fuels a year following their use. Recovery of the unused fissionable material is made difficult because of the radiation hazard and the chemical similarity between Ruthenium and Platinum.


    Links:
    http://environmentalchemistry.com/yogi/periodic/Ru-pg2.html#Nuclides
    http://atom.kaeri.re.kr/index.html http://www.britannica.com/eb/article-9064506/ruthenium http://www.chemicalelements.com/elements/ru.html
    http://eyecancer.com/Research/Research.aspx?nID=48&Research=Compare+the+Results+of+Iodine-125%2c+Ruthenium-106+and+Palladium-103+Plaques&nResearchCategoryID=1&sResearchCategory=Articles
    http://www.ritverc.com/pdf/ORIBI_list.pdf
    http://www.dosimetrytrainingtool.com/dtt/portal/portal?a=17&cocoon-portal-event=34&cocoon-portal-event=35&cocoon-portal-event=36&p=0.Search
    http://radonc.usc.edu/uscradonc/Downloadable/PS5/UserGuide/References/PDF/Red_J_Articles/AmerBrachyRec03.pdf
    http://www.seedos.co.uk/eye%20applicators.htm
    References:

    "Ruthenium-106 Brachytherapy for Uveal Melanomas- Preliminary Results : A Single Institutional Experience." Rodrigo Souza Dias,Adelmo José Giordani,Clélia Maria Erwenne Accessed at http://www.scielo.br/pdf/rb/v40n2/en_08.pdf on March 29,2008

    http://www.iem-inc.com/toolgam.html

    EnvironmentalChemistry.com

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