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Naturally radioactive nuclei can decay spontaneously by emitting the following particles:
Humeroscapular
Pertaining to the humerus (upper arm bone) and the scapula (shoulder blade), often related to the shoulder joint.
Atlantoaxial
Pertaining to the joint between the atlas (C1 vertebra) and the axis (C2 vertebra) that allows for the rotation of the head.
Cartilaginous Joints
Joints where the bones are attached by cartilage, allowing for more movement than fibrous joints but less movement than synovial joints.
Hyaline Cartilage
A translucent, bluish-white type of cartilage present in the joints, respiratory tract, and other sites, providing a smooth surface for joint movement as well as support and flexibility.
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