It may be difficult to tell exactly from a print scan but this looks very grain free, with excellent IR rendition, very open shadows and very good shutter speed for a R72.
Thanks pentaxuser. The print is 10x8 inches. My standard print size is now 14x11 inches but this print is to be mailed to a friend. I changed developers from Tmax to Xtol before finally settling on D76 for IR. Tmax was quite grainy, Xtol tended to block up highlights but was grain free. I prefer the D76 rendition which is still quite grain free but delivers very nice tonality. The sun was blazing hot that day.