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Entry time:	Wed Sep 2 14:06:54 2026
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<p> <table width="98%" align="center" cellspacing="1" style="border:1px solid #486090;"> <tbody> <tr> <td cellpadding="3px" style="background-color:#486090; font-weidht:bold; color:white;">Quote:</td></tr> <tr> <td cellpadding="10px" style="background-color:#FFFFB0;"><p>We've made the calculates of the current rate of decay and the Sievert (impact of radiation for humans) for a Strontium source<br /> The calculates are mentioned right below:<br /> <br /> Once it was new, the source's information was:<br /> Type: Sr90<br /> Decay tax: 0.1<span id="hotword"><span id="hotword" class="hwc" name="hotword">μCi</span></span> (Curie)<br /> The Half-life: 28.8y<br /> <br /> We did the conversion of units (from Ci to Bq):<br /> 1Bq = 27pCi<br /> 0.1<span id="hotword"><span id="hotword" class="hwc" name="hotword">μCi = 3.710³ Bq</span></span><span id="hotword"><span id="hotword" class="hwc" name="hotword"><br /> </span></span></p> <p>The Strontium source had a disintegration tax of 3.710³Bq, and nowadays it has a 2.210³Bq tax:<br /> Using the exponential decay tax's equation:<br /> <br /> N(t)=N(0)e^-(t / τ) -----> N=Disintegration tax (Bq);   t= Elapsed time;   τ= Half-life time.</p> <p>N(t)=3.710³ e^-(14.6 / 28.6) = 2.210³(Bq)</p> <p><br /> The Strontium's irradiation risk is 2847mSv/Year, considering the human tissue at 1cm.<br /> <br /> That irradiation risk<strong> IS NOT</strong> safe, comparing to the annual dose limit at CERN, which is 500mSv/year.<br /> The calculates:<br /> Using a compost rule of three we have:<br /> <br /> 37MBq              ----  1cm ----      1MeV     ---- 10⁴mSv/h</p> <p>2.2 10⁽⁻³⁾MBq ---- 1cm ---- 0.546MeV  ---- X mSv/h<br /> <br /> X= 220.546/37 = 0.325mSv/h = 2847mSv/y.</p></td> </tr> </tbody> </table> </p><p> </p> Encoding*: HTML ELCode plain Suppress Email notification

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