Quantitative measurement of 219Rn radioactivity in exhaled breath from patients with bone metastasis of castration-resistant prostate cancer treated with 223RaCl2

EJNMMI Physics

Table 2 Summary of measurement results obtained using an α survey meter for N95 masks worn by medical staff

Administration dose of ²²³RaCl₂	Measured mask	Measured side	Measurement start time from administration	Observed count rate	²¹¹Bi radioactivity calculated based on count rate
3.9 MBq	a	Outside	40 min 7 s	8 cpm	0.8 Bq
	b	Outside	42 min 22 s	53 cpm	5.2 Bq
	b	Inside	49 min 16 s	0 cpm	0 Bq
	c	Outside	77 min 40 s	26 cpm	2.6 Bq
	c	Inside	80 min 0 s	0 cpm	0 Bq
3.0 MBq	d	Outside	7 min 0 s	0 cpm	0 Bq
	d	Inside	10 min 0 s	0 cpm	0 Bq
	f	Outside	24 min 48 s	80 cpm	7.9 Bq
	f	Inside	27 min 5 s	0 cpm	0 Bq