The Reston Groundwater Dating Laboratory

Notice from the Reston Groundwater Dating Laboratory

November 7, 2011

Effective November 1, 2011, a new contract for tritium/helium-3 dating and noble gas analysis was issued by the USGS National Acquisition Branch to The Trustees of Columbia University, NY.  The samples will be analyzed at the Noble Gas Laboratory, Lamont-Doherty Earth Observatory, Palisades, NY.  The contract provides the following analytical services:

 Analysis 1

Analysis 2

Analysis 3

The delivery schedule is as follows:
Pricing information is available through the pricing links on the USGS intranet only

Analysis

Measurement*

Reporting unit

Analytical Precision

Turn-around time (maximum months)

Former  schedule or lab code number

1

Helium, Neon, 3He/4He

He, and Ne: ccSTPg-1 water; 3He/4He of total dissolved He as δ3He (in %)

He, 1%; Ne, 2%; δ3He, 1%

4

Schedule 1033

2

Helium, Neon, Argon, Krypton, Xenon, 3He/4He

He, Ne, Ar, Kr, Xe: ccSTPg-1 water; 3He/4He of total dissolved He as δ3He (in %)

He, Ar, Kr, 1%; Ne, Xe, 2%; δ3He, 1%

4

New

3

Tritium

TU

(3-10 TU) 5%;(1-3 TU) 10%;  (0.3-1.0 TU) 30%;  (0.1-0.3 TU) 100%

6

Lab Code 2112

1 and 3

Helium, Neon, 3He/4He with tritium by 3He ingrowth

see above

see above

6

Schedule 1033 and Lab Code 2112

2 and 3

Helium, Neon, Argon, Krypton, Xenon, 3He/4He with tritium by 3He ingrowth

see above

see above

6

New

* Mass spectrometric

 

 

 

The new contract permits analysis of the full suite of noble gases.  The results include age interpretation. Information on requesting sample containers, collection procedures and submittal to the Contract Lab is provided at http://water.usgs/gov/lab/3h3he.  Please contact Julian Wayland cfc@usgs.gov, 703-648-5847), or Melissa Schomody mlschom@usgs.gov, 703-648-5833) if you have further questions