This product is ideal to show the exponential decay of protactinium-234, a grand-daughter of uranium. It has a half-life of just 70 seconds, which gives students the chance to measure and analyse the decay in a single lesson. The generator is completely sealed in a leak proof enclosure and consists of Uranyl Nitrate and an Organic Solvent. These separate into two distinct layers but when shaken together react and produce a short term burst of Beta radiation. This can be measured using a rate meter.