with gamma,only if Ac 227 is in equilibrium in U 235 chain. I don`t see any gamma line that you can use directly from Ac 227.
with gamma,only if Ac 227 is in equilibrium in U 235 chain. I don`t see any gamma line that you can use directly from Ac 227.
Fully agree with Jan. Depending on the origin of the sample, you migth just wait some days and measure the daughter Th-227. Of course that doesen't work if Th was not separated before.
If you want to detect Ac-227 and its daughters by a HPGe, you can refer to http://www4vip.inl.gov/gammaray/catalogs/ge/catalog_ge.shtml, and choose Ac-227, the gamma spectrum of Ac-227 and its daughters by HPGe would showed to you. but at first, you should put the sample for somedays.
The Half-life of the daughter products determine equilibrium. You can easily quantify the Th-227 using the daughter products of Ra-223, Pb-211 and Bi-211 provided the age of the material is 11.43 days X 7 half-lifes (the daughter Ra-223) or about 131 days. If you know the age of the material it is also possible to calculate the activity using the available gamma lines and correcting back to the time of separation. If you are not certain of the age, then look for good agreement between the various gamma rays lines. If it is in equilibrium the activity for the various lines should be in good activity agreement. Hope this helps.
The Half-life of the daughter products determine equilibrium. You can easily quantify the Th-227 using the daughter products of Ra-223, Pb-211 and Bi-211 provided the age of the material is 11.43 days X 7 half-life (the daughter Ra-223) or about 131 days. If you know the age of the material it is also possible to calculate the activity using the available gamma lines and correcting back to the time of separation. If you are not certain of the age, then look for good agreement between the various gamma rays lines. If it is in equilibrium the activity for the various lines should be in good activity agreement. Hope this helps.
Jan, Eric, Zeng, Brain
Thank you so much for your contribution to Ac-227 detection through gamma spectroscopy. It is fantastic and gratefully acknowledged. Riaz
It is an honour to receive Judith Marinelli Godfrey response to our discussion on Ac-227 detection by gamma spectroscopy. Judith has provided a treasure of references to pioneering gamma spectroscopy work by Leonidas D Marinelli. Thank you Judith.
Riaz Akber
PhD (Radioactivity), MSc (Nuclear Technology)
Founder member, Former President South Pacific Environmental Radioactivity Association (SPERA)
Fellow, Australasian Radiation Protection Society (ARPS)
Director, Safe Radiation Pty Ltd
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