The results suggests that ¹³⁷C is more radioactive and decays faster than ¹⁴C. Also ¹³⁷C penetrates more than ¹⁴C because it has both beta and gamma particle unlike ¹⁴C which has only a beta particle. Gamma particle passes to any kind of material be it fiber glass or metal unlike a beta particle, it cannot pass through these materials.
