[Fast-Neutrons] Fiber scintillators for fast neutron imaging
ilmor at soreq.gov.il
Wed Dec 18 12:26:40 CET 2019
Initially we bought our 20 cm x 20 cm fiber screen (0.5mm fibers, 3cm thick) from Saint-Gobain.
Later on, a similar screen was purchased from Crytur. It had less defects and much faster delivery time.
I believe that a larger screen with 250um fibers can be made. One has to discuss this with the relevant companies.
מאת: Alan Hewat [mailto:alan.hewat at neutronoptics.com]
נשלח: יום ד 18 דצמבר 2019 11:58
אל: אילן מור
עותק: fast-neutrons at neutronsources.org
נושא: Fibre scintillators for fast neutron imaging
Ilan, Thank you for bringing your nice paper<https://www.sciencedirect.com/science/article/pii/S0168900211005390> to our attention. I was particularly interested in two points you made about fast neutron scintillators:
1) With a large aperture lens (f/0.95) the small depth of field gives better resolution than might be expected from thick (10mm) slab scintillators because you focus on the surface.
2) Already available 250 micron fibre scintillators can be made quite thick because the fibre coating prevents cross-talk between fibres. If only such scintillators could be made with areas big enough to cover Michael's 200 micron pixel detector. That's already quite good resolution for hot neutrons.
On Wed, 18 Dec 2019 at 10:05, Ilan Mor <ilmor at soreq.gov.il<mailto:ilmor at soreq.gov.il>> wrote:
We used in the past a steel mask with line pairs which was used to quantify the CTF of our system (see description in the attached paper).
Unfortunately this mask was lost.
Our colleague from PTB produced a similar mask made of heavy met.
מאת: fast-neutrons-bounces at neutronsources.org<mailto:fast-neutrons-bounces at neutronsources.org> [mailto:fast-neutrons-bounces at neutronsources.org<mailto:fast-neutrons-bounces at neutronsources.org>] בשם Michael Taylor
נשלח: יום ג 17 דצמבר 2019 19:23
אל: Lehmann Eberhard (PSI); Alan Hewat
עותק: fast-neutrons at neutronsources.org<mailto:fast-neutrons at neutronsources.org>
נושא: POSSIBLY SPOOFED: Re: [Fast-Neutrons] characterization of fast neutron setups
Dr Alan Hewat, NeutronOptics, Grenoble, FRANCE
<Alan.Hewat at NeutronOptics.com> +33.4188.8.131.52
http://www.NeutronOptics.com/hewat TVA FR 79499450856
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