Helium study 4 by Ian Wallman. (IMAGE) University of Oxford Caption Equipment in the Ballentine Laboratory used for the measurement of helium isotopes in geological samples. Credit: Ian Wallman. Credit Equipment in the Ballentine Laboratory used for the measurement of helium isotopes in geological samples. Credit: Ian Wallman. Usage Restrictions The image can be used if the credit is included. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.