Johnston Journal of Nuclear Energy Volume 19, Issue 7,  pp 527-539, 1965 Table 2
239Pu sample 2
TIME	BETA	ERR	GAMMA	ERR	TOTAL	ERR
(DAYS)	MICROWATTS	PERCENT	MICROWATTS	PERCENT	MICROWATTS	PERCENT
46	286	11	339	24	625	19
67	218	9	232	16	450	14
76	201	8	198	14	399	12
90	179	7	172	12	351	11
110	153	6	136	10	289	9
144	127	5	94	7	221	7