Summary of Expected Count Rates for MIPS as a Function of Target Brightness
===========================================================================

Point-Source Count Rates:
=========================
Use the band-integrated response from MIPS chapter of SOM, table 8.2
(note that old label, 'Peak Response', was wrong, and the values are in
fact band integrated response...)  and the nominal gain values of 5.1
at 24um, and 7.1 for Ge.

	24um Response:	420 e/s/mJy/px		Gain:	 5.1 e-/DN
	70um Response:	140 e/s/mJy/px		Gain:	 7.1 e-/DN
	160um Response:	 80 e/s/mJy/px		Gain:	 7.1 e-/DN

At 24 and 160 um the flux falling on the pixel at the peak of the PSF
is about 1/10 of the total flux from a source.  The PSF sampling factor
at 24 um is 0.27"/um * 24um / 2.55 "/pxl = 2.54 pxl/FWHM. The same
calculation at all pixel scales/bands gives:

	band	PSF(")	"/pxl	SampFac	tot/peak*
	----------------------------------------
	24	6.48	2.55	2.54	10
	70WF	18.9	9.84	1.92	5.7
	70NF	18.9	4.99	3.78	22. 
	160	43.2	16.0	2.70	11. 
	* 70 and 160 values scaled to assumed value of 10 at 24um

From this we can calculate the peak and total count rates for a 1Jy source:

                ---------------- 1 Jy Source Count Rates ------------------
	band	peak (e-/s)	peak (DN/s)	tot. (e-/s)	tot. (DN/s)
	--------------------------------------------------------------------
	24	4.2e4		8.4e3		4.2e5		8.4e4
	70WF	2.6e4		3.5e3		1.4e5		2.1e4
	70NF	6.4e3		 900		1.4e5		2.1e4
	160	7.3e3		1.0e3		8.0e4		1.1e4

Point-Source Saturation Limits:
===============================
The peak count rates can be used to estimate the brightness of sources that
will saturate in the core of the PSF in 1 second. At 70 and 160 that is dicey
because the responsivity changes over time, and a source that would not
saturate immediately after an anneal could saturate some time later. I'll
just estimate the saturation limit right after an anneal and worry about
responsivity drifts later. 

                          Point-Source Saturation Limits
		1Jy source	Saturation	Saturates in	Advertised
	band	peak (DN/s)	Limit (DN)	 1 sec (Jy)	Limit (Jy)
        --------------------------------------------------------------------
	24	8.4e3		6.0e4		7.2 		5.6
	70WF	3.5e3		6.5e4		19  		5.3
	70NF	 900		6.5e4		67  		20.
	160	1.0e3		6.0e4		60		8