[ RadSafe ] Recommendations for data-logging ion chamber

John Jones john.p.jones at usu.edu
Sat Apr 23 11:03:57 CDT 2016


We've had a 9DP for about 3 years and can set it to record data every 
second. I don't recall seeing an option for continuous.

As long as a thumb drive is plugged into the unit, data is saved as it's 
turned off.

Settings are changed by connecting a somewhat simple keyboard to a USB plug 
on the instrument. I had to get a cheap keyboard from our surplus group 
because my old Microsoft ergonomic style is a little too complicated.

Some choices can be made about data and units. If it might help I can send 
a file to review.

Syncing the meter's internal clock with our watches is interesting, but 

We like ours because the -1 had a limitation we wanted to avoid. Shipping 
it back for calibration hasn't been a problem because we depressurize the 

John Jones
Radiation Safety
Utah State University
john.p.jones at usu.edu

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On April 22, 2016 6:07:55 PM Carl Willis <carl.willis at gmail.com> wrote:

> Hello RADSAFErs,
> I am looking for opinions on ion chamber instruments with the following
> criteria being especially relevant to my application:
> -Capable of logging data continuously, i.e. generating a doserate versus
> time record
> -Easy to clean, i.e. surface and operating controls easily decontaminated
> using soap/water
> -Chamber sealed, but not pressurized to HAZMAT levels
> -Capable of performing well in cool, high-humidity environments (mostly
> relates to how well the signal and chamber bias insulators are protected
> from ambient air)
> -Wide response range.  Ideally, I would like an instrument that can measure
> from single mR/hr to approximately 500 R/hr.  I think that's a tall order,
> but I'll throw it out in case there is an option someone knows about.
> -Backlit display that can be read in very poor light conditions
> In particular, the Ludlum 9DP-1 ticks most of these boxes, I think.  Is
> anyone familiar with its data logging functions? Can it be set to
> automatically log as I have described, or must the user signal it to log a
> point every time? Major downside of that instrument seems to be its battery
> (heavy, and consumed at an atrocious rate even with the backlight off).
> Does anyone know how it behaves in fields that exceed 50 R/hr?
> Thanks for any assistance.
> Best regards,
> Carl Willis
> 505-412-3277
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