Filed Pursuant to Rule
424(b)(3) of the
Securities Act of 1933
Registration No. 333-19199
SUPPLEMENT DATED MARCH 26, 1997 TO PROSPECTUS
Dated February 21, 1997 of
Thermedics Detection Inc.
The Rights distributed in connection with the Rights
Offering of Thermedics Detection Inc. expired at 5:00 p.m. on
Wednesday, March 19, 1997. Each Rights holder was permitted to
deliver to the Subscription Agent Rights exercised pursuant to a
duly completed Notice of Guaranteed Delivery until such date and
time. The Company issued 2,275,080 shares of Common Stock
pursuant to the exercise of Rights, including 1,230,788 shares
pursuant to the exercise of Rights by the Underwriters. The
Rights exercised by the Underwriters were acquired from third
parties through open market transactions and private purchases at
prevailing market prices ranging from $0.125 to $0.50. Although
the Underwriters were not required to purchase any shares of
Common Stock pursuant to the Standby Underwriting Agreement, the
Underwriters acquired an additional 396,212 shares of Common
Stock on March 26, 1997 pursuant to the purchase of the Firm
Shares (which includes the purchase of 96,212 Shares pursuant to
the exercise of the over-allotment option relating to the Firm
Shares). The shares of Common Stock acquired by the Underwriters
upon the exercise of Rights and pursuant to the purchase of the
Firm Shares and the exercise of the over-allotment option
relating thereto have been, or will be, reoffered to the public
at prevailing market prices.
