[Fast-Neutrons] Fast-Neutrons Digest, Vol 8, Issue 1

Robert Adams robertadams21 at gmail.com
Sun Apr 5 10:27:56 CEST 2020


Dear Dr. Walfort,

Thank you for sharing the very interesting results of the new scintillator
screen development. This approach of layering a thick layer of plastic with
a thin layer of ZnS seems very promising.

I would be interested to know a couple further details if possible:

- The indicated 0.5 mm repeating structure, is that 0.5 mm pitch in total
(0.25 mm of Fe, 0.25 mm of air, then repeated), or 0.5 mm Fe then 0.5 mm
air then repeated?
- What was the approximate fast neutron flux at the screen during the
measurement?
- What grayscale value did the flat field image read in 80 seconds?
- What f-number lens?

The last three relate to getting some kind of rough estimate of "detection
efficiency", although I know that is actually a messy thing, because I know
the higher energy neutrons are producing significantly more light, and
therefore represent a larger fraction of the visible light picked up by the
CCD.

I think it would be also interesting if possible at some point to take an
edge spread function measurement, e.g. with a 5-10 mm block of tungsten or
steel or whatever, and from that calculate line spread and MTF.

Kind regards,

Robert


Robert Adams, Dr. sc.
IET-LKE ML K19
ETH Zürich
Sonneggstrasse 3
8092 Zürich, Switzerland
Office: +41 (0) 44 632 49 01
Mobile: +41 (0) 78 611 39 39


On Mon, Mar 2, 2020 at 11:31 AM <fast-neutrons-request at neutronsources.org>
wrote:

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> Today's Topics:
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>    1. Improved spatial resolution for imaging with fast neutrons
>       (Bernhard Walfort)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 2 Mar 2020 10:57:33 +0100
> From: "Bernhard Walfort" <walfort at rctritec.com>
> To: "Bernhard Walfort" <walfort at rctritec.com>
> Subject: [Fast-Neutrons] Improved spatial resolution for imaging with
>         fast neutrons
> Message-ID: <003f01d5f079$3ce3d190$b6ab74b0$@rctritec.com>
> Content-Type: text/plain; charset="us-ascii"
>
> Dear all,
>
>
>
> We want to inform you that, thanks to people from LANSCE, FRM II and PSI,
>
> we were able to develop a new Scintillation screen with improved spatial
> resolution for imaging with fast neutrons.
>
> We reached in the measurements last week at FRM II spatial resolutions down
> to ~200 micrometer,
>
> which is in comparison to our standard PP/ZnS:Cu (2.4 mm) a real
> breakthrough!
>
> Unfortunately, the light output is reduced (25 - 50% in comparison to the
> standard PP/ZnS), but still in a reasonable range.
>
> We were able to have the outstanding images shown with 80 s illumination.
>
>
>
>
>
>
>
> Please have a look to the attached file for further details!
>
>
>
> Those screens are producible in standard dimensions of 400 x 400 mm2 or 200
> x 200 mm2.
>
> Intermediate or smaller sizes are producible by request.
>
> Larger sizes up to 420 x 420 mm are feasible with little extra cost.
>
>
>
> We can produce with different phosphor types (ZnS:Ag; ZnS:Cu or Zn(Cd)S:Ag)
> for different emission wavelength,
>
> but actually we saw lowest gamma sensitivity for ZnS:Ag.
>
>
>
> We have to inform, that few further improvement work is planned at FRM II,
>
> but the actual scintillator configuration works definitely fine!
>
>
>
> For further information or any other request you can contact us in the
> usual
> way.
>
>
>
> With our very best regards
>
>
>
> Bernhard Walfort
>
>
>
> -----------------------------------------
>
> Dr. Bernhard Walfort
>
> RC Tritec AG / LumiNova AG
>
> Speicherstrasse 60 a
>
> CH-9053 Teufen
>
> Tel.: +41 71 335 73 73
>
> Fax: +41 71 335 73 74
>
> E-Mail: walfort at rctritec.com <mailto:walfort at rctritec.com>
>
>
>
> Please visit our new website! www.rctritec.com <http://www.rctritec.com/>
>
>
>
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