放射性核素

• 方(direction; square)PHONO-SEMANTIC
• 攵(hand holding striking stick; strike with a stick)RADICAL

Use a stick to chase and drive away in all directions to release and liberate.

• 身(body; self)ASSOCIATIVE
• 寸(inch; hand; grasp)PHONO-SEMANTIC

A hand (寸) raising the body (身) to shoot an arrow is the action of archery.

• 忄(heart; mind)RADICAL
• 生(be born; live)PHONO-SEMANTIC

Nature is something that is born together with the heart of each person.

• 木(tree; wood)RADICAL
• 亥(pig (12th zodiac sign))PHONETIC

The kernel of a tree fruit (木) sounds like the character for pig (亥).

• 糸(silk thread; filament)RADICAL
• 龶(coarse undyed thread bundle; top part of thread)ASSOCIATIVE

Raw silk that hasn't been dyed suggests the meaning of pure, simple, and basic.