Table 1 Filtration efficiency of KN95 and N95-3M masks before and after gamma radiation dose of 0–15 kGy.

From: Effect of gamma irradiation on filtering facepiece respirators and SARS-CoV-2 detection

Dose (kGy)

KN95

N95-3M

Typical dose rate

Low dose rate

Typical dose rate

Low dose rate

FE average*

P value

FE average*

P value

FE average*

P value

FE average*

P value

0

100.0

 

99.9

 

89.8

 

88.1

 

0.5

95.4

0.999

95.9

0.955

83.8

0.995

81.8

 < 0.001

1

94.9

0.943

95.7

0.955

83.8

0.868

81.2

 < 0.001

2

95.2

0.890

95.7

0.687

83.7

0.868

80.3

 < 0.001

3

94.0

0.066

93.7

0.270

83.4

0.133

79.9

 < 0.001

4

93.1

0.030

93.6

0.012

82.9

0.025

79.5

 < 0.001

5

92.8

0.003

93.5

0.007

82.6

0.017

78.6

 < 0.001

7.5

93.2

0.13

93.3

 < 0.001

81.2

 < 0.001

77.5

 < 0.001

15

91.6

 < 0.001

92.6

 < 0.001

78.0

 < 0.001

77.0

 < 0.001

  1. *The FE average is either a mean FE value if FE variables at all particle sizes (0.3–5 µm) passed the normality test or a median FE value if FE variables failed the normality test.
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