1- Both only emit low level alpha particles and you could hold it in your hand all day with no harm.
2- alpha particles are large, similar in size and structure to a helium atom; containing two neutrons and two protons.
3- For alpha particles, special techniques must be applied to obtain the required thin sample sources.
4- On Counting the alpha particles by Scintillation and on the Size of the Electrical Elementary Quantum (in German).
5- And, although other health risks may exist, cancer was used to evaluate the health risk from gross alpha particle contaminants.
6- The isomeric level was assigned spin and parity of 1/2-, decaying by emission of an 8722 KeV alpha particle with a half-life of 1.49s.
7- alpha particles travel short distances in air, of only 2-3 centimeters and cannot penetrate through a dead layer of skin on the human body.
8- Pu-240 exposed to alpha particles will incite a nuclear fission.
9- These particles continue to decay, emitting alpha particles which can damage cells in the lung tissue.
10- However, alpha particles are "bone seekers" due to Radium possessing a high affinity for Chloride ions.
11- Radium is readily absorbed into the body where it concentrates in the bone marrow and gives off very damaging alpha particles.
12- Type of radioactive disintegration (see radioactivity) in which some unstable atomic nuclei dissipate excess energy by spontaneously ejecting an alpha particle.
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