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Hi Charles, close but no Am involved. The exciter is natural U-238, we are seeing the decay of the daughter Pa-234m (also known as UX2). We are essentially seeing only the birth of the?U-234daughter from? Pa-234m, just that part of the natural U-238 decays series. When depleted U has been chemically separated from its daughters you wind up with only U-238, the quickly the ingrowth of the first 3 daughters Th-234>Pa-234m>U234.? U-234 has a 240,000 year half-life, so lower daughters will eventually grow back in, but in geological time scales.? The disc is actually marked "UX2 beta, and is source of Pa-234m beta particles, but we're looking deeper than that. A picture of that decay series and its STOP sign is in an earlier post. Geo ----- Original Message ----- From: Charles David Young <charlesdavidyoung@...> To: XRF <[email protected]> Sent: Fri, 30 Oct 2020 22:27:34 -0400 (EDT) Subject: Re: [XRF] 59.5keV spectrum cleanup I am not sure exactly what I am looking at here but I like the sharpness of the peaks and the low noise.? Is this a scan with an Am241 exciter?? See attached. Charles ----- Original Message ----- From: Charles David Young <charlesdavidyoung@...> To: XRF <[email protected]> Sent: Fri, 30 Oct 2020 22:27:34 -0400 (EDT) Subject: Re: [XRF] 59.5keV spectrum cleanup I am not sure exactly what I am looking at here but I like the sharpness of the peaks and the low noise.? Is this a scan with an Am241 exciter?? See attached. Charles On Fri, Oct 30, 2020 at 5:36 PM <GEOelectronics@...> wrote:
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