Application of the ATP assay to rapidly assess cleanliness of spacecraft surfaces: a path to set a standard for future missions

AMB Express

Table 1 Spacecraft surface characteristics sampled during this study

Spacecraft surface	Sample location	Final accountable sample	Zone name	Date	Spacecraft surface sampled	Number of samples tested for NSA	Number of samples tested for ATP
Flight samples
Backshell and balance mass device	KSC	Y	Backshell	6/6/11	15	10	10
Spacecraft stack	KSC	Y	Backshell	9/20/11	38	4	9
Spacecraft stack prior to encapsulation	KSC	Y	Backshell	10/8/11	16	6	2
Descent pre-closeout	KSC	Y	Descent stage	8/12/11	37	94	32
Spacecraft stack	KSC	Y	Descent stage	9/16/11	72	41	62
Descent stage electronics	JPL	Y	Descent Stage	4/5/11	7	6	6
Spacecraft stack prior to encapsulation	KSC	Y	Heatshield	10/8/11	21	6	21
Rover pre-closeout	KSC	Y	Rover	8/10/11	53	31	34
Spacecraft stack	KSC	Y	Rover	9/20/11	70	54	55
Spacecraft stack prior to encapsulation	KSC	Y	Rover	10/8/11	23	20	18
Non-flight samples
Descent stage	JPL	N	Descent stage	3/7/08	20	20	20
Rover interior	JPL	N	Rover	5/20/08	18	18	18
Launch vehicle isolation diaphragm	KSC	N	Non-flight	10/27/11	10	10	10
Total number of samples analyzed for accountable flight assays					400	320	297