|
Some pics at start,? after an hour,? and then a few hours later.?
Rough side of filter material facing up this time!?
|
Nick,
With only 0.2 pCi/L after
4.3 hrs says you don’t have much of a Radon problem or that mancave is pretty
well aerated.
Dud
?
?
Some pics at start,? after an hour,? and then a few hours
later.?
Rough side of filter material facing up this time!?
|
I suppose so!? Like I said, the exhaust fan was on, so it would be pulling some air through leaks.? How do you feel about the spectrum shape now?? If you let me know soon enough, I could maybe knock out a few filter cards for you today but I have a lot of prep to do for driving west tomorrow.
On Fri, Jul 1, 2022 at 10:35 AM Dude < dfemer@...> wrote:
Nick,
With only 0.2 pCi/L after
4.3 hrs says you don’t have much of a Radon problem or that mancave is pretty
well aerated.
Dud
?
?
Some pics at start,? after an hour,? and then a few hours
later.?
Rough side of filter material facing up this time!?
|
Shape looks good . what
filters are you using? The HQ FP5211-47 and the FPAE-47 give a filter error and
restricted flow. From a GAST vac pump. (26lpm) The PTFE5u work ok (30lpm) in
the metal carrier. But shows a filter error due to the carrier without 2 dot
holes.. I'll send pictures later.
Dud
?
?
?
I suppose so!? Like I said, the exhaust fan was on, so it would be
pulling some air through leaks.? How do you feel about the spectrum shape
now?? If you let me know soon enough, I could maybe knock out a few filter
cards for you today but I have a lot of prep to do for driving west tomorrow.
?
toggle quoted message
Show quoted text
On Fri, Jul 1, 2022 at 10:35 AM Dude <dfemer@...>
wrote:
Nick,
With only 0.2 pCi/L after 4.3 hrs says you don’t have much of a
Radon problem or that mancave is pretty well aerated.
Dud
?
?
Some pics at
start,? after an hour,? and then a few hours later.?
Rough side of
filter material facing up this time!?
|
This was with a filter I made by folding card stock in half and sandwiching a piece of Geo's filter roll inside.? I punched 1" holes with a gasket punch.? ?Note that I did not punch the two small holes near the top as I don't see anything in there that would even know they are there.?
I was thinking you could even just swap the actual filter material and reuse the paper card,? but it's possible for that to get contaminated.? ?I didn't measure the size of the opening in the sensor head.?
On Fri, Jul 1, 2022, 1:47 PM Dude < dfemer@...> wrote:
Shape looks good . what
filters are you using? The HQ FP5211-47 and the FPAE-47 give a filter error and
restricted flow. From a GAST vac pump. (26lpm) The PTFE5u work ok (30lpm) in
the metal carrier. But shows a filter error due to the carrier without 2 dot
holes.. I'll send pictures later.
Dud
?
?
?
I suppose so!? Like I said, the exhaust fan was on, so it would be
pulling some air through leaks.? How do you feel about the spectrum shape
now?? If you let me know soon enough, I could maybe knock out a few filter
cards for you today but I have a lot of prep to do for driving west tomorrow.
?
On Fri, Jul 1, 2022 at 10:35 AM Dude <dfemer@...>
wrote:
Nick,
With only 0.2 pCi/L after 4.3 hrs says you don’t have much of a
Radon problem or that mancave is pretty well aerated.
Dud
?
?
Some pics at
start,? after an hour,? and then a few hours later.?
Rough side of
filter material facing up this time!?
|
Nick where is the Po212 at
8.78 MeV coming from?
It will be useful when we
post data to give all the parameters of that run. The spectra is really says
nothing without knowing the peak count, count time and volume sampled, so label
those files with respect to the Radon counts. Sample time is flow rate (l/min)
divided by 1000* M^3 volume.
When comparing filters we
need to run in the same Rn concentration and for the same flow rate and time.
I’ll post the PTFE filter
data after a couple of hours.
Dud
?
?
This was with a filter I made by folding card stock in half and
sandwiching a piece of Geo's filter roll inside.? I punched 1" holes
with a gasket punch.? ?Note that I did not punch the two small holes
near the top as I don't see anything in there that would even know they are
there.?
I was thinking you could even just swap the actual filter material and
reuse the paper card,? but it's possible for that to get
contaminated.? ?I didn't measure the size of the opening in the
sensor head.?
?
toggle quoted message
Show quoted text
On Fri, Jul 1, 2022, 1:47 PM Dude <dfemer@...>
wrote:
Shape looks good . what filters are you using? The HQ FP5211-47
and the FPAE-47 give a filter error and restricted flow. From a GAST vac pump.
(26lpm) The PTFE5u work ok (30lpm) in the metal carrier. But shows a filter
error due to the carrier without 2 dot holes.. I'll send pictures later.
Dud
?
?
?
I suppose
so!? Like I said, the exhaust fan was on, so it would be pulling some air
through leaks.? How do you feel about the spectrum shape now?? If you
let me know soon enough, I could maybe knock out a few filter cards for you
today but I have a lot of prep to do for driving west tomorrow.
?
On Fri, Jul 1,
2022 at 10:35 AM Dude <dfemer@...>
wrote:
Nick,
With only 0.2 pCi/L after 4.3 hrs says you don’t have much of a
Radon problem or that mancave is pretty well aerated.
Dud
?
?
Some pics at
start,? after an hour,? and then a few hours later.?
Rough side of filter
material facing up this time!?
|
No idea.? There are some mixed mineral samples,? trinitite, lantern mantles,? radium bridge markers, couple big F3 smoke detectors etc in a couple boxes back in the corner.? And about 800# of remelted lead from recovered bullets sitting on the floor.?
I tried to take pictures at beginning and end for getting accurate run time,? and it does report the volume of flow over the run period.?
Definitely agree on getting a straight up comparison.? That's part of why I figured you might want to have a few of these to try.?
On Fri, Jul 1, 2022, 3:50 PM Dude < dfemer@...> wrote:
Nick where is the Po212 at
8.78 MeV coming from?
It will be useful when we
post data to give all the parameters of that run. The spectra is really says
nothing without knowing the peak count, count time and volume sampled, so label
those files with respect to the Radon counts. Sample time is flow rate (l/min)
divided by 1000* M^3 volume.
When comparing filters we
need to run in the same Rn concentration and for the same flow rate and time.
I’ll post the PTFE filter
data after a couple of hours.
Dud
?
?
This was with a filter I made by folding card stock in half and
sandwiching a piece of Geo's filter roll inside.? I punched 1" holes
with a gasket punch.? ?Note that I did not punch the two small holes
near the top as I don't see anything in there that would even know they are
there.?
I was thinking you could even just swap the actual filter material and
reuse the paper card,? but it's possible for that to get
contaminated.? ?I didn't measure the size of the opening in the
sensor head.?
?
On Fri, Jul 1, 2022, 1:47 PM Dude <dfemer@...>
wrote:
Shape looks good . what filters are you using? The HQ FP5211-47
and the FPAE-47 give a filter error and restricted flow. From a GAST vac pump.
(26lpm) The PTFE5u work ok (30lpm) in the metal carrier. But shows a filter
error due to the carrier without 2 dot holes.. I'll send pictures later.
Dud
?
?
?
I suppose
so!? Like I said, the exhaust fan was on, so it would be pulling some air
through leaks.? How do you feel about the spectrum shape now?? If you
let me know soon enough, I could maybe knock out a few filter cards for you
today but I have a lot of prep to do for driving west tomorrow.
?
On Fri, Jul 1,
2022 at 10:35 AM Dude <dfemer@...>
wrote:
Nick,
With only 0.2 pCi/L after 4.3 hrs says you don’t have much of a
Radon problem or that mancave is pretty well aerated.
Dud
?
?
Some pics at
start,? after an hour,? and then a few hours later.?
Rough side of filter
material facing up this time!?
|
Nick Andrews
