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Type of radiation and shielding: Uranium and its decay elements emit Alpha particles, Beta particles and Gamma rays. Paper, skin and a few centimeters of air stop Alpha particles. Thin layers of plastic, metal or even a small block of wood will stop Beta particles. Nothing totally stops Gamma rays, however lead and concrete will attenuate it. 

Radiation exposure: Exposure to radiation from Uranium is a function of Amount (size and radioactivity of the sample), Exposure Time, Shielding and Distance (exposure drops off by the inverse square law: if the radiation exposure is 100 mR/hr at 1 inch from a source, the exposure will be 0.01 mR/hr at 100 inches). Uranium ores emit a small amount of Radon gas. It is best to keep samples in a well-ventilated area such as in the garage, outside, or in an air-tight container. 

Storage and protective gear: Minimize the time you are in contact with radioactive specimens, maximize your distance from where the samples are stored, and if you acquire a large amount, consider storing in a lead-lined box. Wear disposable gloves while handling, clean up the work area and wash hands after handling. Do not eat or drink around the samples, or otherwise ingest any dust from the samples. Keep out of the reach of children and pets. If you follow these simple rules, you can enjoy this incredible element called Uranium.