<p>Caesium-137 is not used in the fracking process.</p>

<p><strong>Caesium-137</strong> is used as a source of gamma-rays in some logging tools, most notably <a href="https://en.wikipedia.org/wiki/Density_logging">the density tool</a> (<a href="http://www.halliburton.com/public/lp/contents/Data_Sheets/web/I_through_Z/L&amp;P14_01.asp">one example</a>), and some other instruments such as flowmeters. This is what the story you linked to is about. Logging tools are used after drilling to measure the properties of the rocks in the borehole, and thereby calibrate geological models of the subsurface. These sources are valuable, and should be secured and only handled by trained engineers. The caesium is completely enclosed in the tool, and none is left in the subsurface, unless something goes badly wrong with the logging process and a tool is lost.</p>

<p><strong>Caesium-133</strong>, the naturally-occurring non-radioactive isotope of caesium, is sometimes used in drilling and fracking fluids in the form of caesium formate brine. Its high density (ca. 2300 kg/m³) improves drilling efficiency and rig safety, and assists with pressure build-up for induced fracturing. It's still pretty valuable stuff, so companies often rent it, retrieving as much as possible (5–15% losses are common, however) and paying only for what they use. <a href="http://www.formatebrines.com/">Cabot</a> is one vendor of such brines. </p>

CC BY-SA 3.0
2014-04-19T00:46:12.663Z
Hey, thanks for clarifying that. Do you have any sources, especially for the first paragraph? The linked article doesn't mention caesium-137.
naught101
CC BY-SA 3.0
2014-04-19T01:15:36.923Z
@naught101: Good idea, I added one.
Matt Hall
CC BY-SA 3.0
2014-04-18T14:39:34.590Z
2014-04-19T01:13:51.453Z
2014-04-19T01:13:51.453Z
Matt Hall
<p>Caesium-137 is <a href="http://www.northerndailyleader.com.au/story/2223585/santos-issued-please-explain-over-radioactive-material-in-pilliga/?cs=159">used in the fracking process</a>. What is it used for?</p>

<gas><resources><drilling><fracking>
What is caesium-137 used for in fracking?
naught101
# What is caesium-137 used for in fracking?

(Asked by: username_0 on 2014-04-18)

Caesium-137 is [used in the fracking process](http://www.northerndailyleader.com.au/story/2223585/santos-issued-please-explain-over-radioactive-material-in-pilliga/?cs=159). What is it used for?

**Tags:** gas, resources, drilling, fracking


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## 1 answers

### Answer by username_1 on 2014-04-18. Score: 16 | Accepted answer

Caesium-137 is not used in the fracking process.

**Caesium-137** is used as a source of gamma-rays in some logging tools, most notably [the density tool](https://en.wikipedia.org/wiki/Density_logging) ([one example](http://www.halliburton.com/public/lp/contents/Data_Sheets/web/I_through_Z/L&P14_01.asp)), and some other instruments such as flowmeters. This is what the story you linked to is about. Logging tools are used after drilling to measure the properties of the rocks in the borehole, and thereby calibrate geological models of the subsurface. These sources are valuable, and should be secured and only handled by trained engineers. The caesium is completely enclosed in the tool, and none is left in the subsurface, unless something goes badly wrong with the logging process and a tool is lost.

**Caesium-133**, the naturally-occurring non-radioactive isotope of caesium, is sometimes used in drilling and fracking fluids in the form of caesium formate brine. Its high density (ca. 2300 kg/m³) improves drilling efficiency and rig safety, and assists with pressure build-up for induced fracturing. It's still pretty valuable stuff, so companies often rent it, retrieving as much as possible (5–15% losses are common, however) and paying only for what they use. [Cabot](http://www.formatebrines.com/) is one vendor of such brines.

> **Comments:**
> **username_0**: Hey, thanks for clarifying that. Do you have any sources, especially for the first paragraph? The linked article doesn't mention caesium-137.  
> **username_1**: @username_0: Good idea, I added one.  

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