Search found 94 matches

by pilgrim
08 Jul 2018, 16:12
Forum: Shielding
Topic: Old lead
Replies: 23
Views: 12477

Re: Old lead

Good morning Alain, many thanks for your post, very clear and interesting, and for time you dedicated to it. When the liner will be finished, probalbly I'll buy other lead, but in sheets this time! To wrap around the existing shield, to increase the thickness keeping it demountable. Probably at the ...
by pilgrim
08 Jul 2018, 01:59
Forum: Introductions >> Start Here !
Topic: Hello from underground :)
Replies: 5
Views: 3010

Re: Hello from underground :)

Fantastic introduction Alain! Very impressive!
If I were you I would be frightened from that place, I would be afraid to met Samara Morgan! :-):-):-)

Seriously, I would fear the humidity : the enemy n°1 for electronic instruments!
by pilgrim
08 Jul 2018, 01:48
Forum: Shielding
Topic: Old lead
Replies: 23
Views: 12477

Re: Old lead

I'm used to take spectra in the basement, to have lower background and to have minimum temperature differences between day and night. Actually it's the place with higher Radon concentration (checked with a Corentium, i have 300 Bq/mq in a couple of day), but I always leave the windows open to keep t...
by pilgrim
07 Jul 2018, 22:01
Forum: Shielding
Topic: Old lead
Replies: 23
Views: 12477

Re: Old lead

Hi Alain, I cast the lead in Green Sand, a mixture of sand and bentonite (15-20% bentonite). I created the mold around a steel ring as a positive, then, once removed the ring I poured the fused lead into the mold. The inner ring's diameter is 175mm and 215mm the external. After the castings I machin...
by pilgrim
07 Jul 2018, 13:15
Forum: Shielding
Topic: Old lead
Replies: 23
Views: 12477

Re: Old lead

Hi Alain, thanks for your reply. Just few days ago I melted all the ingots into 9 rings and a bottom and believe me, only God knows how much oxide and dirt I removed! But now the shield is almost ready, only the liner is missing. Before melting the lead I made a comparison with a standard lead ingot...
by pilgrim
13 Jun 2018, 04:08
Forum: Detectors
Topic: ion chamber
Replies: 1
Views: 2180

Re: ion chamber

I think you have to ask to Livio, engineering@theremino.com, for more information.
by pilgrim
08 Apr 2018, 03:00
Forum: Spectrum
Topic: Thermal water, Bad Gastein
Replies: 3
Views: 2208

Re: Thermal water, Bad Gastein

Very interesting and nice spectrum.
by pilgrim
05 Apr 2018, 14:30
Forum: Shielding
Topic: Ask Wolfram Alpha about half value layer
Replies: 7
Views: 5994

Re: Ask Wolfram Alpha about half value layer

Hi Geoff,
do you put the tungsten layer inside or outside the lead?
by pilgrim
04 Apr 2018, 14:30
Forum: Shielding
Topic: Ask Wolfram Alpha about half value layer
Replies: 7
Views: 5994

Re: Ask Wolfram Alpha about half value layer

I didn't know Wolfram Alpha : thank you!
by pilgrim
25 Mar 2018, 18:59
Forum: Spectrum
Topic: Starter with Kr85
Replies: 2
Views: 1688

Re: Starter with Kr85

Hi Peter, interesting.
Do you think these tube starters are still available, for example on eBay?