Search found 56 matches

by pietkuip
19 Jan 2016, 11:56
Forum: Detectors
Topic: Cosmic Ray
Replies: 21
Views: 10057

Re: Cosmic Ray

Directly in the sensor. I have the pi-camera covered with black electrical tape. It has been running for a few days now, and I do not see many events. I will start a new thread in a few days, hopefully with some interesting traces. The pi-cam has a cmos sensor. Maybe it is better to use a ccd camera...
by pietkuip
13 Jan 2016, 08:15
Forum: Detectors
Topic: Cosmic Ray
Replies: 21
Views: 10057

Re: Cosmic Ray

Nice Lodovico!

I am right now trying to detect the traces that muons make when they pass through the silicon of an image sensor. My sensor is small though (Raspberry Pi camera), so this takes some time.
by pietkuip
12 Dec 2015, 22:06
Forum: Shielding
Topic: Magnetite ore for Sheilding
Replies: 2
Views: 3176

Re: Magnetite ore for Sheilding

It is not just the density, it is mostly the atomic number Z and the binding energies of the inner electrons. So mixing in iron (Z=26) with concrete (silicon, Z=14) improves the shielding of concrete without costing much. (Iron ore is very cheap now.) But it is not nearly as good as lead (Z=82). I s...
by pietkuip
28 Oct 2015, 12:22
Forum: Detectors
Topic: Cableing
Replies: 9
Views: 4165

Re: Cableing

The pulses from NaI detectors are not fast, so one does not need to keep the cables short.
by pietkuip
18 Oct 2015, 05:01
Forum: Spectrum
Topic: Uranium without daughters
Replies: 3
Views: 2739

Re: Uranium without daughters

So that is the tungsten K-alpha line at 59 keV?
Is that a reason to use a tungsten shield, to see actinide K-alphas?
by pietkuip
02 Oct 2015, 05:38
Forum: Software
Topic: ProSpect (Canberra) quick guide
Replies: 16
Views: 9741

Re: ProSpect (Canberra) quick guide

I do not think I have used the course of fine gain setting on the Osprey. I am not quite sure what it does, might be a setting of an analog amplifier, might be a digital thing in software. They also talk about "conversion gain", which I understand as the number as channels. I am not sure if I unders...
by pietkuip
01 Oct 2015, 22:03
Forum: Software
Topic: ProSpect (Canberra) quick guide
Replies: 16
Views: 9741

Re: ProSpect (Canberra) quick guide

The real range can be changed by changing the high voltage of the photomultiplier tube, so you should probably decrease that. The numbers on the horizontal scale depend on the calibration. It starts with a default scaling of 1 keV per channel. One can change that when one knows what peak is at what ...
by pietkuip
14 Sep 2015, 08:52
Forum: Introductions >> Start Here !
Topic: First experience
Replies: 3
Views: 2287

Re: First experience

If there was lead shielding, the peak at 87 keV ("what is this?") is probably K-alpha x-rays from lead.
by pietkuip
25 Jun 2015, 07:27
Forum: Detectors
Topic: XR-100CR Si-PIN X-Ray Detector + PRA
Replies: 7
Views: 6269

Re: XR-100CR Si-PIN X-Ray Detector + PRA

On http://www.sciencemadness.org/talk/viewthread.php?tid=28582 , I came across this site: http://freshlab.org/detektor/?lang=eng ; inexpensive ("less than 20 euros"), and amazing results. The Polish version seems to offer some more detail. Also, that spectrum is a bit less spectacular. Polish presen...
by pietkuip
22 Jun 2015, 19:07
Forum: Spectrum
Topic: Gamma Ray Bursts and X-Ray Flares Detected!
Replies: 6
Views: 3404

Re: Gamma Ray Bursts and X-Ray Flares Detected!

In particle physics, many promising 3-sigma results have turned out to be nothing more than statistical fluctuations. Good journals now require 5σ. But such evidence would not be good enough for a nobel prize.