advice for buying potassium mag/gradiometer

Geophysical applications on environmental investigation, mineral prospecting, engineering, archaeology, forensics, hydrology...
Post Reply
Quark Scan Inc.
bushido
Member
Member
Posts: 9
Joined: Wed Apr 07, 2021 11:22 am

advice for buying potassium mag/gradiometer

Post by bushido »

greetings,
please i need advice before spending a lot of money buying a potassium magnetometer from Gemsys.
It's a professional instrument and i'm buying it in order to look for magnetic anomalies caused by buried metallic objects and voids in a depth going from 0 to 15 meters deep.
would this magnetometer be the best choice?
Quark Scan Inc. - underground utility locating and geophysical survey services in NJ NY and PA
99thpercentile
Platinum Member
Platinum Member
Posts: 102
Joined: Tue Aug 24, 2010 6:31 pm
Website: http://www.iscgeoscience.com
Linkedin: https://www.linkedin.com/in/ryanenorth/
Location: Evergreen, CO

Re: advice for buying potassium mag/gradiometer

Post by 99thpercentile »

Magnetometers are a very poor choice for void detection. The magnetic susceptibility of the air in the void is zero. The magnetic susceptibility of most soils is pretty low outside of tropical regions. So you would be looking for a very low contrast anomaly to start with. Generally, for most geophysical methods it is easier to detect anomalies at depth the are more magnetic or more electrically conductive, than those that are lower.

Magnetometers are passive instruments that detect ferrous metal targets at depth. They are also powerful tools for mapping geology, but that doesn’t sound like your application.

My general suggestion to most of these types of requests is to start with a frequency domain electromagnetic induction (FDEM) instrument like the Geonics EM31 or a competitor. These types of tools will let you detect a lot of different targets in the top 6 m (~20 ft), can collect a lot of data fairly quickly, and are pretty easy to interpret.
Last edited by 99thpercentile on Thu Apr 14, 2022 7:23 pm, edited 1 time in total.
Ryan E. North, PhD, RPG, GISP
Principal Geophysicist
ISC Geoscience
ryan.e.north@iscgeoscience.com
gmradar
Platinum Member
Platinum Member
Posts: 144
Joined: Thu Mar 29, 2012 5:27 pm

Re: advice for buying potassium mag/gradiometer

Post by gmradar »

I agree with Ryan above. Do not buy a Mag for voids. GPR are also a good choice for voids detection, depending on depth.
Symetrics Geophysics and NDT
Your reliable Geo Supplier
Shop :arrow: https://www.gmradar.com/shop.html#/
Website: www.symetrics-ndt.com
Post Reply
  • Similar Topics
    Replies
    Views
    Last post