Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 1246)

Change: 4. Modern Advances in Prostate Brachytherapy. Available at: http://www.aapm.org/meetings/05SS/program/ProstateAdvances_lief.pdf. Accessed April 7, 2009.References:1. Sentinel.thomasnet.com. Ytterbium-169. Available at: http://sentinel.thomasnet.com/item/sources-source-holders/sources/pn-1255?&seo=110. Accessed on March 16, 2009.2. Pubmed.gov. Ytterbium-169. Available at: http://www.ncbi.nlm.nih.gov/pubmed/1508110. Accessed on March 16, 2009.3. Radioactive Elements. Available at: http://theodoregray.com/PeriodicTable/Elements/070/data.s7.html. Accessed on March 17, 2009.4.   View changes from previous version. (Word count: 1246)

Change: 2. Ytterbium-169 Sources. Available at: http://www.entsys-tech.com/ndt/group1radiographicsystems/ytterbium-169.htm. Accessed April 7, 2009.References:1. Sentinel.thomasnet.com. Ytterbium-169. Available at: http://sentinel.thomasnet.com/item/sources-source-holders/sources/pn-1255?&seo=110. Accessed on March 16, 2009.2. Pubmed.gov. Ytterbium-169. Available at: http://www.ncbi.nlm.nih.gov/pubmed/1508110. Accessed on March 16, 2009.3. Radioactive Elements. Available at: http://theodoregray.com/PeriodicTable/Elements/070/data.s7.html. Accessed on March 17, 2009.4. Ytterbium.   View changes from previous version. (Word count: 1191)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 1150)

Change: -The source strength can be measured directly with an ion chamber or calculated indirectly from the source radioactivity [Bq] with corrections for encapsulation. 14 Used in formula/calculation: Mean Life (T avg)= 1.44 T1/2 Mean Life= 1.44 x 32 days = 46.08 daysDc= Do x TavgDc= 10   View changes from previous version. (Word count: 1146)

Change: -possible use in a portable X-ray machine 4-is a promising new radionuclide for intravascular radiotherapy (IVBT). It has a much better penetrating power through calcified plaques and stents   View changes from previous version. (Word count: 1027)

Change: http://www.sciencedirect.com/science?_ob=Article. Accessed on March 30, 2009.12. Biomed Experts. Dosimetric characteristics, air-kerma strength calibration and verification of Monte Carlo simulation for a new Ytterbium-169 brachytherapy source. Available at: http://www.biomedexperts.com/Abstract.bme/8138449/Dosimetric_characteristics_air-kerma_strength_calibration_and_verification_of_Monte_Carlo_simulation_for_a_new_Ytterbium. Accessed on March 30, 2009.Color Codes:Purvi - OrangeAlia - GreenAngie - BlueTracey -Red   View changes from previous version. (Word count: 1037)

Change:  http://www.dosimetrytrainingtool.com.10. Sentinal.thomasnet.com. Ytterbium 169. Available at: http://sentinel.thomasnet.com/item/sources-source-holders/sources/pn-1255?&seo=110. Accessed on March 27, 2009.11. Science Direct. Ytterbium-169: A promising new radionuclide for intravascular brachytherapy. Available at: http://www.sciencedirect.com/science?_ob=Article. Accessed on March 30, 2009.Color Codes:Purvi - OrangeAlia - GreenAngie - BlueTracey -Red   View changes from previous version. (Word count: 977)

Change: A choice of isotopes provides solutions for the widely varying requirements demanded by differ ent materials and site conditions. Sources with outputs ranging from less than one curie up to several hundred are available-all precision con structed to ensure the highest possible specific activities and the smallest focal spot sizes.10   View changes from previous version. (Word count: 893)

Change: The Physics of Radiation Therapy. 3rd Edition. Philadelphia: Lippincott Williams & Wilkins; 2003. p. 545.9. Module 7, Session 9, pp.11-15. Accessed March 26, 2009, Stanford Web-Based Dosimetry Training Tool. Available at: http://www.dosimetrytrainingtool.com.http://www.dosimetrytrainingtool.com.Color Codes:Purvi - OrangeAlia - GreenAngie - BlueTracey -Red   View changes from previous version. (Word count: 735)