Our radon anomalies are repeatable.|
RADON AND THORON IN SOIL GAS
In my work in the Karoo of Madagascar
(click here for details)
I found that the radon-thoron anomalies were confirmed on different days.
A big advantage of our system is that results are available in five minutes.
When you get an anomalous reading you immediately close in the spacing and get extra readings in each direction.
The decision to close in the spacing and resample is made in real time by the operator at the sample site.
RADON IN SURFACE WATER
A radon anomaly in the water of Midwest Lake, associated with the orebody,
was confirmed in three different summers by three different operators
(click here for map).
In my thesis work at Bancroft I studied sampling error in detail, both in space and time, and for lakes and streams.
I sampled a number of points, anomalous and background, twice, a month apart,
and at a number of points I collected two samples about 10 feet apart.
Also, I sampled a lake and a stream, both anomalous, several times over the course of summer.
In all cases the variation was at an acceptable level and anomalies were clearly distinct from background.
First, in 1969, Bondar-Clegg carried out a water survey by aircraft at a spacing of one sample per square mile.
This survey included only one sample near the orebody and it ran 19 pCi/L in radon,
which they identified as "probably anomalous". This sample was not anomalous in uranium.
Documentation of this survey should be in the Saskatchewan assessment files.
Second, in 1972, I sampled the southwest arm of the lake in more detail, confirming the anomaly.
It does not matter that my high values were much higher than Bondar-Clegg's: the anomaly stood out from background.
Also, my samples were collected by canoe close to shore and Bondar-Clegg's by aircraft from deeper water.
Third, 1n 1977, another more detailed survey confirmed the anomaly again. I have lost the reference to this last survey.
We measure: radon - radium - thoron - radon daughters - alpha radiation.
is recognized as the most sensitive and reliable method for these elements.
Intrinsically safe functions.
Sensitive to geochemical trace levels necessary for radon in lake water and for radon-thoron isotope ratios.
- immune to beta and gamma radiation.
- one monitor works with a number of (less expensive) detectors.
Our instruments are used around the world in exploration for uranium, oil & gas, groundwater and hydrothermal,
and in environmental protection, health physics, earthquake prediction,
and evaluation of hydrocarbon and NAPL contamination etc.
Same instruments used for radon and radium in soil, sediment,
plant parts, rocks, water, soil gas, air, snow, food, and for radon and thoron daughters in air.
Winter and summer, from the Sahara Desert to the Canadian Shield, our instruments have faced up to severe field conditions.
In the radon business since 1968, our instruments are updated regularly with the most recent major re-design in 2015.
Modern, low-power, field-rugged electronics. Some earlier versions still working after 40 years.
Continuous real-time monitoring and data recording.
RS232 port/pc software.
- User programmable measurement intervals, sample and count periods and alarm level settings.
Can work in a tent without electricity or be carried from point to point in the field.
50 readings per day. Results available immediately.
Portable. Rechargeable battery pack good for a long day in the field and recharges in a few hours.
Can be operated by junior personnel if carefully supervised.
EPA and CE Mark compliant.
Click here (www.finderschoice.com/rn) for more details of our radon instruments,
and for other instruments, components and accessories we provide.
Technical specification sheets and pictures of our instruments provided on request.
Multilingual consulting and training (if required).
Robert H. Morse, Ph.D., P.Eng.