Radon level in a Nigerian University Campus

BMC Research Notes

Table 2 Radon levels obtained from sampled offices in picocuries per liter (pCi/L)

Radon level/concentration(pCi/L)	Number of offices	%
≤2.7^a (permissible level)	59	95.1
>2.7^b (risky level)	2	3.2
≥4^c (critical threshold)	1	1.6
Total	62	100
Median	0.9 pCi/L

Minimum value: 0.0 pCi/L, maximum value: 5.3 pCi/L
^aPermissible level: this is the indoor level recommended by WHO as a standard for countries to adopt
^bRisky level: radon values at this level pose some degree of risk
^cCritical threshold: this is dangerous level in which immediate action must be taken. Also known as the ‘Action level’

ISSN: 1756-0500