A radiation detector is placed in front of a long-lived gamma-emitting source. The count-rate is measured and recorded every 5 minutes. The results are shown below:
415 s−1,398 s−1,407 s−1,421 s−1,392 s−1 415\text{ s}^{-1}, \quad 398\text{ s}^{-1}, \quad 407\text{ s}^{-1}, \quad 421\text{ s}^{-1}, \quad 392\text{ s}^{-1} 415 s−1,398 s−1,407 s−1,421 s−1,392 s−1What term can be used to describe the nature of the fluctuations in the data shown?
exponential
linear
random
spontaneous
