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[aprssig] APRS Radiation sensor

Guido Trentalancia iz6rdb at trentalancia.com
Tue Mar 22 23:06:18 UTC 2011


Hi Bob,

glad we finally get this working !

The bottom of the scale (2 nSv/h) is probably undetectable. The top of
the scale should be fine up to Level 7 of Internation Nuclear and
Radiological Event Scale (IAEA) *outside* of a reactor (Chernobyl core
was up to 300Sv/h immediately after the 1986 accident).

If anyone has some sort of "clever" software then an automatic alert
(APRS bulletins, email, SMS) could be triggered for the Level 2 range
(steadily above 0.1 mSv/h).

73,

Guido IZ6RDB

On Tue, 2011-03-22 at 15:27 -0400, Bob Bruninga wrote:
> How about this for Radiation Telemetry:
> 
> - 3 digits.  Either in a WX report or in a Telemetry channel.
> - In a weather report the identifying byte would be "X".
> - So X123 would be 12 times 10^3rd nanoseverts
> 
> Using Tapio's idea (below) of 2 digits of precision and one digit of decade.
> 
> Bob, WB4APR
> 
> -----Original Message-----
> From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On Behalf
> Of Tapio Sokura
> Sent: Thursday, March 17, 2011 4:40 PM
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] Clarification of APRS weather station data flow.
> 
> Hi,
> 
> On 03/17/2011 05:29 AM, Scott Miller wrote:
> > Also, unsurprisingly, there's been a big surge of interest in Geiger
> > counter interfacing.  Bob, can we get a standard for sending ionizing
> > radiation levels in weather reports?
> 
> I'm not Bob, but I'm sticking my spoon into the soup anyway after a
> little IRC chatting.. so here goes: Anyone who's familiar with radiation
> levels knows they can hugely vary in scale. So using a plain, say
> three-digit, number isn't going to scale very well (i.e. 001 = 1 uSv/h,
> 999 = 999 uSv/h).
> 
> I'm suggesting the following: three digits, where the first two are the
> significant digits (mantissa) and the last one is an exponent. Base unit
> could be nSv/h, nanosieverts per hour (Sievert is the SI-unit for
> ionizing radiation dose equivalent).
> 
> If abc represents the digits, the resulting radiation level would be
> calculated using the formula ab * 10^c nSv/h. A few examples:
> 
> 000 = special case for "reading unavailable"
> 010 = special (theoretical) case of 1 nSv/h or under
> 020 = 2 nSv/h
> 150 = 15 nSv/h
> 990 = 99 nSv/h
> 321 = 320 nSv/h
> 123 = 12 uSv/h
> 654 = 650 uSv/h
> 456 = 45 mSv/h
> 987 = 980 mSv/h
> 989 = 98 Sv/h
> 999 = special case for 99 Sv/h or over
> 
> So that's the digit part sorted out, now we just need a letter
> identifier/tag for it..
> 
>    Tapio
> 
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