[time-nuts] How dangerous if Rb lamp broken?

Didier Juges shalimr9 at gmail.com
Wed Jul 10 19:34:24 UTC 2013


Hui, you may want to check this page:

http://wiki.answers.com/Q/What_is_the_relationship_between_sievert_and_becquerel

Your English is much better than my Chinese, you are doing great, don't be
embarrassed!

Didier


On Wed, Jul 10, 2013 at 8:53 AM, Hui Zhang <ba6it at 163.com> wrote:

> Hello Robert:
>
> I am a little confuse how exactly much Rb87 in a bulb? Some people say
> that it's couple millgram,  but you tell me it's half a millgram, which is
> ture?
>
> You message is good new to me, it let me relax, but I don’t understand
> Bq/gram unit, would you please convert it to mSV unit, I can know the how
> many mSV of human is safety by search by internet. I mean in extreme
> situration, if all Rb87 of buld sprinkled in my table, how many exposure
> value will I accepet in 24 Hour?
>
> I found some people (other electronics fan) wrote a formula about Rb87
> radioactivity calculation, that is:
>
> 1mg Rubidium * 27.835 * 0.27835 * 6.02 *10^23 /
> 87/4.88/10^10/2/365/24/3600*1=625.
>
> So, decay energy=0.283MeV, about 600 electron per second, Is this
> calculation correct?
>
>
>
> 27.835=Percent of Rb87
>
> 6.02*10^23 = Avogadro's constant
>
> 87= Atomic weight
>
> 4.88*10^10== Half time of Rb87 (Year)
>
> 2 = Rb87 decay to half
>
> 365 = day of year
>
> 24 = hour of day
>
> 3600 = second of hour
>
>
>
>   I am very glad to read many relay of my email, I want say thanks for
> everyone. As you said why people be afraid of Rb87 but not other things, I
> think maybe because we don’t understand it. Such as, I don’t afraid of RF
> exposure, because I know it, I am a HAM and learned many RF exposure
> knowledge, but of atom and radioactivity, I have only poor knowledge.
>
>
>
>   Thanks everyone again, this is amazing mail-list. Say sorry for my poor
> English.
>
>
>
> Hui
>
>
>
>
> At 2013-07-09 19:40:50,"Robert Atkinson" <robert8rpi at yahoo.co.uk> wrote:
> >Hi Hui,
> >Most bulbs use a mix of Rb87 and Rb85 with an activity of around 1500
> Bq/gram with less than half a millgram in a typical bulb, that's less than
> a Bq per bulb (about 20 picocuries). You will get more ardiation from using
> low sodium salt (potassium chloride) on your food. Potasium is essential
> for life and Rb is chemically similar.
> >In short don't worry.
> >Robert G8RPI (also a geiger "nut" and collector of radioactive material)
> >
> >
> >________________________________
> >From: Hui Zhang <ba6it at 163.com>
> >To: Discussion of precise time and frequency measurement <
> time-nuts at febo.com>
> >Sent: Tuesday, 9 July 2013, 5:07
> >Subject: [time-nuts] How dangerous if Rb lamp broken?
> >
> >
> >Dear Group:
> >    I have four compact Rb Stanard, but I am worried about what if my Rb
> lamp broken in accident someday? How dangerous of this situration? Is Rb87
> came out from Rb lamp will be a disaster? You know I haven't any beta rays
> detect instrument.
> >
> >
> >Hui
> >_______________________________________________
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