开云体育

On Sunday, November 8, 2020, 12:26 AM, taray singh via groups.io <sukhjez@...> wrote:

Geo

Ignore the nov

It’s?just there to organize my samples since changing settings?

nov is for November?

The one with lead water?control sample ?is?filter paper wet with clean?RO water?

Lead water is RO residue?

Am241 is for calibration check?

Taray

On Saturday, November 7, 2020, 11:37 PM, GEOelectronics@... wrote:

One more question, do you have a long time background test with no exciter or sample?

If not, please put that on your list of things to do, for same 2800 seconds or whatever long time you use.

Geo

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From: "taray singh via groups.io" <sukhjez@...>
To: [email protected]
Sent: Saturday, November 7, 2020 4:51:28 AM
Subject: Re: [XRF] Chinese water filter analysis

Geo

I am not sure of the shifting downward trend.

But most of my low Z samples esp containing organics such C,H ,O or N tend to have scattering peaks at 13 ,16 ,20 and 50.

Their broad nature suggest they are Compton scattering .

Taray

On Saturday, November 7, 2020, 6:16 PM, GEOelectronics@... wrote:

Good work Taray. I was thinking the 3 large peaks were backscatter from the exciter source, but with your calibration they seem to be clearly shifted downward, do you have a theory?

Geo

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From: "taray singh via groups.io" <sukhjez@...>
To: [email protected]
Sent: Saturday, November 7, 2020 12:07:34 AM
Subject: Re: [XRF] Chinese water filter analysis

Hi guys
Repeated this test with more sample? concentrate .
Sampling preparation is important for optimal results.
Soaking a filter paper direct works better than scanning through plastic containers.
This is not a clinical trial so issue of bias does not exist but to have an open mind.
The gains are improved this time.Further improvements via fine gain control will be attempted next time.
Slow learning curve...
Results are suggestive of lead in drinking water.
Suggestive? is good enough for affirmative action,
Don't drink stagnated water from taps.Flush before drinking,
Most of these heavy metals come from plumbing system.
Most publications on water lead? content point to near normal levels
Higher levels ones? will face hurdles before publication.
Thanks
Taray