1. However, many of their daughter products are strong gamma emitters . 2. A survey over a couple of decades ago apparently ruled out gamma emitters . 3. The isotope is also of a very low energy level for a gamma emitter . 4. They checked for different radioactive substances including gamma emitters , plutonium, americium and strontium. 5. This is commonly done by measurement of the gamma emitter ) of the sample material. 6. It is a potent gamma emitter . 7. The release of the beta / gamma emitters such as caesium-137 has been far greater. 8. For gamma emitters either an ionization chamber, a gamma spectrometer or an energy compensated GM tube are required. 9. Its ~ 140 keV of energy make it safer for use because of the substantially reduced ionization compared with other gamma emitters . 10. In March 1982, designers began working on a W80 variant intended for the Navy's gamma emitter in addition to being a high spontaneous fission isotope.