References
http://www.britannica.com/EBchecked/topic/123260/cobalt-60
http://hsc.csu.edu.au/chemistry/core/identification/chem925/925net.html
http://www.world-nuclear.org/info/Non-Power-Nuclear-Applications/Radioisotopes/Radioisotopes-in-Industry/#.UY2ltLVmiSo
http://www.gammarad.it/en/pdf/Beneficial%20Uses%20Of%20Cobalt60.pdfhttp://www.qsa-global.com/sources/industrial-isotopes/cobalt-60.aspx
http://www.epa.gov/radiation/radionuclides/cobalt.html#properties
http://ehsrms.uaa.alaska.edu/RSDSCo60.pdf
http://medical-dictionary.thefreedictionary.com/cobalt-60
http://www.irradiationpanel.org/index.php/about-irradiation/science-in-action/the-irradiation-industry-how-is-irradiation-carried-out/
http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/technetium.html
http://backreaction.blogspot.com.au/2008/11/technetium-99.html
http://www.uq.edu.au/ohs/pdfs/Tc99mguideline.pdf
http://large.stanford.edu/courses/2011/ph241/bhattacharyya2/
http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_gateway/radiation/treatmentrev2.shtmlhttp://www.isomedix.com/Gamma/http://emergency.cdc.gov/radiation/isotopes/cobalt.asp
http://www.info.gov.hk/dh-rhu/english/pdf/Co-60%20english.pdf
http://hsc.csu.edu.au/chemistry/core/identification/chem925/925net.html
http://www.world-nuclear.org/info/Non-Power-Nuclear-Applications/Radioisotopes/Radioisotopes-in-Industry/#.UY2ltLVmiSo
http://www.gammarad.it/en/pdf/Beneficial%20Uses%20Of%20Cobalt60.pdfhttp://www.qsa-global.com/sources/industrial-isotopes/cobalt-60.aspx
http://www.epa.gov/radiation/radionuclides/cobalt.html#properties
http://ehsrms.uaa.alaska.edu/RSDSCo60.pdf
http://medical-dictionary.thefreedictionary.com/cobalt-60
http://www.irradiationpanel.org/index.php/about-irradiation/science-in-action/the-irradiation-industry-how-is-irradiation-carried-out/
http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/technetium.html
http://backreaction.blogspot.com.au/2008/11/technetium-99.html
http://www.uq.edu.au/ohs/pdfs/Tc99mguideline.pdf
http://large.stanford.edu/courses/2011/ph241/bhattacharyya2/
http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_gateway/radiation/treatmentrev2.shtmlhttp://www.isomedix.com/Gamma/http://emergency.cdc.gov/radiation/isotopes/cobalt.asp
http://www.info.gov.hk/dh-rhu/english/pdf/Co-60%20english.pdf
Reliability and Validity of Sources:
For a source to be reliable it must be trustworthy and dependable. Through my development of this assessment I have tried to derive information that I believe is a trustworthy source. Refraining from using unreliable sources such as wikipedia, blogs or forums has been a way of preventing this. Through the use of reliable sites such as http://www.britannica.com/EBchecked/topic/123260/cobalt-60 and http://www.info.gov.hk/dh-rhu/english/pdf/Co-60%20english.pdf one of which is a government site, I can be postive that my information is as reliable as posible.
A Source must not only just be reliable but must most importantly be valid as well. Validity is where your content must be suitable for answering the questions and to be able to fulfill all the criteria that is needed. In doing this you must provide and use sources that are professional, creditable, published, relevant, unbiased and current. An example of a professional source would be http://www.epa.gov/radiation/radionuclides/cobalt.html#properties. This government website would prove to be a valid source for your use. An education website or source is another example for deriving valid information, such as http://hsc.csu.edu.au/chemistry/core/identification/chem925/925net.html.
Containing both reliable and valid sources are very significant in choosing truthful information for any assessment.