N.J. Admin. Code § 7:18-6.4

Current through Register Vol. 56, No. 24, December 18, 2024

Section 7:18-6.4 - Required use of DSAMs

(a) In performing radiochemical analysis of a regulatory sample (including, without limitation, analysis of a PT sample by a laboratory that is applying to become certified), a laboratory shall use only:

1. A DSAM from the applicable Category listed in N.J.A.C. 7:18-6.1(a) for which the laboratory is certified;

2. An applicable ATP approved by the Department pursuant to N.J.A.C. 7:18-2.20 for the laboratory and, if applicable, for the facility in question; or

3. USEPA Method 900, Gross Alpha and Beta Radioactivity in Drinking Water, for gross alpha testing in screening for the presence of all regulated alpha emitting radionuclides modified as follows:

i. A Thorium-230 standard shall be used as the test calibration standard;

ii. The initial counting of the plancheted sample shall be initiated no sooner than 36 hours from sample collection and shall be completed within 48 hours from the time of sample collection;

iii. If the calculated value from the initial gross alpha count is less than or equal to five pCi/L, that value shall be reported and no further radiochemical analysis of the sample is required; and

iv. If the gross alpha value from the initial count exceeds five pCi/L, a second counting of the same prepared sample is required. The same plancheted sample shall be recounted between 20 to 28 hours after the midpoint of the initial counting timeframe; and this calculated value shall be reported as the final gross alpha result.

(b) The requirements of (a) above do not apply to the analysis of a non-regulatory sample, if the requirements of N.J.A.C. 7:18-2.22(b) are satisfied.

N.J. Admin. Code § 7:18-6.4

Amended by 47 N.J.R. 782(a), effective 4/20/2015.

Amended by 50 N.J.R. 1939(a), effective 9/4/2018