New Jersey Administrative Code
Title 7 - ENVIRONMENTAL PROTECTION
Chapter 18 - REGULATIONS GOVERNING THE CERTIFICATION OF LABORATORIES AND ENVIRONMENTAL MEASUREMENTS
Subchapter 6 - RADIOCHEMICAL TESTING PROCEDURES INCLUDING RADON GAS/RADON PROGENY
Section 7:18-6.4 - Required use of DSAMs
Universal Citation: NJ Admin Code 7:18-6.4
Current through Register Vol. 56, No. 18, September 16, 2024
(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
7:18-6.1(a) for which
the laboratory is certified;
2. An
applicable ATP approved by the Department pursuant to
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 7:18-2.22(b) are satisfied.
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