Re: GM Counters in High Backgrounds

[Kurt <kurtd@locomp.net>]

One would think the smear would read 500cpm/scan. As we know, the higher the
scale used, the less accurate the reading. (usually low) The same smear counted
in an area of 50cpm/probe area background would read close to 750cpm/scan. I
have seen them get as far as 1000cpm/probe area. Remember this. Each scale is
calibrated independently. Reading will be different right of the getty go. As
far as your debate, always think in the conservative direction.

                                Kurt Dahl
                                Clinton Power Station
                                http://go.to/kurt-dahl

"Pollan, Paul B." wrote:

> I am working to settle a debate among the masses (Utility and Contract HP
> Technicians):
>
> Scenario:  Eberline E-140 with an HP-210 probe set up in a shielded
> configuration in lower levels of a PWR Containment during           Outage.
> The meter/probe combination is 10% efficient. The background is still
> 1000cpm/probe area.
>
> Question:  If a disk smear with a 100cm2 smeared area reads 1500cpm/scan in
> the shielded configuration as mentioned above,      what would the smear
> actually read if the smear was moved to a low background area (e.g., 50cpm
> background) and             counted with the same type of instrument/probe
> setup?
>
>
>
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