Table IV.

Dose estimates obtained by each participating laboratory for samples Re6a, Re6b (2.7 Gy) on the basis of the yield of Giemsa stained excess PCC fragments/cell using the calibration curve for 24-hour repair period at 37°C constructed by Lab L1. Lab L6 used its own calibration curve.

Code	Dose Estimates for Re6
	10 cells		15–20 cells		30–40 cells
	Excess PCC fragments / cell	Dose (Gy)	Excess PCC fragments / cell	Dose (Gy)	Excess PCC fragments / cell	Dose (Gy)	Lab ID
Re6a	4.30	3.59	3.75	3.14	3.63	3.04	L1
	3.80	3.14	3.90	3.22	3.93	3.24	L2
	3.10	2.61	2.70	2.28	2.57	2.01	L3
	3.60	3.02	2.85	2.41	2.80*	2.37*	L4
	3.40	2.85	2.95	2.49	3.08	2.52	L5
	5.24	2.93	5.30	2.96	5.75	3.22	L6
	3.43	2.88	3.19	2.67	3.84	3.00	L7
	3.60	3.02	3.87	3.18	3.38	2.78	L8
	2.90	2.45	2.87	2.42	2.75	2.32	L9
	2.90	2.45	2.67	2.26	2.85	2.41	L10
Re6b	4.00	3.35	3.30	2.77	3.40	2.85	L1
	4.30	3.55	4.20	3.52	4.10	3.38	L2
	2.70	2.28	2.50	2.12	2.59	2.04	L3
	2.30	1.96	2.80	2.37	2.75*	2.01*	L4
	3.90	3.27	3.50	2.94	3.38	2.78	L5
	5.10	2.85	5.60	3.13	5.84	3.27	L6
	3.31	2.78	3.22	2.71	2.84	2.50	L7
	3.90	3.27	3.64	2.98	3.40	2.85	L8
	3.10	2.61	2.93	2.47	3.14	2.65	L9
	2.90	2.45	2.88	2.43	3.07	2.59	L10

^*Based on their own PCC preparations